Originally Posted by
NIC 77
5/16-18??
Am I reading this correctly? I'm not experienced with lead screws. The only one I've used came already assembled as part of a linear slide, and that one had a lead of 0.25". So that's 18 treads per inch, single start? Or 1.4mm per rev?
If so, that there is your biggest problem! Steppers deliver most torque at slower speeds. You might think a lower pitch is better, but when the machine is moving faster, the stepper is now also moving faster and will have less power as a result.
I've recently done analysis including inertial effects for my own build with ballscrews. I was surprised to see how much better the 10mm pitch out performed the 5mm pitch in the speed range I want to use. And you're using 1.4mm pitch? Or is that a misunderstanding on my part?