I know there have already been a few threads about this, but I’m adding another in hopes that Onefinity will take a closer look. I’m having persistent problems with round pocket accuracy, and at this point I’m fairly certain it’s not a toolpath or setup issue.
The issue:
I was cutting a simple challenge coin pocket today—a 0.75" diameter round pocket at 0.15" depth. No matter what I do, the pocket consistently comes out undersized.
I’ve tested just about every variable I can think of, including:
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Climb vs. conventional cutting
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Offset vs. raster pocketing
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Multiple passes and varied cutting strategies
I’m roughing with a 0.25" end mill, and the result is always the same. The coin only fits if I draw the pocket as 0.91" instead of 0.75", which obviously shouldn’t be necessary.
At this point, nothing I change in the toolpaths makes any difference. This feels like a systemic round-pocket accuracy issue, not a CAM strategy problem.
For clarification, I have:
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Measured the bit diameter with a micrometer
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Verified the correct bit diameter in the software/tool database
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Confirmed it’s a pocket toolpath (so no “inside/outside vector” confusion)
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A consistent maintenance routine as recommended by Onefinity
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Never needed to tram the machine before
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Never calibrated X/Y via MDI (didn’t know that was a thing)
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Not calibrated X/Y in general
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Noticed this issue starting around June after a firmware update (approx. two updates ago)
Is anyone else seeing this behavior, or can Onefinity explain what might be causing such a large dimensional error?