Hi all,
I've got a slight issue with one of my axes and I was hoping to see if I could get some help here. Any advice would be greatly appreciated. I've got a problem where my stepper motor stalls. Current spikes up to about 1.5A and I hear a loud rattling, but the ball nut goes nowhere.
A pic of my setup:
http://www.cnczone.com/forums/attach...d=359902&stc=1
http://www.cnczone.com/forums/attach...d=359904&stc=1
Stepper motor info:
Rated current: 1.7A
Winding inductance: 3mH
Rotor inertia: 51gcm^2
Bench supply voltage: 24V
Ball screw info:
Diameter: 16mm
Pitch: 5mm
Software:
Arduino + gShield running grbl 0.9
From what I understand, a stepper motor with these specs should be able to drive this ball screw with no load rather easily.
Things I've tried
- Replacing the ball screw
- Checking sections of the ball screw to see if there are sections with more friction (letting it stall and then manually rotating the screw to see if there are rough patches) - but there seems to be no consistent position where the ball nut gets stuck
- Reducing feed speed (tried speeds ranging from 250mm/min to 500mm/min)
- Loosening up the assembly (to give room for components to move around slightly in case of some over constraints)
Not quite sure what to do here at this point.
PS: please move if this is in the wrong sub.