The Constant DOC option controls how the Depth of cut attribute is used to calculate the X depth of roughing passes.
If Constant DOC is deselected, cuts are guaranteed not to exceed the Depth of cut, but some cuts may be less than that amount. A pass is performed at each step. The area above each step is divided into equal regions with a depth of less than the Depth of Cut.
In the example below, the bottom three cutter paths are aligned with the steps. The top region is divided into two equal regions with shallow depths of cut.
Aligned with steps Shallow cut |
If Constant DOC is selected, each pass is performed at a consistent depth of cut. If required, the pass also climbs and cleans up previous steps. In the figure below, the first cut is performed straight across at the specified Depth of cut.
Depth of cut |
In the next pass, the tool cuts across at the specified depth of cut and then the tool climbs up the wall and the previous step is cut to with the finish allowance.
Cleanup of previous steps |