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Max. torque for a gear.

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cheesehead

Lifer
I want to make a gearbox capable of dealing with about 100 pound-feet of torque at ~100RPM with a high degree of efficiency. I'm assuming there's some measurement for themaximum force (in pounds) I can safely apply to the teeth of the cogs, but I do not know what it is. I'd like to be able to use a 2" x 1/2" wide cog for the input, but the 600 pounds of force on the teeth does seem like quite a lot, even for a helical gear in an oil bath.
 
It's been a while since I last designed anything with gears in it, but I seem to recall that most manufacturers listed maximum torques as part of the gear specifications in their catalogues.

You can also look at this site for a rough initial calculation on a spur gear and links to the relevant standards for the more detailed calculations:
Spur Gears
 
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