Optirough crashes into defined stock

[Programinator]

So i have a stock model that i am referencing in an optirough toolpath.  I can't get the path to not plunge down into the stock.  As you can see from picture.  It plunges down at start of green arc and then feeds on the yellow.  I have all the settings correct and mastercam should be able to do the leading with plenty of space off the stock.  but it will not do it..  Why is this doing this.  I ran the same toolpath on a mirrored part and it worked fine.  Any suggestions?

[Chally72]

Any chance you could post the file?

[Programinator]

6 minutes ago, Chally72 said:

Any chance you could post the file?

I wish i could.  Not allowed.  As you can see the first move plunges down on stock.  I know the settings i have should work.  have done it a bunch of times the same.  I even tried additional offset on the stock model and it keeps doing it.

[PNW_MFG]

Where is your boundary chained form? What is your helix radius? Do you have plunge only turned on by accident?

[Chally72]

I took a look at the file for Programinator. This looks like a unique issue with concave part geometry which is causing a reverse leadin/leadout curl back into the stock volume, that is then not trimmed properly to avoid the plunge gouge. Tolerances/boundaries/stock model/entry settings/tools/skip pocket settings are not at fault here. I sent it on so someone can take a look and see what's actually happening.

[PNW_MFG]

14 minutes ago, Chally72 said:

I took a look at the file for Programinator. This looks like a unique issue with concave part geometry which is causing a reverse leadin/leadout curl back into the stock volume, that is then not trimmed properly to avoid the plunge gouge. Tolerances/boundaries/stock model/entry settings/tools/skip pocket settings are not at fault here. I sent it on so someone can take a look and see what's actually happening.

Interesting. I have seen a fair amount of opti-rough issues, but that sounds like a first.