I have a ramps 1.4 with 4 stepper drivers one of my z motor's doesn't work it grinds I tried rewiring it and still grinding, I also tried swapping the x and y axis motor and they both work fine when connected to the z axis sockets. Connect 5 motors up and one grinds and always on the z axis. The nema is not turning even when ran unmounted.
I decided to replace the motor so I bought 2 brand new nema 17's (Prewired) swapped both motor's on the z axis and still the same grinding on the z axis on the new motor. So I swapped some of the working motor's and still the same grinding on the z axis only. I played with pot but no luck.
I've bought a new ramps 1.4 board and 5 stepper drivers off ebay so I'm hoping a straight swap of the ramps and steppers the problem will go away. Has any one else experienced this? I'm assuming I have a dodgy stepper driver but replaced the ramps board as it was cheap and had the 5v pins for the endstops which mine lacks.
[Solved hopefully] traced the motor not working to a bent threaded rod on the z axis it was binding stopping the motor's turning, I ordered 2 lead screws last week to replace the z axis (Upgrading the chassis a Graber I3) so hopefully they will arrive tomorrow not expecting the Graber frame till next week.
Oh well I've got 2 spare nema 17's, ramps 1.4 and steppers sure I can find something interesting to do with them like build another printer lol. Ordered another adruino mega 2560 from Hong Kong for £6 so will have spares
Edited 1 time(s). Last edit at 04/12/2017 08:19AM by Desertboy.
Today I stripped the z axis down and found it wasn't even close to aligned and that what was bending the threaded rod (I didn't build this printer) I straightened the chassis considerably and use new threaded bar and it all works fine. I think my motor couplings need replacing though as they seem slack and the threaded bar dropped off one of the z axis. I got my lead screws today but decided to hold off fitting them until I get the Graber frame which should be early next week they stick through the bottom off the mendel too far and I would have to raise it I think I will have to cut them down for the Graber.