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+--- Thread: Figuring Out The Modulus of a Gear (/thread-863.html)
Figuring Out The Modulus of a Gear - EdK - 09-24-2012
How does one figure out the modulus of a spur gear? I'm wondering what the modulus of the change gears of my lathe are.
Thanks,
Ed
RE: Figuring Out The Modulus of a Gear - DaveH - 09-24-2012
Ed,
See if this helps http://www.micro-machine-shop.com/module_gear_data.pdf
DaveH
RE: Figuring Out The Modulus of a Gear - EdK - 09-24-2012
(09-24-2012, 06:18 PM)DaveH Wrote: Ed,
See if this helps http://www.micro-machine-shop.com/module_gear_data.pdf
DaveH
Thanks Dave. I'll have to read that a few times before I have a chance of figuring out what all of that math means.
Ed
RE: Figuring Out The Modulus of a Gear - TomG - 09-24-2012
Ed,
I believe it's just the pitch diameter of the gear divided by the number of teeth.
Tom
RE: Figuring Out The Modulus of a Gear - EdK - 09-24-2012
(09-24-2012, 06:28 PM)TomG Wrote: Ed,
I believe it's just the pitch diameter of the gear divided by the number of teeth.
Tom
Thanks Tom. That I can work with. I'm sure the lathe change gears are metric but didn't know how to figure out the modulus.
Ed
RE: Figuring Out The Modulus of a Gear - Sunset Machine - 09-24-2012
And to confuse us all, DP gears are just the opposite... teeth/PD
An edit to add a possibly more useful tidbit::: (Outside Diameter) / (Number of Teeth + 2) = Module
Similarly, you'd reverse divisor/quotient for DP gears.