Stock curve overcut % applies to three types of surface milling features, spiral toolpaths designated as a boss on the boundary page, features cut with projection milling technique that do not have an explicit boundary curve and select Z level rough passes. In the boss case this attribute applies only to how the toolpaths behave around the stock boundary. For other 3D surface milling features use the cut allowance feature described on the boundary page. The stock overcut % only applies if Use stock dimensions as boundary is selected on the feature's Boundaries tab.
Stock curve specifies what percentage of the tool approaches or passes beyond the stock boundary.
It can have a value between -100 and 100 with the following meanings:
0 Puts the centerline of the tool on the stock curve.
100 Overcuts the region by a tool radius.
-100 Stops one tool radius short of the stock curve.
For Z level rough, this attribute applies to all features except pocket features without stock curves. This attribute controls the outer extend of boss features and the amount that pocket feature cuts beyond its boundary. The default value is 100% which puts the edge of the tool on the boundary. A number greater than 100 will extend the toolpaths beyond the boundary. A number less than 100 will essentially offset the outer boundary and clip the toolpaths against this closer boundary.