I've done some homework on stepper sizing for my laser build.

In brief for single axis mounted on gantry:
Weight of moving parts roughly 500gm. (used 700gm in calcs)
Stepper drive pulley (GT2, 20 teeth, approx 13mm diameter) direct to linear belt. No other ratio adjustments
Axis travel on 2 x parallel 12mm round guides with 70mm long linear bearings
Expected feedrate 600mm/s at 0.1sec acceleration and deceleration.

I thought I would be pushing the limit for a Nema17.

Plugged my data into an online calculator: Belt Actuator Sizing Tool

Long story short, the estimate is showing 0.12...... N/m of torque. If conversion is correct this should be roughly 1.2kgf/cm? Maybe I haven't used a large enough friction coefficient or something.

But I was expecting to need a higher torque stepper based on some very rough calculations a few weeks ago.

Does this sound reasonable? Or will a stepper capable of 1.2kgf/cm be insufficient?

Thanks in advance for any advice

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