10mm belt nema23

[JAZZCNC]

The 48V PSU will make a difference. Try with 4.5A but check the motors temperature, if they'll get too warm or hot, reduce the current. Higher current increases only the low speed torque.

Yes it will make a difference it will blow the bloody drives up.!!! . . . . Why do you people give advise without looking and knowing exactly what your telling people to do.? These drives are 50V Max and 48vdc is far too close to limit and when traveling at high feeds the back EMF will fry the drives.

Kev stick with your current supply for now. I suspect your problem comes from lack of pulses due to high micro stepping with low pulse rate.
Setting lower micro stepping won't cause stalling and should allow higher tuning of velocity because less pulses are needed.
3200 is too high and pointless really because most steppers can't resolve higher than this. What it does help with is smoothness but this comes at the cost of high number of pulses which can lower your velocity if can't provide them. If using parallel port with 25Khz then this will most likely be your problem.

I've seen you mention 10mm but is that width or pitch.? T5 is 5mm pitch not 10mm. So with 20T your linear Pitch will be 100mm per rev.
Now given your using 3200 pulses per rev and using frequency of 25Khz which is standard frequency for parallel port the max RPM you'll get from your motors is 468.75Rpm.
This is calculated by taking frequency and dividing by pulses per rev or micro stepping in your case. This will then give Revs per Sec which you times by 60 to give RPM.
Now take the pitch and times by RPM to get max velocity. So 100 x 468.75 = 46,875mm/min or 781.25 mm/sec .

So you see if using 25khz with 3200 MS and 5mm pitch with 20T you can't possibly be reaching 800mm/sec.

Drop the Micro stepping to 1600Ms and your RPM doubles and so does your Max velocity. Lowering Ms won't or shouldn't cause stalling motors. Unless your trying to spin them too fast.?
By this I mean say if you used same parameters as above but with 400Ms then you could possibly tune the velocity so that the RPM is higher than the motors can handle so get saturated. Above 1500Rpm then steppers motors will struggle depending on load voltage etc.