* Permisable values for thread Class 3B#DescriptionValue (Inch)VValue (mm)D1Minor Diameter0.4459 - 0.453711.326 - 11.524D2Pitch Diameter0.4675 - 0.471411.875 - 11.974DMajor Diameter0.5000 (Min)12.7 (Min)αVaration of 30° anngle (+/-)1.1667°PVaration of Pitch (+/-)0.0011 (Ref)0.028 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection Tap Drill Sizes for 1/2 - 20 UNFIf not specified, assume a thread depth of 75%.You can learn more about thread depth in tapping here.To get the tap drill size in other depths, use our Tap Drill Size Calculator .Thread DepthTap Drill Size (Inch)Tap Drill Size (mm)55%0.46411.7960%0.46111.7165%0.45811.6370%0.45511.5475%0.45111.4680%0.44811.3885%0.44511.30Over Wire Measurements for 1/2 - 20 UNF* OverWire is a measuring method to obatin the pitch diameter of threads. It is mostly used when a manufacturer does not have a Go/Nogo gauge for a thread. You can learn more about it hereInchmmPermissible Wire Diameter Range0.0253 - 0.05050.642 - 1.283Ideal Wire Diameter0.02890.733Possible WiresFrom Standard Sets* 0.0262* 0.0289* 0.722* 0.866* 1.01* 1.155Once you know your wire diameter, you need to find out what is the premissable Measurement for your pitch diameter (Depending on the class). Use our Over Wire Calculator to find out!CNC Gcode Program for Turning of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerExternal RH ThreadRight hand tool, machining towards the chuckFlank Infeed method with contant volumeFlank Infeed method with contant volumeCutting conditions for steelDefault number of passesYou can configure all the above parameters and much more in our Thread Turning Gcode Generator % O0100 (MACHINING DOCTOR - THREADING CNC PROGRAM) (CONTROLER - FANUC A) (THREAD - ) (D=0.5 INCH, P=0.05 INCH, L=0.5 INCH) (APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD) (FEED - 17 PASSES, FLANK, CONSTANT VOLUME) (FINISH PASS - 0.0005 INCH) (WITH CHAMFER - NO) G28 U0 G28 U0 T0100 G99 G97 S2292 M03 G00 Z5.1 G00 X16.0 M08 G76 P010060 Q13 R0 G76 X11 Z-13 P779 Q186 F1 R G28 U0 G28 U0 M09 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %CNC Gcode Program for Thread Milling of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerInternal RH ThreadClimb MillingCutter diameter: 70% of the thread diameterSingle tooth Thread Mill cutterCutting conditions for steelOne radial passYou can configure all the above parameters and much more in our Thread Milling Gcode Generator % O0101 (WWW.MACHININGDOCTOR.COM - THREADMILLING PROGRAM) (CONTROLER - FANUC) (THREAD - MAJOR DIAM.=0.5 INCH, PITCH=0.05 INCH, LENGTH=0.5 INCH) (APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING) (CUTTER DIAM=0.25 [SINGLE TOOTH]) (CUTTER COMPENSATION D=0 - TOOLPATH FOR TOOL CENTER) N1 M06 T1 G54 G90 G40 G17 G94 G21 G00 X0 Y0 S4584 M03 G43 H1 Z25.4 M08 (M-CODE "THROUGH COOLANT ON") (PASS 1 / 1) G90 G01 Z-12.8588 F2032 G91 G01 G41 D1 X1.5875 Y-1.5875 F699 G03 X1.5875 Y1.5875 Z0.1588 I0 J1.5875 F175 G03 Z1.27 I-3.175 J0 F349 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 X-1.5875 Y1.5875 Z0.1588 I-1.5875 J0 G01 G40 X-1.5875 Y-1.5875 F2032 G90 G00 Z25.4 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %Our Top Picks

Cuttingspeedchart

* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection Tap Drill Sizes for 1/2 - 20 UNFIf not specified, assume a thread depth of 75%.You can learn more about thread depth in tapping here.To get the tap drill size in other depths, use our Tap Drill Size Calculator .Thread DepthTap Drill Size (Inch)Tap Drill Size (mm)55%0.46411.7960%0.46111.7165%0.45811.6370%0.45511.5475%0.45111.4680%0.44811.3885%0.44511.30Over Wire Measurements for 1/2 - 20 UNF* OverWire is a measuring method to obatin the pitch diameter of threads. It is mostly used when a manufacturer does not have a Go/Nogo gauge for a thread. You can learn more about it hereInchmmPermissible Wire Diameter Range0.0253 - 0.05050.642 - 1.283Ideal Wire Diameter0.02890.733Possible WiresFrom Standard Sets* 0.0262* 0.0289* 0.722* 0.866* 1.01* 1.155Once you know your wire diameter, you need to find out what is the premissable Measurement for your pitch diameter (Depending on the class). Use our Over Wire Calculator to find out!CNC Gcode Program for Turning of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerExternal RH ThreadRight hand tool, machining towards the chuckFlank Infeed method with contant volumeFlank Infeed method with contant volumeCutting conditions for steelDefault number of passesYou can configure all the above parameters and much more in our Thread Turning Gcode Generator % O0100 (MACHINING DOCTOR - THREADING CNC PROGRAM) (CONTROLER - FANUC A) (THREAD - ) (D=0.5 INCH, P=0.05 INCH, L=0.5 INCH) (APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD) (FEED - 17 PASSES, FLANK, CONSTANT VOLUME) (FINISH PASS - 0.0005 INCH) (WITH CHAMFER - NO) G28 U0 G28 U0 T0100 G99 G97 S2292 M03 G00 Z5.1 G00 X16.0 M08 G76 P010060 Q13 R0 G76 X11 Z-13 P779 Q186 F1 R G28 U0 G28 U0 M09 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %CNC Gcode Program for Thread Milling of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerInternal RH ThreadClimb MillingCutter diameter: 70% of the thread diameterSingle tooth Thread Mill cutterCutting conditions for steelOne radial passYou can configure all the above parameters and much more in our Thread Milling Gcode Generator % O0101 (WWW.MACHININGDOCTOR.COM - THREADMILLING PROGRAM) (CONTROLER - FANUC) (THREAD - MAJOR DIAM.=0.5 INCH, PITCH=0.05 INCH, LENGTH=0.5 INCH) (APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING) (CUTTER DIAM=0.25 [SINGLE TOOTH]) (CUTTER COMPENSATION D=0 - TOOLPATH FOR TOOL CENTER) N1 M06 T1 G54 G90 G40 G17 G94 G21 G00 X0 Y0 S4584 M03 G43 H1 Z25.4 M08 (M-CODE "THROUGH COOLANT ON") (PASS 1 / 1) G90 G01 Z-12.8588 F2032 G91 G01 G41 D1 X1.5875 Y-1.5875 F699 G03 X1.5875 Y1.5875 Z0.1588 I0 J1.5875 F175 G03 Z1.27 I-3.175 J0 F349 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 X-1.5875 Y1.5875 Z0.1588 I-1.5875 J0 G01 G40 X-1.5875 Y-1.5875 F2032 G90 G00 Z25.4 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %Our Top Picks

