208OZ.IN stepper motor

[Robin Hewitt]

my plan is to use chain a sproit to run the x and y axes they will run on channels and v pulleys.

Chains are good, I suggest 1/4" pitch and at least 2" sprockets to keep cogging down. Not so keen on channel and Vee pulleys, presume you are worried about dust getting in to bushings.

A 2" pulley would move you about 6" per rev (pitch x teeth). That's about 0.015" 0.38 mm per half step.

Gear it down 2:1 and you have 0.0075" 0.2mm per half step. Then quarter step for 0.1mm resolution, sounds good for a plasma cutter.

Being 1" radius the 208 oz.in motor would give you 208 oz of pull direct drive. 416 oz, 26 lbf at 2:1 down.

Guesstimate 2lbs of rolling resistance with some better bearings, leaves 24 lbf to move it.

4 rps on the motor would still have plenty of torque and get you rapids at 1 ft/s.

Let's assuming the gantry and chains weigh 32 lbs. 1 lbf will then accelerate them at 1 ft/s/s.

24 lbf will accelerate them at 24 ft/s/s. Equivalent of 0 - 60 in under 4 seconds, it's a motor cycle.

My maths is not guaranteed any more, brain aging rapidly :naughty:

[whensparksfly]

so you think my setup with theses motors will work for me.
i just want to say thanks so much for taking the time to explain it to me .