Rotary help with multiple passes being offset

[LaserCuttingPro (Neil)]

I have bought a new rotary for my Fibre laser. I have been using rotary on my Co2 lasers no problem, with multiple passes always lining up.

This new rotary works fine until you want to do another pass and then the positioning is off very slightly, and again the same distance off every time you run the pass again.
As you can see in this close up 3 passes and each pass has moved.

the origin of the rotary was always set to 0, with return to origin “on” in the settings.

Each pass was for adding different effects to different areas, but they did not line up,
Does anyone have any idea why?

this is the driver, is set to 32/6400. seems a bit low?

Many thanks.

[Albroswift (Al Fernandez)]

Maybe slow down your acceleration (Larger number) possibly slipping or jumping?
Does not look like a very high quality microstep driver. What is the Current setting? What rotary did you get? If it is a big chuck type need current in the upper ranges.
Sorry not going to be much more help then that.

[LaserCuttingPro (Neil)]

It’s an 80mm chuck rotary.

I have ordered a new motor driver from cloudray just now as I also feel the one in the machine looks a bit unfit for purpose.

It is set at 6400.

[Albroswift (Al Fernandez)]

Any respectable microstep driver for a galvo should have 7 dip’s, #4 sets holding amperage 50% or 100%, and should go up to 20000? instead of 6400. 12800 is a good starting setting, unless you have a ratio reduction rotary, I run mine 6400 with a 6:1 belt drive reduction unit.

[LaserCuttingPro (Neil)]

There is no belt reduction, it basically connects direct to the stepper motor

[Albroswift (Al Fernandez)]

Yes so 12800 is probably where you want to be.