It turned out, to my delight, that Achi Mess was one of the top pilgrimages places for the vegetarian foodies of Coimbatore. It’s a bright, clean and airy place where you go only for the food, not to hang around and chat. The food is so good that you wouldn’t want to do the latter anyway. There’s a longish list of things to eat, and the accessories – sambar and chutneys – are heavenly. Everything is served on banana leaves. People in Tamil Nadu have ‘tiffin’ for breakfast and dinner, and only lunch is a full scale meal with rice, sambar, rasam and a few ‘poriyals’ (poriyal = sabzi). Tiffin is the collective word for anything that’s not eaten with a full meal, like idli, dosa, vada, pongal and a whole lot of other dishes.

Cuttingspeed formulaPDF

* Back to Thread Class Selection 1/2 - 20 UNF 3B (Internal)* Permisable values for thread Class 3B#DescriptionValue (Inch)VValue (mm)D1Minor Diameter0.4459 - 0.453711.326 - 11.524D2Pitch Diameter0.4675 - 0.471411.875 - 11.974DMajor Diameter0.5000 (Min)12.7 (Min)αVaration of 30° anngle (+/-)1.1667°PVaration of Pitch (+/-)0.0011 (Ref)0.028 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection Tap Drill Sizes for 1/2 - 20 UNFIf not specified, assume a thread depth of 75%.You can learn more about thread depth in tapping here.To get the tap drill size in other depths, use our Tap Drill Size Calculator .Thread DepthTap Drill Size (Inch)Tap Drill Size (mm)55%0.46411.7960%0.46111.7165%0.45811.6370%0.45511.5475%0.45111.4680%0.44811.3885%0.44511.30Over Wire Measurements for 1/2 - 20 UNF* OverWire is a measuring method to obatin the pitch diameter of threads. It is mostly used when a manufacturer does not have a Go/Nogo gauge for a thread. You can learn more about it hereInchmmPermissible Wire Diameter Range0.0253 - 0.05050.642 - 1.283Ideal Wire Diameter0.02890.733Possible WiresFrom Standard Sets* 0.0262* 0.0289* 0.722* 0.866* 1.01* 1.155Once you know your wire diameter, you need to find out what is the premissable Measurement for your pitch diameter (Depending on the class). Use our Over Wire Calculator to find out!CNC Gcode Program for Turning of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerExternal RH ThreadRight hand tool, machining towards the chuckFlank Infeed method with contant volumeFlank Infeed method with contant volumeCutting conditions for steelDefault number of passesYou can configure all the above parameters and much more in our Thread Turning Gcode Generator % O0100 (MACHINING DOCTOR - THREADING CNC PROGRAM) (CONTROLER - FANUC A) (THREAD - ) (D=0.5 INCH, P=0.05 INCH, L=0.5 INCH) (APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD) (FEED - 17 PASSES, FLANK, CONSTANT VOLUME) (FINISH PASS - 0.0005 INCH) (WITH CHAMFER - NO) G28 U0 G28 U0 T0100 G99 G97 S2292 M03 G00 Z5.1 G00 X16.0 M08 G76 P010060 Q13 R0 G76 X11 Z-13 P779 Q186 F1 R G28 U0 G28 U0 M09 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %CNC Gcode Program for Thread Milling of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerInternal RH ThreadClimb MillingCutter diameter: 70% of the thread diameterSingle tooth Thread Mill cutterCutting conditions for steelOne radial passYou can configure all the above parameters and much more in our Thread Milling Gcode Generator % O0101 (WWW.MACHININGDOCTOR.COM - THREADMILLING PROGRAM) (CONTROLER - FANUC) (THREAD - MAJOR DIAM.=0.5 INCH, PITCH=0.05 INCH, LENGTH=0.5 INCH) (APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING) (CUTTER DIAM=0.25 [SINGLE TOOTH]) (CUTTER COMPENSATION D=0 - TOOLPATH FOR TOOL CENTER) N1 M06 T1 G54 G90 G40 G17 G94 G21 G00 X0 Y0 S4584 M03 G43 H1 Z25.4 M08 (M-CODE "THROUGH COOLANT ON") (PASS 1 / 1) G90 G01 Z-12.8588 F2032 G91 G01 G41 D1 X1.5875 Y-1.5875 F699 G03 X1.5875 Y1.5875 Z0.1588 I0 J1.5875 F175 G03 Z1.27 I-3.175 J0 F349 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 X-1.5875 Y1.5875 Z0.1588 I-1.5875 J0 G01 G40 X-1.5875 Y-1.5875 F2032 G90 G00 Z25.4 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %Our Top Picks

* OverWire is a measuring method to obatin the pitch diameter of threads. It is mostly used when a manufacturer does not have a Go/Nogo gauge for a thread. You can learn more about it here

