The only replacement pulley for the y axis stepper motor I can get is 19mm diameter against the original pulley of 12.5mm
Is there any way to adjust for this in Lightburn?
Or any information where I can get the correct size would be appreciated
Thanks
A different pulley diameter will change the GRBL step/mm value for that axis, so you must make that match reality. You can get a close approximation by multiplying the existing value by 19/12.5, then calibrating the actual results:
With that value updated properly, everything else will Just Work.
However, a larger pulley may not fit the existing space and will definitely change the belt path, which may then rub another part of the machine.
Timing belt pulleys are most often measured by the number of teeth around the circumference, so count 'em up and go through the Amazon listings:
https://www.amazon.com/s?k=gt2+pulley
Make sure you get the correct bore diameter to fit the motor shaft, because that’s really hard to fix after the fact.
Thank you for the quick response. Appreciated.
I have had a look on Amazon and have sourced the correct pulley.
The only difference I see is that when I measure the belt it seems to be 7mm wide but the pulley shows it for for a 6mm width belt. I take it this ok?
Absolutely not!
If the belt is wider than the pulley, the edges will shred almost instantly.
Perhaps the machine has an inch-size belt, maybe ¼ inch = 6.35 mm, in which case the tooth pitch will also be hard-inch.
I assumed your “engraver” used standard metric GT2 (-ish) belts, but if that’s not the case then you must figure out which pulleys match the actual belt.
It is unusual for a pulley to need replacement. What’s the rest of the story?
thanks for the help I have followed your advice and have sourced a suitable fully from Amazon/China.
The y axis stepper motor has given up the ghost. The pully is fixed on so tightly that it will not come off.
That’s also unusual, because stepper motors have no moving parts other than the rotor.
Have you tested the motor using the X axis stepper driver? If it moves at all, then suspicion falls on the Y axis driver, rather than the motor.
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