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Nick Müller
 
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F. George McDuffee wrote:

it is difficult to identify.


If it's difficult, then it might me the description. :-)

One way:
m = do / (t+2)

with: m = module; do = diameter (outer), t = #of teeth

Or the other way (with two meshing gears):
m = dist * 2 / (t1 + t2)

with:
dist.: distance between axles
t1, t2: # of teeth of gear1 & gear2
m: module


Nick


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