I have a motor that rotates at 1800 RPM at 60 Hz. It then runs through a 15:1 gearbox that spins a 4" work roll. How do I calculate the FPM of the work roll based on different frequencies and work roll diameters? I not only want to know the formula, but also how the formula is derived. Its been driving me crazy!!!
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Re: Convert Hz to RPM to FPM
Originally posted by John Young View PostI have a motor that rotates at 1800 RPM at 60 Hz. It then runs through a 15:1 gearbox that spins a 4" work roll. How do I calculate the FPM of the work roll based on different frequencies and work roll diameters? I not only want to know the formula, but also how the formula is derived. Its been driving me crazy!!!
Each revolution advances the work the circumference of roll, pi*d
4" = (1/3) ft so
120 rev x pi x (1/3) ft/rev = 40*pi ft/min ~ 125.66 FPM

Re: Convert Hz to RPM to FPM
Originally posted by John Young View PostOK, thanks, but how does that equate to Hertz?
The electrical field rotation rate is 60 Hz times the number of pole pairs (poles/2) times 60 seconds per minute, for two pole winding 3600 cycles per minute, for four pole 1800 cycles per minute.
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