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General Mach Discussion / Second Mill of a rectangle is not accurate

« on: June 14, 2013, 07:08:06 AM »

Hey,

I'm new here and maybe in the wrong section but I searched a lot in this forum and could not find a better place to put my question on.
I have a mach3 (latest version Mach3 R3.043.066) installed and configured.

I draw a simple rectangle (200x200mm) in Cut2d and export the path as a Mach3 file (mm).
The rectangle has a depth of 4mm. Cut2d is set to 2mm per cut with a 3mm mill.

Now my problem:
First rectangle (2mm in the first mill) is OK (dimension). The second turn, the rectangle is not accurate at all. The second mill has an offset of about 1mm in X and Y.

I can say that it's not a mechanical issue because if I cut with another Tool (WIN-NC) both cuts are at the exact same position.
What i found out is that this is some how related to the cutting speed.

If i cut with 4mm/s the second cut of the rectangle is too wide.
If I cut with 8mm/s the second cut is too narrow.
With 6mm/s the second cut seems to be fine.

Does anyone have an idea what could cause this strange behaviour on mach3?

Thanks for your answer

Regards
Chris