How To Calculate The Effective Diameter for a Ball Nose Cutter

When cutting less than full depth with a ball nose cutter, the effective cutting diameter is smaller than the actual diameter of the cutter, and dependent on the depth of cut. This effective cutting diameter is used for feed and speed calculations.

The formula used to calculate the effective cutting diameter is as follows:

Effective Diameter = 2 * (((R ^ 2) - (R - Depth of cut) ^ 2) ^ 0.5)

where,

R = The Cutter Diameter divided by 2



In DzynSource Mold Engineering Software, simply Enter the cutter diameter and the depth of cut in the appropriate text boxes.  Press Calculate.  The answer appears above the Calculate button.

Use the Clear button to clear all fields, however this is not necessary in order to do another calculation. You may simply type over the previous entries.

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Press Menu to return to the main menu selection area.