When designing a belt drive, the load being transmitted is
one of the most important pieces of information that is needed. To properly describe the load, there are two
key pieces of information: HP and RPM, or Torque (Q) and RPM. RPM is important in either case to quantify
the load. Believe it or not 10hp at
1000rpm is not a very high load compared to 10hp at 100rpm. Here are the equations that relate one to the
other:
This is for torque in in*lbs
HP = (Q x RPM) / 63025
Q = (HP x 63025) / RPM
This is for torque in ft*lbs
HP = (Q x RPM) / 5252
Q = (HP x 5252) / RPM
If we use the example above, the torque for 10hp at 1000rpm
is 630.25 in*lbs, where the torque for 10hp at 100rpm is 6302.5 in*lbs, a
pretty big difference for your belt drive!
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