My cuts do not seem to be smooth. On circles, the problem is mainly at 10 and 4 o’clock. Also seems to be on my y axis. more so than my z axis.
I have performed all the normal tests, backlash, steps, etc.
This is a DIY build and my geometry seems to be spot on.
My Y axis is driven by a single motor with a shaft that runs the length of the Y axis.
Could the coupler cause this type of issue?
Any help would be greatly appreciated!
I’m always suspect about those…
In reality, I doubt it, since it would have to be on ‘some’ multiple of the circle.
If the coupler makes 1 revolution to the X moving around the circle, then maybe, but doubt that’s the case. Not that it couldn’t be an aggregating factor.
If the geometry is on, then that only leaves some type of mechanical issue.
The hardware and software has been beat up pretty well, so I’d look at other mechanical issues. Belts, loose screws…
It almost semed lke the two Y sides were fighting each other. So i wrapped the couplers with tape, to minimize or dampen any torsion effect, and to my surprise the problem went away.
Going to swap out the couplers with a different type.
I suspect the main culprit was the middle coupler, as that divides the two sides. I might just replace axle with a single instead of double.
I had a couple of those on my CNC3018 I modified. They would never hold any kind of accuracy, although I see them on all kinds of stuff.
Some of these machines seem to have 2 steppers, one for each end of the shaft. Seems like a problem waiting to happen, but whatever works.
Can’t seem to find a shaft longer than 700mm. Need a 1000mm x 8mm
I guess you didn’t get the shaft… 
Usually that’s a good thing… I’ve gotten so much stuff that didn’t fit, I have a junk box of it…
i don’t know if there is tha same in you Amazon but…
https://www.amazon.it/TRAFILATO-CUSCINETTI-BRONZINE-diametro-lunghezza/dp/B077K1NXLF/ref=pd_bxgy_1/257-9810447-5559422?pd_rd_w=3e8Rf&pf_rd_p=cfeaf550-9f5f-483e-bd28-a83e8ccd8083&pf_rd_r=KR0F0A100G1PP7GZ1RWR&pd_rd_r=2daaec9a-832e-41d3-8fde-2ba9d22b1779&pd_rd_wg=5aTL6&pd_rd_i=B077K1NXLF&psc=1
in Amazon.com i’ve found this
What was the solution?
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