* Permisable values for thread Class 3A#DescriptionValue (Inch)Value (mm)esAllowance0 (Ref)0 (Ref)dMajor Diameter0.4919 - 0.512.494 - 12.7d2Pitch Diameter0.4645 - 0.467511.798 - 11.875d3Minor Diameter(UNR Only)0.4405 (Ref)11.189 (Ref)αVaration of 30° anngle (+/-)1.1667°PVaration of pitch (+/-)0.0009 (Ref)0.023 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator'* Back to Thread Class Selection 1/2 - 20 UNF 2B (Internal)* Permisable values for thread Class 2B#DescriptionValue (Inch)VValue (mm)D1Minor Diameter0.446 - 0.45711.328 - 11.608D2Pitch Diameter0.4675 - 0.472711.875 - 12.007DMajor Diameter0.5000 (Min)12.7 (Min)αVaration of 30° anngle (+/-)1.1667°PVaration of Pitch (+/-)0.0015 (Ref)0.038 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection 1/2 - 20 UNF 3B (Internal)* Permisable values for thread Class 3B#DescriptionValue (Inch)VValue (mm)D1Minor Diameter0.4459 - 0.453711.326 - 11.524D2Pitch Diameter0.4675 - 0.471411.875 - 11.974DMajor Diameter0.5000 (Min)12.7 (Min)αVaration of 30° anngle (+/-)1.1667°PVaration of Pitch (+/-)0.0011 (Ref)0.028 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection Tap Drill Sizes for 1/2 - 20 UNFIf not specified, assume a thread depth of 75%.You can learn more about thread depth in tapping here.To get the tap drill size in other depths, use our Tap Drill Size Calculator .Thread DepthTap Drill Size (Inch)Tap Drill Size (mm)55%0.46411.7960%0.46111.7165%0.45811.6370%0.45511.5475%0.45111.4680%0.44811.3885%0.44511.30Over Wire Measurements for 1/2 - 20 UNF* OverWire is a measuring method to obatin the pitch diameter of threads. It is mostly used when a manufacturer does not have a Go/Nogo gauge for a thread. You can learn more about it hereInchmmPermissible Wire Diameter Range0.0253 - 0.05050.642 - 1.283Ideal Wire Diameter0.02890.733Possible WiresFrom Standard Sets* 0.0262* 0.0289* 0.722* 0.866* 1.01* 1.155Once you know your wire diameter, you need to find out what is the premissable Measurement for your pitch diameter (Depending on the class). Use our Over Wire Calculator to find out!CNC Gcode Program for Turning of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerExternal RH ThreadRight hand tool, machining towards the chuckFlank Infeed method with contant volumeFlank Infeed method with contant volumeCutting conditions for steelDefault number of passesYou can configure all the above parameters and much more in our Thread Turning Gcode Generator % O0100 (MACHINING DOCTOR - THREADING CNC PROGRAM) (CONTROLER - FANUC A) (THREAD - ) (D=0.5 INCH, P=0.05 INCH, L=0.5 INCH) (APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD) (FEED - 17 PASSES, FLANK, CONSTANT VOLUME) (FINISH PASS - 0.0005 INCH) (WITH CHAMFER - NO) G28 U0 G28 U0 T0100 G99 G97 S2292 M03 G00 Z5.1 G00 X16.0 M08 G76 P010060 Q13 R0 G76 X11 Z-13 P779 Q186 F1 R G28 U0 G28 U0 M09 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %CNC Gcode Program for Thread Milling of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerInternal RH ThreadClimb MillingCutter diameter: 70% of the thread diameterSingle tooth Thread Mill cutterCutting conditions for steelOne radial passYou can configure all the above parameters and much more in our Thread Milling Gcode Generator % O0101 (WWW.MACHININGDOCTOR.COM - THREADMILLING PROGRAM) (CONTROLER - FANUC) (THREAD - MAJOR DIAM.=0.5 INCH, PITCH=0.05 INCH, LENGTH=0.5 INCH) (APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING) (CUTTER DIAM=0.25 [SINGLE TOOTH]) (CUTTER COMPENSATION D=0 - TOOLPATH FOR TOOL CENTER) N1 M06 T1 G54 G90 G40 G17 G94 G21 G00 X0 Y0 S4584 M03 G43 H1 Z25.4 M08 (M-CODE "THROUGH COOLANT ON") (PASS 1 / 1) G90 G01 Z-12.8588 F2032 G91 G01 G41 D1 X1.5875 Y-1.5875 F699 G03 X1.5875 Y1.5875 Z0.1588 I0 J1.5875 F175 G03 Z1.27 I-3.175 J0 F349 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 X-1.5875 Y1.5875 Z0.1588 I-1.5875 J0 G01 G40 X-1.5875 Y-1.5875 F2032 G90 G00 Z25.4 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %Our Top Picks

