This operation has some wide-ranging effects, however, especially when used with the Attempt chamfer w/ spot and tool optimization. Of those three settings, tool optimization has the highest priority and its decisions override settings with a lower priority.
For example, a spot drill operation could be performed with either a spot drill or a center drill. Spot drills with a tip angle of 90
can also perform a chamfering operation. You specify a specific tool to cut the hole's chamfer and also turn on
Attempt Chamfer w/ spot and tool optimization. If there is an appropriate spot drill in the tool crib,
FeatureCAM optimizes things and use this tool in spite of your lower priority override. Even though you selected a specific tool, your other settings conflicted with and superseded your choice.
This is the advantage of the optimization and simulation functions in FeatureCAM. As you work through the optimization settings, and see where you can optimize automatically and where you cannot, you can find ways to group your parts for faster production, but still use specific tools for specific effects when needed.