- Finishing Pass Problem:
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Re: Finishing Pass Problem:
Hi Bruce, I think it may be that the algo in your CAD/CAM that generates the coordinates, which are I think incremental (?), for some reason is generating a Z coordinate that has a small and varying error. I'm surprised that it is not just generating G02/3 commands that produce circular interpolation, but seems to be approximating circles with short chords generated by G01 moves.
I would be inclined myself either to write an Excel sheet that will generate the g-code for using circular interpolation; or using Excel to clean up the coordinates such as you list above, so that for each segment that ought to be at a fixed Z level it replaces each Z value with the mean of all the Zs in the segment. I would have more confidence in the first as one has more control, but you need to understand a bit about how to construct g-codes in Excel.
One thing that might work is to actually loosen the tool tolerance so that it is larger than the Z variations - that might persuade the CAM to generate a constant Z level.
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