The help says that this should be the thread depth or difference between major and minor diameters, so I changed it to 0.7112mm ( 4.1656mm OD for #8 minus 3.4544mm tap drill size). I then saw the "Pitch Diameter Offset" value which was set to 0. This is how that looks in the simulation: But the thread milling operation just lowers the tool into and raises it out of the hole in a spiral motion without cutting, it seems to just touch the walls of the hole with the edge of the cutter. The diameter of that (about 3.4mm) seems correct according to Wikipedia's tap drill size list. What I get when I run this, both in the simulation as well as on the machine, is just a hole from the bore operation. I set this up in CAM as a bore followed by a thread milling operation. I configured a custom thread milling tool, more on that below. I first created a hole and then applied the thread tool to that with these settings: I'm trying to cut #8/32 threads with this thread mill:
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