### Surface Finish Calc - Villa Machine Associates Inc.

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.

### Milling Step-over Distance Calculator

Milling Step-over Distance Calculator In many milling operations the cutting tool must step over and make several adjacent cuts to complete machining a feature. As a result a small cusp of material called a scallop will remain between these cuts on any surrounding walls or on the machined surface if a ball end mill is used.

### AMIT 135: Lesson 7 Ball Mills and Circuits – Mining Mill

For overflow ball mills the charge should not exceed 45% of the mill volume . For grate discharge mills the charge should occupy about 50% of the mill volume . Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge He and the radius of the mill R i.e.

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