QT2DD Making massive cuts when machining internal arcs.

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MAX THE MILLER
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QT2DD Making massive cuts when machining internal arcs.

Post by MAX THE MILLER » Tue 02 Sep , 2025 11:31 am

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.
Attachments
internal arc.fnl
(2.05 KiB) Downloaded 27 times
internal arc.zip
(3.11 KiB) Downloaded 31 times

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Re: QT2DD Making massive cuts when machining internal arcs.

Post by Denford Admin » Tue 09 Sep , 2025 12:37 pm

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.

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