1. MECHANICAL ADVANTAGE
   = OUTPUT TORQUE / INPUT TORQUE
2. OUTPUT TORQUE
   = INPUT TORQUE x MECHANICAL ADVANTAGE
3. INPUT TORQUE
   = OUTPUT TORQUE / MECHANICAL ADVANTAGE
4. GEAR RATIO
   = NUMBER OF TURNS OF INPUT / NUMBER OF TURNS OUTPUT
5. EFFICIENCY %
   = OUTPUT TORQUE x 100 / INPUT TORQUE x GEAR RATIO
6. NUMBER OF TURNS TO CLOSE
   = GEAR RATIO / 4
7. H.W. RIM EFFORT
   = INPUT TORQUE x 2 / H.W DIAMETER
8. H.W. DIAMETER
   = INPUT TORQUE x 2 / H.W. RIM EFFORT
9. FOOT POUNDS TORQUE
   = INCH POUNDS TORQUE / 12
10. INCH POUNDS TORQUE
    = NEWTON METERS x 8.849

TO DETERMINE THE HAND WHEEL DIAMETER KNOWING THE OUTPUT TORQUE AND THE DESIRED RIM EFFORT CALCULATE AS FOLLOWS: DIVIDE THE OUTPUT TORQUE BY THE MECHANICAL ADVANTAGE AND MULTIPLY BY 2 THEN DIVIDE THE RESULT BY THE RIM EFFORT YOU DESIRE.

TO DETERMINE THE RIM EFFORT FOR A GIVEN OUTPUT TORQUE AND A KNOWN HAND WHEEL DIAMETER CALCULATE AS FOLLOWS: DIVIDE THE OUTPUT TORQUE BY THE MECHANICAL ADVANTAGE AND MULTIPLY THE RESULT BY 2 THE DIVIDE THE RESULT BY THE HAND WHEEL DIAMETER.

Last revised on 1/1/01.