Originally Posted by
samualt
500ipm is extremely fast. I'm trying to set mine about 100ipm.
Nema 42 Big Honking Motors:
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Desired IPM (Inches Per Minute): 100
Motor RPM: 2000
Torque (oz/in): 1500
IPR (Inches Per Revolution, Assume 1" Pinion for Rack) = 1*PI = 3.14159265" per revolution
RPM Needed = Desired IPM / IPR = 31.8309887
Reduction Ratio = Motor RPM / RPM Needed = 62.83
Torque after reduction = Torque * Reduction Ratio = 94247.7795 oz/in (which really doesn't mean much as long as it isn't too low).
Actually, I may try for a reduction ratio of 40 or less. But the above will give you the basic idea. I think I'm calculating it all correctly. Once you get the Reduction ratio you can pick your gearbox or pullys/teethed-belts. For pullys just divide the number of teeth on the big gear by the number of teeth on the small gear.
72 teeth Pully/10 Teeth Pully = 7.2 Reduction Ratio (Use two sets and your in the ball park! 7.2*7.2 = 51.84 Reduction ratio)
Ummm, I could be wrong about everything here!
:rainfro:
P.S. Did I mention that the pinion size is always going to be 1". That is the smallest you can get. Getting a larger one, considering your reduction ratio, would be insane, IMHO.