When I move the Y-axis above a certain speed (11000mm/min), both motors stall at the same time. They accelerate and then make a horrible sound. I can live with lower speeds but now I want to know if this is normal or why this is happening.
- If I connect the X-axis motor to the Y driver, I can move it at F30000 easily, so there's no software/driver limitation
- I removed the gantry to reduce load to the minimum and I loosened the wheels. The speed limit stays constant and both motors behave the same way.
- I use beefy NEMA17s (2.5A per coil, probably a bad purchase decision!), but increasing the current of the driver (up to 2.5A total) has no effect.
I have a (e)ShapeOko with ramps1.4 running Sprinter (similar to Marlin) and both drv8825 and a4988 produce the same results. Tried 1/4, 1/8, 1/16 and 1/32 microstepping. 12V PSU.