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You're welcome! I don't completely understand how it works either, but looking at a simulation while watching the Info tab can help figure out what's going on.
For example, I did a 3D Adaptive Clearing operation and then watched the Simulation. With the Tolerance set at 0.001" and no Smoothing or Stock to Leave the tool never got closer than 0.006" to the top face of the model. As an experiment I changed the tolerance to 0.0001" thinking it might get closer to finishing the top, but it remained the same. AND, the Machining Time was 3 seconds less on a 9 minute operation with the higher tolerance because the Machining Distance in the Simulation Statistics tab showed 10" LESS distance, which probably would've left material like what you've experienced. Not only that but the time to calculate the operation and file size was significantly increased with the unnecessarily higher tolerance.
I think it may be important to note that 3D Adaptive operations are "smart" in that they typically won't allow you to violate the model even if you have settings that would otherwise let it, whereas 2D Adaptive operations MAY violate the model (excessively machine into the part you're trying to make) which you'd only find out in the later finishing operations. I could be wrong but that's my understanding of it from webinars I've participated in.
Fusion