Spindle speed formula formilling

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* Back to Thread Class Selection 1/2 - 20 UNF 3A (External)* Permisable values for thread Class 3A#DescriptionValue (Inch)Value (mm)esAllowance0 (Ref)0 (Ref)dMajor Diameter0.4919 - 0.512.494 - 12.7d2Pitch Diameter0.4645 - 0.467511.798 - 11.875d3Minor Diameter(UNR Only)0.4405 (Ref)11.189 (Ref)αVaration of 30° anngle (+/-)1.1667°PVaration of pitch (+/-)0.0009 (Ref)0.023 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator'* Back to Thread Class Selection 1/2 - 20 UNF 2B (Internal)* Permisable values for thread Class 2B#DescriptionValue (Inch)VValue (mm)D1Minor Diameter0.446 - 0.45711.328 - 11.608D2Pitch Diameter0.4675 - 0.472711.875 - 12.007DMajor Diameter0.5000 (Min)12.7 (Min)αVaration of 30° anngle (+/-)1.1667°PVaration of Pitch (+/-)0.0015 (Ref)0.038 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection 1/2 - 20 UNF 3B (Internal)* Permisable values for thread Class 3B#DescriptionValue (Inch)VValue (mm)D1Minor Diameter0.4459 - 0.453711.326 - 11.524D2Pitch Diameter0.4675 - 0.471411.875 - 11.974DMajor Diameter0.5000 (Min)12.7 (Min)αVaration of 30° anngle (+/-)1.1667°PVaration of Pitch (+/-)0.0011 (Ref)0.028 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection Tap Drill Sizes for 1/2 - 20 UNFIf not specified, assume a thread depth of 75%.You can learn more about thread depth in tapping here.To get the tap drill size in other depths, use our Tap Drill Size Calculator .Thread DepthTap Drill Size (Inch)Tap Drill Size (mm)55%0.46411.7960%0.46111.7165%0.45811.6370%0.45511.5475%0.45111.4680%0.44811.3885%0.44511.30Over Wire Measurements for 1/2 - 20 UNF* OverWire is a measuring method to obatin the pitch diameter of threads. It is mostly used when a manufacturer does not have a Go/Nogo gauge for a thread. You can learn more about it hereInchmmPermissible Wire Diameter Range0.0253 - 0.05050.642 - 1.283Ideal Wire Diameter0.02890.733Possible WiresFrom Standard Sets* 0.0262* 0.0289* 0.722* 0.866* 1.01* 1.155Once you know your wire diameter, you need to find out what is the premissable Measurement for your pitch diameter (Depending on the class). Use our Over Wire Calculator to find out!CNC Gcode Program for Turning of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerExternal RH ThreadRight hand tool, machining towards the chuckFlank Infeed method with contant volumeFlank Infeed method with contant volumeCutting conditions for steelDefault number of passesYou can configure all the above parameters and much more in our Thread Turning Gcode Generator % O0100 (MACHINING DOCTOR - THREADING CNC PROGRAM) (CONTROLER - FANUC A) (THREAD - ) (D=0.5 INCH, P=0.05 INCH, L=0.5 INCH) (APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD) (FEED - 17 PASSES, FLANK, CONSTANT VOLUME) (FINISH PASS - 0.0005 INCH) (WITH CHAMFER - NO) G28 U0 G28 U0 T0100 G99 G97 S2292 M03 G00 Z5.1 G00 X16.0 M08 G76 P010060 Q13 R0 G76 X11 Z-13 P779 Q186 F1 R G28 U0 G28 U0 M09 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %CNC Gcode Program for Thread Milling of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerInternal RH ThreadClimb MillingCutter diameter: 70% of the thread diameterSingle tooth Thread Mill cutterCutting conditions for steelOne radial passYou can configure all the above parameters and much more in our Thread Milling Gcode Generator % O0101 (WWW.MACHININGDOCTOR.COM - THREADMILLING PROGRAM) (CONTROLER - FANUC) (THREAD - MAJOR DIAM.=0.5 INCH, PITCH=0.05 INCH, LENGTH=0.5 INCH) (APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING) (CUTTER DIAM=0.25 [SINGLE TOOTH]) (CUTTER COMPENSATION D=0 - TOOLPATH FOR TOOL CENTER) N1 M06 T1 G54 G90 G40 G17 G94 G21 G00 X0 Y0 S4584 M03 G43 H1 Z25.4 M08 (M-CODE "THROUGH COOLANT ON") (PASS 1 / 1) G90 G01 Z-12.8588 F2032 G91 G01 G41 D1 X1.5875 Y-1.5875 F699 G03 X1.5875 Y1.5875 Z0.1588 I0 J1.5875 F175 G03 Z1.27 I-3.175 J0 F349 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 X-1.5875 Y1.5875 Z0.1588 I-1.5875 J0 G01 G40 X-1.5875 Y-1.5875 F2032 G90 G00 Z25.4 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %Our Top Picks

Spindle speed formula fordrilling

* Permisable values for thread Class 2B#DescriptionValue (Inch)VValue (mm)D1Minor Diameter0.446 - 0.45711.328 - 11.608D2Pitch Diameter0.4675 - 0.472711.875 - 12.007DMajor Diameter0.5000 (Min)12.7 (Min)αVaration of 30° anngle (+/-)1.1667°PVaration of Pitch (+/-)0.0015 (Ref)0.038 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection 1/2 - 20 UNF 3B (Internal)* Permisable values for thread Class 3B#DescriptionValue (Inch)VValue (mm)D1Minor Diameter0.4459 - 0.453711.326 - 11.524D2Pitch Diameter0.4675 - 0.471411.875 - 11.974DMajor Diameter0.5000 (Min)12.7 (Min)αVaration of 30° anngle (+/-)1.1667°PVaration of Pitch (+/-)0.0011 (Ref)0.028 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection Tap Drill Sizes for 1/2 - 20 UNFIf not specified, assume a thread depth of 75%.You can learn more about thread depth in tapping here.To get the tap drill size in other depths, use our Tap Drill Size Calculator .Thread DepthTap Drill Size (Inch)Tap Drill Size (mm)55%0.46411.7960%0.46111.7165%0.45811.6370%0.45511.5475%0.45111.4680%0.44811.3885%0.44511.30Over Wire Measurements for 1/2 - 20 UNF* OverWire is a measuring method to obatin the pitch diameter of threads. It is mostly used when a manufacturer does not have a Go/Nogo gauge for a thread. You can learn more about it hereInchmmPermissible Wire Diameter Range0.0253 - 0.05050.642 - 1.283Ideal Wire Diameter0.02890.733Possible WiresFrom Standard Sets* 0.0262* 0.0289* 0.722* 0.866* 1.01* 1.155Once you know your wire diameter, you need to find out what is the premissable Measurement for your pitch diameter (Depending on the class). Use our Over Wire Calculator to find out!CNC Gcode Program for Turning of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerExternal RH ThreadRight hand tool, machining towards the chuckFlank Infeed method with contant volumeFlank Infeed method with contant volumeCutting conditions for steelDefault number of passesYou can configure all the above parameters and much more in our Thread Turning Gcode Generator % O0100 (MACHINING DOCTOR - THREADING CNC PROGRAM) (CONTROLER - FANUC A) (THREAD - ) (D=0.5 INCH, P=0.05 INCH, L=0.5 INCH) (APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD) (FEED - 17 PASSES, FLANK, CONSTANT VOLUME) (FINISH PASS - 0.0005 INCH) (WITH CHAMFER - NO) G28 U0 G28 U0 T0100 G99 G97 S2292 M03 G00 Z5.1 G00 X16.0 M08 G76 P010060 Q13 R0 G76 X11 Z-13 P779 Q186 F1 R G28 U0 G28 U0 M09 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %CNC Gcode Program for Thread Milling of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerInternal RH ThreadClimb MillingCutter diameter: 70% of the thread diameterSingle tooth Thread Mill cutterCutting conditions for steelOne radial passYou can configure all the above parameters and much more in our Thread Milling Gcode Generator % O0101 (WWW.MACHININGDOCTOR.COM - THREADMILLING PROGRAM) (CONTROLER - FANUC) (THREAD - MAJOR DIAM.=0.5 INCH, PITCH=0.05 INCH, LENGTH=0.5 INCH) (APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING) (CUTTER DIAM=0.25 [SINGLE TOOTH]) (CUTTER COMPENSATION D=0 - TOOLPATH FOR TOOL CENTER) N1 M06 T1 G54 G90 G40 G17 G94 G21 G00 X0 Y0 S4584 M03 G43 H1 Z25.4 M08 (M-CODE "THROUGH COOLANT ON") (PASS 1 / 1) G90 G01 Z-12.8588 F2032 G91 G01 G41 D1 X1.5875 Y-1.5875 F699 G03 X1.5875 Y1.5875 Z0.1588 I0 J1.5875 F175 G03 Z1.27 I-3.175 J0 F349 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 X-1.5875 Y1.5875 Z0.1588 I-1.5875 J0 G01 G40 X-1.5875 Y-1.5875 F2032 G90 G00 Z25.4 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %Our Top Picks

