I’ve got this datasheet for a geared bearing ring from igus. I need to find a pinion to drive it.
Does anyone know what m,z,D is? No reference given. Pretty sure z is number of teeth and D is diameter, but what could m be?
Quick look at my Newnes pocketbook suggests that D is pitch diameter, which is equal to mN, where N is the number of teeth and m is the module, which is used in gear train calcs.
112÷54=2.07, 184÷90=2.04, 462÷152=3.03…
Therefore I suggest that D is pitch diameter, which is an imaginary diameter on the gear rather than the widest or narrowest point, and z is number of teeth with m being module.
Ta, that was a pleasant diversion into my databook in a morning which would otherwise have tasted of spreadsheets
Ah yes, makes sense, thanks! If i find a smaller gear with the same module can I be sure they will match?
Yes
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What Rich said - be sure to choose gears of the same form (i.e. two spur gears).
Table from databook below.
Awesome, thanks! Module 2 is huge, so I think I’ll have to find sonething with finer teeth.
I’m also looking for a worm gear and pinion that would fit on a 5mm shaft, any idea where I can get that from?
You’re looking for a worm and worm wheel set - shaft sizes not set in the databook but the BSI Standard might have something, I’ll check at lunch.
In the meantime my first port of call would be lots of googling for the above term and paging through manufacturer data sheets.
You may find this useful: I’ll be around tonight and can bring a databook if that would be handy.
RS are quite good for little bits like this. Also robot building supply companies.
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