Just a follow up.

For the moment the problem is solved. Though not sure if entirely, as i have many wood jobs , so no time to play with fine adjustments. But wood is fine.

Reason was bad servo tuning. It seems it was a mistake to rely on the autotuning function. So it was undershooting . When positioning the Z. And the gantry also. Symptoms were you move it to position and when it stops there was a further fine adjusting movement. But as it is my first servo machine, i thought that normal.

So i still do not understand very well how to fine tune the parameters one by one, even if i read a lot of info on internet. However luckily Samsung servo has 3rd method as seen on last document above. Just raising the gain, so all else auto adjusts some how. factory was 20, 50 is for rigid machine, 100 is max. So i made the Z gain 75 and now is snappy as a bullet from new AK47.

All other axis are set to 50, and i am still testing if to raise that or no.


I still have to understand if TR=on/off is set right, and how to change it exactly from the servo software. I guess as the machine is rigid, motors and acceleration are calculated correctly, gain is set correctly, if problems still persist then that would be the solution. Unfortunately Pokeys does not support differential.

Truth is i wanted to know better that cheap board for my future projects, otherwise i would have installed CSMIO already. But it seems handles things well for now. Some small quirks but that's Mach3 .