Spindle speedcalculator milling

* Back to Thread Class Selection 1/2 - 20 UNF 2B (Internal)* Permisable values for thread Class 2B#DescriptionValue (Inch)VValue (mm)D1Minor Diameter0.446 - 0.45711.328 - 11.608D2Pitch Diameter0.4675 - 0.472711.875 - 12.007DMajor Diameter0.5000 (Min)12.7 (Min)αVaration of 30° anngle (+/-)1.1667°PVaration of Pitch (+/-)0.0015 (Ref)0.038 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection 1/2 - 20 UNF 3B (Internal)* Permisable values for thread Class 3B#DescriptionValue (Inch)VValue (mm)D1Minor Diameter0.4459 - 0.453711.326 - 11.524D2Pitch Diameter0.4675 - 0.471411.875 - 11.974DMajor Diameter0.5000 (Min)12.7 (Min)αVaration of 30° anngle (+/-)1.1667°PVaration of Pitch (+/-)0.0011 (Ref)0.028 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection Tap Drill Sizes for 1/2 - 20 UNFIf not specified, assume a thread depth of 75%.You can learn more about thread depth in tapping here.To get the tap drill size in other depths, use our Tap Drill Size Calculator .Thread DepthTap Drill Size (Inch)Tap Drill Size (mm)55%0.46411.7960%0.46111.7165%0.45811.6370%0.45511.5475%0.45111.4680%0.44811.3885%0.44511.30Over Wire Measurements for 1/2 - 20 UNF* OverWire is a measuring method to obatin the pitch diameter of threads. It is mostly used when a manufacturer does not have a Go/Nogo gauge for a thread. You can learn more about it hereInchmmPermissible Wire Diameter Range0.0253 - 0.05050.642 - 1.283Ideal Wire Diameter0.02890.733Possible WiresFrom Standard Sets* 0.0262* 0.0289* 0.722* 0.866* 1.01* 1.155Once you know your wire diameter, you need to find out what is the premissable Measurement for your pitch diameter (Depending on the class). Use our Over Wire Calculator to find out!CNC Gcode Program for Turning of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerExternal RH ThreadRight hand tool, machining towards the chuckFlank Infeed method with contant volumeFlank Infeed method with contant volumeCutting conditions for steelDefault number of passesYou can configure all the above parameters and much more in our Thread Turning Gcode Generator % O0100 (MACHINING DOCTOR - THREADING CNC PROGRAM) (CONTROLER - FANUC A) (THREAD - ) (D=0.5 INCH, P=0.05 INCH, L=0.5 INCH) (APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD) (FEED - 17 PASSES, FLANK, CONSTANT VOLUME) (FINISH PASS - 0.0005 INCH) (WITH CHAMFER - NO) G28 U0 G28 U0 T0100 G99 G97 S2292 M03 G00 Z5.1 G00 X16.0 M08 G76 P010060 Q13 R0 G76 X11 Z-13 P779 Q186 F1 R G28 U0 G28 U0 M09 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %CNC Gcode Program for Thread Milling of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerInternal RH ThreadClimb MillingCutter diameter: 70% of the thread diameterSingle tooth Thread Mill cutterCutting conditions for steelOne radial passYou can configure all the above parameters and much more in our Thread Milling Gcode Generator % O0101 (WWW.MACHININGDOCTOR.COM - THREADMILLING PROGRAM) (CONTROLER - FANUC) (THREAD - MAJOR DIAM.=0.5 INCH, PITCH=0.05 INCH, LENGTH=0.5 INCH) (APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING) (CUTTER DIAM=0.25 [SINGLE TOOTH]) (CUTTER COMPENSATION D=0 - TOOLPATH FOR TOOL CENTER) N1 M06 T1 G54 G90 G40 G17 G94 G21 G00 X0 Y0 S4584 M03 G43 H1 Z25.4 M08 (M-CODE "THROUGH COOLANT ON") (PASS 1 / 1) G90 G01 Z-12.8588 F2032 G91 G01 G41 D1 X1.5875 Y-1.5875 F699 G03 X1.5875 Y1.5875 Z0.1588 I0 J1.5875 F175 G03 Z1.27 I-3.175 J0 F349 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 X-1.5875 Y1.5875 Z0.1588 I-1.5875 J0 G01 G40 X-1.5875 Y-1.5875 F2032 G90 G00 Z25.4 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %Our Top Picks

