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Old 10-11-2008 | 07:49 PM
  #1371  
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liljohn1064
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Originally Posted by liljohn1064
Which one is closest to my number of 1 1/8 inches center to center?
I may have answered my own question. Someone tell if what I found is right or wrong please?

Diameter = D, P = Pitch, N = Number of teeth.

D = N/P

Radius = D/2

I calculated the radius of the Spur, the radius of the pinion and added them together. I have about .125 inches of play either way by sliding the motor in its mount, so my final number just needs to end up between 1 and 1.25 inches.

My starting point should be a 90 tooth spur and 53 tooth pinion.
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