Calculating the depth to feed a center drill, spot drill, or countersink to machine a specific chamfer diameter on the face of a part is one of those recurring time-wasters that every programmer and machinist is familiar with.
The drill depth calculator turns this into a few seconds' work. It even handles countersinks with a flat on the end.
The calculator can also tell you how deep to send a twist drill to machine a full-diameter hole of a specific depth. The calculation is optimized by allowing for the width of the chisel point on the end of the drill, which is calculated as a percentage of the drill diameter.
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How deep to send that countersink? Need a calculator?
Close Tolerance Software - Tools For Machining Professionals