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Hello, Today I decided to try and define some NPT threadmills using the "threadmill" option in Mastercam 2018. Previously I have defined my NPT threadmills as a "taper mill". This allowed me to define the tool in the exact shape as real life. I have been doing it this way for about two years with great success, everything makes sense and the code is good. When I tried to define the same tool as an actual "threadmill" in Mastercam things started getting funny. I was able to define the tool to match exactly so everything looked good, When I toggle the toolpath display on I would expect both the old and new toolpaths to be identical. In reality when I use the tool defined as an actual "threadmill" the toolpath cuts undersize, by a lot. If anyone could have a look and provide some suggestions that would be great. - Colton NPT THREADMILL TEST.ZIP
