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Need Help! How to limit Z depth on rotary machining?

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So I profiling a 4th axis part using a linear motion from 1" bar stock. My machining operation is Rotary Finishing. X Zero is the right hand end of the bar stock and both Y and Z zero are center of the bar stock. Sprutcam tells the machine to plunge clear to the other side of the bar stock (or Z -0.5") every time it returns to X Zero. I assume the is to surface the face of the part at the end of the bar stock.

However, I want no more that .75" of stick out on my 1/4" end mill to reduce chatter. So I need to establish a safe Z depth for Sprutcam to use. For the life of me I can not find one. Is there a way to establish a mazimum Z depth for a rotary machining operation in Sprutcam?

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forgot to mention I'm using Sprutcam 8 on a Tormach mill (both 770 and 1100)

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