1200mmX900mmX170mm 4axis cnc

[Desertboy]

I read Boran's thread,very good I must say.
If I understand correct ,for someone who uses two stepper motors at Y axis,like me,you can not slave one of the motors and save an exit for future use for a 4th axis,right?

Can't you just run the Y axis step and dir to 2 stepper drivers?

Sure there's no dual homing but with AM882's once it's square the stall protect will tell if you if it's out of square although keep an engineers square next to the gantry and it doesn't take long to calibrate.

[Clive S]

the stall protect will tell if you if it's out of square

This is not true. You could be out of square say about 5mm and the two motors would still run also stall detect as I understand it does not work below about 300rpm