I’m about to start my CNC using stepper motors I got from an old epson stylus c45 printer. These have 7.5degree resolution, is that enough when I paired them with easydriver (sparkfun). Thanks!!!
Sorry I can’t help you but I am Interested in what you are building. I have seen a lot of questions about using printer steppers and cant think of what could be built with such small motors other than a 3d printer. So what is it that your building?
To let you understand, to me CNC is something bigger like a router or milling machine type thing.
Depends on your lead screw/belt/whatever you use to drive the linear motion. For instance an m10 threaded rod advances about 1.5 mm for a single full rotation. So if 360 degrees moves 1.5mm, then 7.5 degrees seems plenty accurate enough. Assuming there is enough power etc.
I think the torque of the little Epson steppers is not high enough to move the weight of the spindle. The steppers out of my old Stylus C64 are weak - I can stop them with my hands. It could work for a foam-cutter, 3D printer or so. I think it would be better to start with cheap NEMA17 steppers (or bigger) if you want to move spindle and linear drive with precision and without lost steps.