Spindle speedunit

* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection 1/2 - 20 UNF 3B (Internal)* Permisable values for thread Class 3B#DescriptionValue (Inch)VValue (mm)D1Minor Diameter0.4459 - 0.453711.326 - 11.524D2Pitch Diameter0.4675 - 0.471411.875 - 11.974DMajor Diameter0.5000 (Min)12.7 (Min)αVaration of 30° anngle (+/-)1.1667°PVaration of Pitch (+/-)0.0011 (Ref)0.028 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection Tap Drill Sizes for 1/2 - 20 UNFIf not specified, assume a thread depth of 75%.You can learn more about thread depth in tapping here.To get the tap drill size in other depths, use our Tap Drill Size Calculator .Thread DepthTap Drill Size (Inch)Tap Drill Size (mm)55%0.46411.7960%0.46111.7165%0.45811.6370%0.45511.5475%0.45111.4680%0.44811.3885%0.44511.30Over Wire Measurements for 1/2 - 20 UNF* OverWire is a measuring method to obatin the pitch diameter of threads. It is mostly used when a manufacturer does not have a Go/Nogo gauge for a thread. You can learn more about it hereInchmmPermissible Wire Diameter Range0.0253 - 0.05050.642 - 1.283Ideal Wire Diameter0.02890.733Possible WiresFrom Standard Sets* 0.0262* 0.0289* 0.722* 0.866* 1.01* 1.155Once you know your wire diameter, you need to find out what is the premissable Measurement for your pitch diameter (Depending on the class). Use our Over Wire Calculator to find out!CNC Gcode Program for Turning of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerExternal RH ThreadRight hand tool, machining towards the chuckFlank Infeed method with contant volumeFlank Infeed method with contant volumeCutting conditions for steelDefault number of passesYou can configure all the above parameters and much more in our Thread Turning Gcode Generator % O0100 (MACHINING DOCTOR - THREADING CNC PROGRAM) (CONTROLER - FANUC A) (THREAD - ) (D=0.5 INCH, P=0.05 INCH, L=0.5 INCH) (APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD) (FEED - 17 PASSES, FLANK, CONSTANT VOLUME) (FINISH PASS - 0.0005 INCH) (WITH CHAMFER - NO) G28 U0 G28 U0 T0100 G99 G97 S2292 M03 G00 Z5.1 G00 X16.0 M08 G76 P010060 Q13 R0 G76 X11 Z-13 P779 Q186 F1 R G28 U0 G28 U0 M09 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %CNC Gcode Program for Thread Milling of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerInternal RH ThreadClimb MillingCutter diameter: 70% of the thread diameterSingle tooth Thread Mill cutterCutting conditions for steelOne radial passYou can configure all the above parameters and much more in our Thread Milling Gcode Generator % O0101 (WWW.MACHININGDOCTOR.COM - THREADMILLING PROGRAM) (CONTROLER - FANUC) (THREAD - MAJOR DIAM.=0.5 INCH, PITCH=0.05 INCH, LENGTH=0.5 INCH) (APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING) (CUTTER DIAM=0.25 [SINGLE TOOTH]) (CUTTER COMPENSATION D=0 - TOOLPATH FOR TOOL CENTER) N1 M06 T1 G54 G90 G40 G17 G94 G21 G00 X0 Y0 S4584 M03 G43 H1 Z25.4 M08 (M-CODE "THROUGH COOLANT ON") (PASS 1 / 1) G90 G01 Z-12.8588 F2032 G91 G01 G41 D1 X1.5875 Y-1.5875 F699 G03 X1.5875 Y1.5875 Z0.1588 I0 J1.5875 F175 G03 Z1.27 I-3.175 J0 F349 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 X-1.5875 Y1.5875 Z0.1588 I-1.5875 J0 G01 G40 X-1.5875 Y-1.5875 F2032 G90 G00 Z25.4 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %Our Top Picks

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Spindle speedand feed rateformula

* Permisable values for thread Class 2A#DescriptionValue (Inch)Value (mm)esAllowance0.0012 (Ref)0.03 (Ref)dMajor Diameter0.4907 - 0.498812.464 - 12.67d2Pitch Diameter0.4623 - 0.466311.742 - 11.844d3Minor Diameter(UNR Only)0.4393 (Ref)11.158 (Ref)αVaration of 30° anngle (+/-)1.1667°PVaration of pitch (+/-)0.0011 (Ref)0.028 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator'* Back to Thread Class Selection 1/2 - 20 UNF 3A (External)* Permisable values for thread Class 3A#DescriptionValue (Inch)Value (mm)esAllowance0 (Ref)0 (Ref)dMajor Diameter0.4919 - 0.512.494 - 12.7d2Pitch Diameter0.4645 - 0.467511.798 - 11.875d3Minor Diameter(UNR Only)0.4405 (Ref)11.189 (Ref)αVaration of 30° anngle (+/-)1.1667°PVaration of pitch (+/-)0.0009 (Ref)0.023 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator'* Back to Thread Class Selection 1/2 - 20 UNF 2B (Internal)* Permisable values for thread Class 2B#DescriptionValue (Inch)VValue (mm)D1Minor Diameter0.446 - 0.45711.328 - 11.608D2Pitch Diameter0.4675 - 0.472711.875 - 12.007DMajor Diameter0.5000 (Min)12.7 (Min)αVaration of 30° anngle (+/-)1.1667°PVaration of Pitch (+/-)0.0015 (Ref)0.038 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection 1/2 - 20 UNF 3B (Internal)* Permisable values for thread Class 3B#DescriptionValue (Inch)VValue (mm)D1Minor Diameter0.4459 - 0.453711.326 - 11.524D2Pitch Diameter0.4675 - 0.471411.875 - 11.974DMajor Diameter0.5000 (Min)12.7 (Min)αVaration of 30° anngle (+/-)1.1667°PVaration of Pitch (+/-)0.0011 (Ref)0.028 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection Tap Drill Sizes for 1/2 - 20 UNFIf not specified, assume a thread depth of 75%.You can learn more about thread depth in tapping here.To get the tap drill size in other depths, use our Tap Drill Size Calculator .Thread DepthTap Drill Size (Inch)Tap Drill Size (mm)55%0.46411.7960%0.46111.7165%0.45811.6370%0.45511.5475%0.45111.4680%0.44811.3885%0.44511.30Over Wire Measurements for 1/2 - 20 UNF* OverWire is a measuring method to obatin the pitch diameter of threads. It is mostly used when a manufacturer does not have a Go/Nogo gauge for a thread. You can learn more about it hereInchmmPermissible Wire Diameter Range0.0253 - 0.05050.642 - 1.283Ideal Wire Diameter0.02890.733Possible WiresFrom Standard Sets* 0.0262* 0.0289* 0.722* 0.866* 1.01* 1.155Once you know your wire diameter, you need to find out what is the premissable Measurement for your pitch diameter (Depending on the class). Use our Over Wire Calculator to find out!CNC Gcode Program for Turning of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerExternal RH ThreadRight hand tool, machining towards the chuckFlank Infeed method with contant volumeFlank Infeed method with contant volumeCutting conditions for steelDefault number of passesYou can configure all the above parameters and much more in our Thread Turning Gcode Generator % O0100 (MACHINING DOCTOR - THREADING CNC PROGRAM) (CONTROLER - FANUC A) (THREAD - ) (D=0.5 INCH, P=0.05 INCH, L=0.5 INCH) (APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD) (FEED - 17 PASSES, FLANK, CONSTANT VOLUME) (FINISH PASS - 0.0005 INCH) (WITH CHAMFER - NO) G28 U0 G28 U0 T0100 G99 G97 S2292 M03 G00 Z5.1 G00 X16.0 M08 G76 P010060 Q13 R0 G76 X11 Z-13 P779 Q186 F1 R G28 U0 G28 U0 M09 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %CNC Gcode Program for Thread Milling of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerInternal RH ThreadClimb MillingCutter diameter: 70% of the thread diameterSingle tooth Thread Mill cutterCutting conditions for steelOne radial passYou can configure all the above parameters and much more in our Thread Milling Gcode Generator % O0101 (WWW.MACHININGDOCTOR.COM - THREADMILLING PROGRAM) (CONTROLER - FANUC) (THREAD - MAJOR DIAM.=0.5 INCH, PITCH=0.05 INCH, LENGTH=0.5 INCH) (APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING) (CUTTER DIAM=0.25 [SINGLE TOOTH]) (CUTTER COMPENSATION D=0 - TOOLPATH FOR TOOL CENTER) N1 M06 T1 G54 G90 G40 G17 G94 G21 G00 X0 Y0 S4584 M03 G43 H1 Z25.4 M08 (M-CODE "THROUGH COOLANT ON") (PASS 1 / 1) G90 G01 Z-12.8588 F2032 G91 G01 G41 D1 X1.5875 Y-1.5875 F699 G03 X1.5875 Y1.5875 Z0.1588 I0 J1.5875 F175 G03 Z1.27 I-3.175 J0 F349 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 X-1.5875 Y1.5875 Z0.1588 I-1.5875 J0 G01 G40 X-1.5875 Y-1.5875 F2032 G90 G00 Z25.4 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %Our Top Picks

