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									Evaluating DC Motors




  Determining Gear Reduction
   Determine the Required Tractive
               Force
                                   Procedure
                             Load a wheeled drive platform
                             with the design weight.
                             Approximate the correct
                             weight distribution.
                             Drag the platform by a spring
                             scale attached with a rope. Try
Tractive Force = 14 lbs.     to drag level with the floor.


           ALWAYS Record, Describe and Date the Data
           Calculate the Required
                 Reduction
Tractive Force Required (lbs.)

 Design Torque (ft.lbs.
                                 =   Approximate Reduction
 Drive Wheel Radius (ft.)



      14 lbs

    .75 ft. lbs
                                 =   4.6 rounds off to 5:1

      .25 ft.


           ALWAYS Record, Describe and Date the Data

								
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