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Figuring Out The Modulus of a Gear

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Figuring Out The Modulus of a Gear
EdK Offline
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#1
09-24-2012, 06:01 PM
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.

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Ed
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DaveH Offline
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#2
09-24-2012, 06:18 PM
Ed,
See if this helps http://www.micro-machine-shop.com/module_gear_data.pdf
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EdK Offline
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#3
09-24-2012, 06:23 PM
(09-24-2012, 06:18 PM)DaveH Wrote: Ed,
See if this helps http://www.micro-machine-shop.com/module_gear_data.pdf
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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. 17428

Ed
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TomG Offline
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#4
09-24-2012, 06:28 PM
Ed,

I believe it's just the pitch diameter of the gear divided by the number of teeth. Chin

Tom
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EdK Offline
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#5
09-24-2012, 06:30 PM
(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. Chin

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
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Sunset Machine Offline
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#6
09-24-2012, 07:05 PM (This post was last modified: 09-24-2012, 09:33 PM by Sunset Machine.)
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.
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