Step How to Select Speed Reducer
Step 1 – To determine the best auxiliary drive ratio to use, first multiply the maximum machine speed by six.
Step 2 – From the reducer selection charts listed in the Gear 700 Series catalog, select the next lower maximum operating speed listed.
Step 3 – Divide the maximum operating speed by the maximum machine speed to obtain the proper auxiliary drive ratio.
Steps 4 – To calculate the torque of the speed reducer to be selected, divide the machine torque by the auxiliary drive ratio* you found above in Step 3.
(*Remember: Efficiency should also be included in output torque calculations. Use the following formula:
Output torque = input torque x ratio x efficiency.)
Example:
• Output torque of speed reducer: 500 in lbs.
• Ratio of chain drive 3:1
• Approximate efficiency of chain drive: 95%
OPT = 500 x 3 x 95% = 1425 inch pounds
