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Minimum/Maximum Contact Angle - At a point on a surface the contact angle is the angle between the normal to the surface and the tool axis (vertical). ('Surface' being used in the generic sense; includes surfaces within solid models.)
Only the regions where the contact angle is within the Minimum and Maximum values are machined.
You can specify angles between 0 and 90, except for Minimum Contact Angle which can only be up to 85. The defaults are 0 (min) and 90 (max). The minimum and maximum contact angles cannot be the same value, and they are automatically switched if you specify a Maximum value lower than the Minimum value.
If these settings break the toolpath into separate regions, the normal rules for leads, links and ordering are applied to each region and the move between the regions.