Andymark Planetary

[Alex.Norton]

I'm working on a design for a gear box for the CIMs that would use the gears out of the am planetary (the one for the Fischer price) and I have a couple of questions concerning it.

1. Perhaps the more important is how much torque can the gears in the am planetary take. If I were the put two CIMs worth of torque into my gear box and mount a 6 inch wheel to the output shaft of the gear box would I have wonderful grinding noises? The reduction through the gearbox will be around 15:1 and the planetary will be the last stage on the reduction.

2. The other question revolves around a disparity on the andymark site and determines a fairly significant part of my design. the site says that the reduction through the planetary is 3.67:1 and the the sun gear has 15 teeth. This would mean the ring gear has 55 teeth and that isn't acceptable geometry for a planetary. The CAD model does has a sun gear of 15 teeth but the ring gear only has 40 teeth giving a reduction of 2.67 which makes it harder for me to get the reduction I want. So if somebody who knows could tell me which one that would be very helpful.

Thanks.