Hi all,
I think I am missing something simple here, I hope someone can help.

I have put together a Bear Prusa clone, kinda. Anyway, I printed some parts and assembled it mostly like a Bear. It is using Ramps 1.4 and Drv8825 drivers.

My issue is that the Y motor has some clunkiness sometimes, then the printer errors and has to reset. If I home the printer, sometimes it stops fine, then starts ticking about every second for a minute or two before needing to reset.

I have run it without the y belt and get the same symptoms.

I have swapped driver boards, both Drv8825 and the A4988. I have swapped stepper motors. I have swapped the ramps board. I have not swapped the Mega board. I have isolated the wire to the stepper so no cross talk.
I have adjusted the voltage. Changed the step settings from no microstep to 1/32. Set steps per mm to various things to account for weird missed steps.

It is only on the y. The heat sink gets hot and the motor whines.

I don't know what I am missing.
Thanks Scot

... could be EMI (Electro-Magnetic-Interference), whats causing wrong impulses on the STEP input ... would be reduced with shielding the cables ...

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Viktor
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Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]

Well I was able to figure it out, kinda.

It turned out that the Mega board was the problem. Once I swapped out the arduino clone, it started functioning correctly.
Thanks for all the views. Is there a way to close this post?
Scot