On lathes, where the part is rotating, the cutting speed depends on:1. Rotation speed of the part2. Diameter at which the tool is doing the cutting.

After a hard day’s work I went back to my hotel, dumped all my work stuff, and popped over to Achi Mess for a light meal (which at night is tiffin). The food being so good, and my will power being rather weak when it comes to food, the light meal became a heavy one. Now I know which hotel I’m going to stay in whenever I go to Coimbatore – not because of the hotel itself, but because of its neighbour.

* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator'* Back to Thread Class Selection 1/2 - 20 UNF 2B (Internal)* Permisable values for thread Class 2B#DescriptionValue (Inch)VValue (mm)D1Minor Diameter0.446 - 0.45711.328 - 11.608D2Pitch Diameter0.4675 - 0.472711.875 - 12.007DMajor Diameter0.5000 (Min)12.7 (Min)αVaration of 30° anngle (+/-)1.1667°PVaration of Pitch (+/-)0.0015 (Ref)0.038 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection 1/2 - 20 UNF 3B (Internal)* Permisable values for thread Class 3B#DescriptionValue (Inch)VValue (mm)D1Minor Diameter0.4459 - 0.453711.326 - 11.524D2Pitch Diameter0.4675 - 0.471411.875 - 11.974DMajor Diameter0.5000 (Min)12.7 (Min)αVaration of 30° anngle (+/-)1.1667°PVaration of Pitch (+/-)0.0011 (Ref)0.028 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection Tap Drill Sizes for 1/2 - 20 UNFIf not specified, assume a thread depth of 75%.You can learn more about thread depth in tapping here.To get the tap drill size in other depths, use our Tap Drill Size Calculator .Thread DepthTap Drill Size (Inch)Tap Drill Size (mm)55%0.46411.7960%0.46111.7165%0.45811.6370%0.45511.5475%0.45111.4680%0.44811.3885%0.44511.30Over Wire Measurements for 1/2 - 20 UNF* OverWire is a measuring method to obatin the pitch diameter of threads. It is mostly used when a manufacturer does not have a Go/Nogo gauge for a thread. You can learn more about it hereInchmmPermissible Wire Diameter Range0.0253 - 0.05050.642 - 1.283Ideal Wire Diameter0.02890.733Possible WiresFrom Standard Sets* 0.0262* 0.0289* 0.722* 0.866* 1.01* 1.155Once you know your wire diameter, you need to find out what is the premissable Measurement for your pitch diameter (Depending on the class). Use our Over Wire Calculator to find out!CNC Gcode Program for Turning of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerExternal RH ThreadRight hand tool, machining towards the chuckFlank Infeed method with contant volumeFlank Infeed method with contant volumeCutting conditions for steelDefault number of passesYou can configure all the above parameters and much more in our Thread Turning Gcode Generator % O0100 (MACHINING DOCTOR - THREADING CNC PROGRAM) (CONTROLER - FANUC A) (THREAD - ) (D=0.5 INCH, P=0.05 INCH, L=0.5 INCH) (APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD) (FEED - 17 PASSES, FLANK, CONSTANT VOLUME) (FINISH PASS - 0.0005 INCH) (WITH CHAMFER - NO) G28 U0 G28 U0 T0100 G99 G97 S2292 M03 G00 Z5.1 G00 X16.0 M08 G76 P010060 Q13 R0 G76 X11 Z-13 P779 Q186 F1 R G28 U0 G28 U0 M09 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %CNC Gcode Program for Thread Milling of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerInternal RH ThreadClimb MillingCutter diameter: 70% of the thread diameterSingle tooth Thread Mill cutterCutting conditions for steelOne radial passYou can configure all the above parameters and much more in our Thread Milling Gcode Generator % O0101 (WWW.MACHININGDOCTOR.COM - THREADMILLING PROGRAM) (CONTROLER - FANUC) (THREAD - MAJOR DIAM.=0.5 INCH, PITCH=0.05 INCH, LENGTH=0.5 INCH) (APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING) (CUTTER DIAM=0.25 [SINGLE TOOTH]) (CUTTER COMPENSATION D=0 - TOOLPATH FOR TOOL CENTER) N1 M06 T1 G54 G90 G40 G17 G94 G21 G00 X0 Y0 S4584 M03 G43 H1 Z25.4 M08 (M-CODE "THROUGH COOLANT ON") (PASS 1 / 1) G90 G01 Z-12.8588 F2032 G91 G01 G41 D1 X1.5875 Y-1.5875 F699 G03 X1.5875 Y1.5875 Z0.1588 I0 J1.5875 F175 G03 Z1.27 I-3.175 J0 F349 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 X-1.5875 Y1.5875 Z0.1588 I-1.5875 J0 G01 G40 X-1.5875 Y-1.5875 F2032 G90 G00 Z25.4 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %Our Top Picks

In milling, where the tool is rotation, the cutting speed depends on:1. Rotation speed of the tool2. Diameter of the tool.

