I made a 3d printed zoetrope using an arduino to control the startup and RPM of a bipolar stepper (this one: https://www.sparkfun.com/products/9238
I am using this code: https://github.com/xtremd/Zoetrope/tree/master/zoetrope
When I originally made it, I had a CNC'd piece of plexi around the shaft of the motor and everything was working fine. This is obviously temporary as the plexi began to strip a bit so I had a piece of aluminum made for the motor shaft with a set screw (the plexi just fit around perfect on the shaft)
Now, for a reason I do not understand, the motor is unable to spin the 3d print around.
Why would a stepper work okay with a crummy plexi shaft coupling and fail with a nice aluminum coupling? Both couplings weigh around the same but the 3d print weighs quite a bit so a small weight difference doesn't seem like it would matter.
I am pretty new to steppers and they are always really confounding me.
Powering it through an ATX psu...5amps. Would more amps help you think? Does that matter?
Any ideas much appreciated!!