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Form tap drill sizeChart

Next, calculate or measure the RPM of the drill. In this case, the drill is rotating at a rate of 1000 rotations per minute.

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4 40 form tap drill sizepdf

Form tap drillchart pdf

First, determine or measure the diameter of the drill. In this example, the drill is measured to have a diameter of 2.5 inches.

A drill SFM, short for drill surface feet per minute, is a measure of the linear tangential distance the surface of the drill travels per minute of time.

The following example problem outlines the steps and information needed to calculate a drill’s surface feet per minute (DSFM).