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Steppers Stalling

Installed the new board, everything runs.. but whenever I go over 35 mm/s my steppers stall about 50% of the time (only on the start of the run).

I have checked and tightened the belts.. there was no issue with stall on the old board.

I am using Lightburn. I am sure its a GRBL setting, I just dont know which one, any help would be appreciated.

disregard, Im a noob.

For future reference of other noobs,

$120=50.000 (x accel, mm/sec^2)
$121=50.000 (y accel, mm/sec^2)

My stepper acceleration was set at 3000, dropping it to 2000 fixed the issue. I will play with it and see how close to 3000 I can get before I go back to stalling.

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