I began by measuring the sizes of what I already had, a 1/3 hp 1750 rpm electric motor and a 25:1 geared speed reducer. Then I took a rough cut at the MoM-20 H-frame and placed the motor and gear box on it. Lining up the pulleys, drilling holes for the mounting bolts and making sure the belts would clear everything drove the design.

You don't see the dimensions. These are given at the time you add a part. Clicking on any part will show the dimensions and locations and let you edit them. It is almost time to start cutting wood.

Designing the base box was a little easier. Starting with the original M-o-M 20 dimension, I just needed to make sure the pulleys could be lined up and have clearance for the pulleys and belts. Of course you also have to keep in mind that the powerhead is going to slide around when the pulleys and belts are changed. In the end, I need to make the height 15-1/2 inches. The footprint is 30" x 30".

There was one area I was deficient in. I did not imagine what it would be like to have to reach through a maze of belts to get to the underneath side of a pulley with an Allen-head wrench to get to the set screw.