Select the Power Frequency:	30 Hz 40 Hz 50 Hz 60 Hz 70 Hz 80 Hz 90 Hz 100 Hz 120 Hz
Select the number of Motor Poles:	2 poles (3600 RPM @ 60 Hz) 4 poles (1800 RPM @ 60 Hz) 6 poles (1200 RPM @ 60 Hz)
Select the Motor Slip:	0% 1% 2% 3% 4% 5%
Sheave 1 Diameter (Motor):	1" 1.5" 2" 2.5" 3" 3.5" 4" 4.5" 5" 6"
Sheave 2 Diameter:	1" 1.5" 2" 2.5" 3" 3.5" 4" 4.5" 5" 6"
Drive Wheel Diameter:	2.5" 3" 3.5" 3.82" (1 ft per revolution) 4" 4.5" 5" 6" 7" 8" 10"
PLEASE MAKE SELECTIONS ABOVE TO COMPUTE MOTOR AND BELT SPEEDS

Notes:

In North America, Power Frequency is 60 Hz; Europe/Asia 50 Hz*. For VFDs you can choose any selection between 30 and 120 Hz.

Motor slip varies with motor type and loading. Use 3% if you are unsure.

If using a direct drive wheel, leave Sheaves 1 and 2 the same diameter. (Ratio of 1:1)

Looking for a great VFD for your DIY 2x72" Belt Grinder?