Unwanted Plunging

[G Caputo]

I am trying to rough mill the interior of a segment with the Surface > Rough > Pocket command. I am working off of a solid created in Inventor6. I have a containment boundary drawn so that it does not cut my clamps, and i am plunging outside this boundary. The problem I am having is that I am using a 5" face mill to rough out the part, but when it gets to an area roughly 18" x 8" x 3/8" deep, it continues on and plunges in that area. I can correct this problem by changing the depth i allow my face mill to cut, but i was wondering if i missed something that would not allow this tool to plunge at all. Basically what i am trying to do is face mill around islands, but i want to use the solid to do it with. Thanks all for a wonderful forum! This place is the coolest.

[Fred from Université de Sherbrooke]

After you'll try helix entry, you'll not care so much about plunge. It's so smooth...

And in helix, you can tell Mastercam to not plunge if he can't ramp.

Hope it help