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QT2DD Making massive cuts when machining internal arcs.

Posted: Tue 02 Sep , 2025 11:31 am
by MAX THE MILLER
I produced the attached drawing using QT2DD (I zipped it because the forums won't accept .lcmfiles)

I then used the CAM Wizard to generate GCode in an .fnl file which is also attatched.

When I simulate running the code using QT2DD the internal turning tool makes a massive cut which would undoubtedly stall or damage a real machine.

The machine tooling and machine materials setting check out OK.

Re: QT2DD Making massive cuts when machining internal arcs.

Posted: Tue 09 Sep , 2025 12:37 pm
by Denford Admin
Hi Max. Thanks for this. I'm currently investigating. If the slight convex arc is set to be a line or a concave arc, the plans seem to be correct. It is internal convex arcs that are not being converted into step moves first.

Re: QT2DD Making massive cuts when machining internal arcs.

Posted: Mon 15 Sep , 2025 13:27 pm
by Denford Admin
The issue is if the is a convex arc as the first item on the internal cut. If it leads in with a linear line first, no matter how small, the arc will be roughed out correctly. We are checking further.