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The calculators below are designed to help calculate the adjusted radius of an endmill with a corner radius on a slope and the surface finish of a ball endmill respectively.***

This is explained in further detail below.

Changing the values in the calculator(s) will update other values.

As one can see, in the two pictures below, an end mill with a corner radius on a shallow slope produces much shallower scallops than a ballnose end mill would. This results in a better surface finish and much faster machining time. The "FAKE BALL NOSE DIA CALC" is designed to give you an accurate calculation of the adjusted diameter for calculating surface finish. The "SURFACE FINISH" calculator also includes a stepover adjustment calculator for internal, and external radii. A ballnose end mill makes smaller scallops on an internal radius, and larger scallops on an external radius, and so it must be adjusted to maintain consistent surface finish. Click the pictures for a larger version.

corner radius endmill scallops

End mill w/ corner radii = broad shallow scallops

ball endmill scallops

Ballnose end mill = deep narrow scallops

***Villa Machine Associates Inc. assumes no responsibility for the results produced by these calculators. The results are theoretical and are for planning purposes only.

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