Quote Originally Posted by JAZZCNC View Post
This is common corner cutting with Chinese machines, chances are the 2 motors share just one drive has well.? Bad bad idea just asking for error and trouble.!!

First of all Mach3 doesn't support closed loop so fitting encoders won't help here. Mach will read encoders and show encoder position in a DRO but can't act or do anything other than that.
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The next option is to use the Hybrid servo stepper system which is actually closed loop stepper system but closed by the drive not the Control so will work fine with mach3 or any control that doesn't have closed loop capability's.
This system will not run out of position and will correct for positional error if it does. It works very much like a servo system but use's stepper motors with encoders meaning it keeps the cost down. ...
I have a plugin for my machine that came with it. Its for the close loop that can be added to the motors. It works in Mach3. I mean if some body needs it just drop me a PM and i will send it to you. But hushhhh !Basically you need additional inputs on the BOB and enter the correct values for the encoders in Mach3 setup.