The main profile of this piece should be smooth but it has subtle ridges in it. It was cut in a spiral so ridges could be caused by an error in moving Z. They’re not cusps, and they sometimes seem to align with features on the face. NC file is attached not sure if you can see it.
Your screenshot is the spiral pattern, which is seemingly very smooth, right? Just making sure I understand what you mean.
You’re thinking it’s lost steps due to friction in the Z-axis slides? or friction in the leadscrew nut? or friction from the endmill?
This is a 1/8-inch ballnose in dry white pine spiraling from outside to inside with 0.15mm stepover. Doesn’t seem like it would have difficulty cutting right?
If it loses steps, will the stepper motor make the typical loud noise when the step is lost?
Tomorrow I will do another spiral job with and without those two little divots. I suspect dipping into or out of the divots, for whatever reason, makes the Z position slightly incorrect. That still doesn’t explain all of the ridges but curious to find out what’s up.
Mmm seeing steps could drop due to a loose motor connection or bad motor https://www.reddit.com/r/shapeoko/comments/r707tw/hey_guys_having_i_think_a_missing_steps_problem/ – will run it again tomorrow anyway.
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