Click the Stepover Options button on the Stepover tab to open the Rough Stepover Options dialog:
For Pocket, Rectangular Pocket, and Boss and features, FeatureCAM provides several different milling methods for roughing:
Stepover — Select the stepover type in the list.
Spiral % — Enter the percentage of the tool diameter to use for the radial depth of cut for machining the bottom of a milled feature when using the spiral method.
Zigzag % — This is the percentage of tool diameter to use for radial depth of cut for roughing the bottom of a milled feature when using the zigzag method.