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50mm pitch?

What is the actuator - do you have a picture?  If it's only doing it in one direction there may be an issue with the actuator or related mechanicals.

A cursory look through the manual (I think it's the right one) looks like the MR-J3-100B can also take +10v/-10v analog input control.

If so - and you'd better make sure I'm not way wrong - you could use a Mesa analog board to control it.

On the other hand, if you're using step/dir for you other drives new servos are getting so cheap it might make sense to just buy a new one and fit it up.

Side note - when I put a servo on my 4th, I found it extremely helpful to have a very precise home-to-index function.  Really cuts down on the typical fiddling getting a trunion table or vise dialed in.

Whatever servo you wind up with, try to ensure it's got an encoder index signal output, and you've got a couple free inputs (one high speed and one for a home proxy).

Greetings,
is there any "python" programs or solution for generating g code with custom shapes,
square triangle circle like

thanks