[gateman]

I have a sx3 with the cnc fusion kit. When I cut inside profile circles, instead of cutting one continuous circle it stops four times. As if it's dividing it into four arcs. I'm using cut2d and Mach 3. Also, somehow my machine got put on cv mode and I don't know how that happened. Is there any other way to change the mode without going into the settings?

Thx,
Rod

[gateman]

Anyone??

[holbieone]

In the x,y plane

When cutting a circle their is four axis reversals, two for x, two for y

My guess is you are seeing the machine adjust for backlash at each axis reversal

[gateman]

That makes perfect sense. Thx!

[Leous]

Hi, I also have an SX3 that just recently converted to CNC and am seeing the same issues with circles (arcs), I don;t know if it is a mechanical issue or a Mach3 issue. The tolerances between the straight contours in some of the pockets are good +/- 0.02mm but when it comes to doing circles, arcs, ellipses or anything round there is something really wrong. The error seems to be symmetric or when there is a change in direction but in different quadrants (1-3 or 2-4), I replaced the stepper couplings to helical zero-backlash with no luck, still see the same issue.

Please any recommendations??? I have attached photos.

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