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Originally Posted by Arefin Bari
The thickness for the gears are .25". I suggested him to make them .375". As far the pitch of the gears go... Matt will answer that. There are no 20 tooth gear in that transmission. He is using 3 15 tooth gear and 3 60 tooth gear. Each sprockets has 16 tooth.
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Are you sure about the 0.25" thickness for the gears? Compared to the front plate of the CIM (which is definately 0.25"), they seem smaller. Maybe Matt changed them without posting an updated picture? Depending on the material, I think that these narrow gears could be made to work for the first (higher speed) stage; it's the second stage that will fail first.
And as for 15 vs. 20 teeth, 15 just makes things worse! (Higher stresses on the pinion, and depending on the pressure angle of the gear, the potential for some significantly undercut teeth.)