They are actually limited by the controller itself. So the controller will only ask the driver to make moves up to a certain speed. Then the driver converts those requests to electrical signals that get sent to the motors.
Theyâre limited by whichever thing is slowest.
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An 8-bit GRBL controller can output a maximum pulse rate of about 30,000 steps per second
- This means that if you have a high steps/mm value, youâll have a lower maximum speed you can reach. (yours is 80 steps/mm, so in theory, you could get to 375 mm/sec)
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Stepper motors themselves will have a maximum RPM for a given voltage. If the above speed causes the steppers to spin above this RPM, you wonât be able to go that fast
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Stepper motor drivers can usually handle 100,000 steps per second or more - the spec sheet for the chip on the driver should probably tell you this, but theyâre rarely the limiting factor.
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