Once you know your wire diameter, you need to find out what is the premissable Measurement for your pitch diameter (Depending on the class). Use our Over Wire Calculator to find out!

Spindle speed formula forturning

* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator'* Back to Thread Class Selection 1/2 - 20 UNF 3A (External)* Permisable values for thread Class 3A#DescriptionValue (Inch)Value (mm)esAllowance0 (Ref)0 (Ref)dMajor Diameter0.4919 - 0.512.494 - 12.7d2Pitch Diameter0.4645 - 0.467511.798 - 11.875d3Minor Diameter(UNR Only)0.4405 (Ref)11.189 (Ref)αVaration of 30° anngle (+/-)1.1667°PVaration of pitch (+/-)0.0009 (Ref)0.023 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator'* Back to Thread Class Selection 1/2 - 20 UNF 2B (Internal)* Permisable values for thread Class 2B#DescriptionValue (Inch)VValue (mm)D1Minor Diameter0.446 - 0.45711.328 - 11.608D2Pitch Diameter0.4675 - 0.472711.875 - 12.007DMajor Diameter0.5000 (Min)12.7 (Min)αVaration of 30° anngle (+/-)1.1667°PVaration of Pitch (+/-)0.0015 (Ref)0.038 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection 1/2 - 20 UNF 3B (Internal)* Permisable values for thread Class 3B#DescriptionValue (Inch)VValue (mm)D1Minor Diameter0.4459 - 0.453711.326 - 11.524D2Pitch Diameter0.4675 - 0.471411.875 - 11.974DMajor Diameter0.5000 (Min)12.7 (Min)αVaration of 30° anngle (+/-)1.1667°PVaration of Pitch (+/-)0.0011 (Ref)0.028 (Ref)* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator* Back to Thread Class Selection Tap Drill Sizes for 1/2 - 20 UNFIf not specified, assume a thread depth of 75%.You can learn more about thread depth in tapping here.To get the tap drill size in other depths, use our Tap Drill Size Calculator .Thread DepthTap Drill Size (Inch)Tap Drill Size (mm)55%0.46411.7960%0.46111.7165%0.45811.6370%0.45511.5475%0.45111.4680%0.44811.3885%0.44511.30Over Wire Measurements for 1/2 - 20 UNF* OverWire is a measuring method to obatin the pitch diameter of threads. It is mostly used when a manufacturer does not have a Go/Nogo gauge for a thread. You can learn more about it hereInchmmPermissible Wire Diameter Range0.0253 - 0.05050.642 - 1.283Ideal Wire Diameter0.02890.733Possible WiresFrom Standard Sets* 0.0262* 0.0289* 0.722* 0.866* 1.01* 1.155Once you know your wire diameter, you need to find out what is the premissable Measurement for your pitch diameter (Depending on the class). Use our Over Wire Calculator to find out!CNC Gcode Program for Turning of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerExternal RH ThreadRight hand tool, machining towards the chuckFlank Infeed method with contant volumeFlank Infeed method with contant volumeCutting conditions for steelDefault number of passesYou can configure all the above parameters and much more in our Thread Turning Gcode Generator % O0100 (MACHINING DOCTOR - THREADING CNC PROGRAM) (CONTROLER - FANUC A) (THREAD - ) (D=0.5 INCH, P=0.05 INCH, L=0.5 INCH) (APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD) (FEED - 17 PASSES, FLANK, CONSTANT VOLUME) (FINISH PASS - 0.0005 INCH) (WITH CHAMFER - NO) G28 U0 G28 U0 T0100 G99 G97 S2292 M03 G00 Z5.1 G00 X16.0 M08 G76 P010060 Q13 R0 G76 X11 Z-13 P779 Q186 F1 R G28 U0 G28 U0 M09 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %CNC Gcode Program for Thread Milling of 1/2 - 20 UNFThe below sample Gcode is configured for:Fanuc ControllerInternal RH ThreadClimb MillingCutter diameter: 70% of the thread diameterSingle tooth Thread Mill cutterCutting conditions for steelOne radial passYou can configure all the above parameters and much more in our Thread Milling Gcode Generator % O0101 (WWW.MACHININGDOCTOR.COM - THREADMILLING PROGRAM) (CONTROLER - FANUC) (THREAD - MAJOR DIAM.=0.5 INCH, PITCH=0.05 INCH, LENGTH=0.5 INCH) (APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING) (CUTTER DIAM=0.25 [SINGLE TOOTH]) (CUTTER COMPENSATION D=0 - TOOLPATH FOR TOOL CENTER) N1 M06 T1 G54 G90 G40 G17 G94 G21 G00 X0 Y0 S4584 M03 G43 H1 Z25.4 M08 (M-CODE "THROUGH COOLANT ON") (PASS 1 / 1) G90 G01 Z-12.8588 F2032 G91 G01 G41 D1 X1.5875 Y-1.5875 F699 G03 X1.5875 Y1.5875 Z0.1588 I0 J1.5875 F175 G03 Z1.27 I-3.175 J0 F349 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 Z1.27 I-3.175 J0 G03 X-1.5875 Y1.5875 Z0.1588 I-1.5875 J0 G01 G40 X-1.5875 Y-1.5875 F2032 G90 G00 Z25.4 M30 (PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.) %Our Top Picks

When I stayed in a hotel in Coimbatore, I was given directions that said the nearest landmark was Achi Mess. Messes are small simple eateries in South India, and I was wondering why the location of a large hotel would be defined by a small eatery nearby.

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