Calculate Z-axis plunge depth for countersinks, spot drills, and chamfer mills.
Inputs
Formulas used: Plunge Depth (Z) = (Outer Dia - Inner Dia) / (2 × tan(Angle / 2)) If using a tool with a non-sharp flat tip, enter its diameter to adjust the Z
zero height requirement. If you are spotting a flat surface (no pilot hole), set Pilot Hole Dia
to 0.