woodruff key shear problem
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Re: woodruff key shear problem II
Re: woodruff key shear problem -- dwaldron	Post Reply	Top of thread	Forum

Posted by: siimbi ® 10/22/2004, 15:26:42 Author Profile Mail author Edit

I also have a woodruff key shearing problem.I am looking for a place in New York City where I can find a very small key of the following dimensions: Diameter= 0.2813", Width= 0.0938". I don't know the height because it sheared off. Any help would be appreciated. Thank you.

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Re: woodruff key shear problem II
Re: Re: woodruff key shear problem II -- siimbi	Post Reply	Top of thread	Forum

Posted by: dwaldron ® 10/22/2004, 19:49:48 Author Profile Mail author Edit

I would suggest Standard Steel Specialty Co., 800-356-9232. They claim to be a custom provider of woodruff keys. I have no experience with them.

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Re: woodruff key shear problem
Re: woodruff key shear problem -- dwaldron	Post Reply	Top of thread	Forum

Posted by: Marcwayne ® 10/03/2004, 07:48:31 Author Profile Mail author Edit

Shearing keys are usually the result of an excessive shock loading. After that happens the gear and shaft are worn and the shock loading increases. I have had many problems with this in the past. We even tried using double keyways which worked but became an expensive fix. I started using loctite and never had any more problems. Loctite will soak up some of the worn clearences and reduce the shock loading. Minor heating of the parts will neccesetate the removal in the future if need be.

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Re: woodruff key shear problem
Re: Re: woodruff key shear problem -- Marcwayne	Post Reply	Top of thread	Forum

Posted by: dwaldron ® 10/03/2004, 14:01:25 Author Profile Mail author Edit

Thanks for the loctite idea, I will try it out. I also found that woodruff keys are available in two grades of steel - special carbon steel (SAE 1035) and heat treated alloy steel (SAE 8630). In your experience, which of the two is the toughest? Also, by swithcing to the tougher of the two metals, will I remain in the tolerance range for the maximum torque the motor shaft is rated for? Modified by dwaldron at Sun, Oct 03, 2004, 14:07:51

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Re: woodruff key shear problem
Re: Re: woodruff key shear problem -- dwaldron	Post Reply	Top of thread	Forum

Posted by: gumbo ® 10/05/2004, 21:35:11 Author Profile Mail author Edit

It depends on the material condition as to what the actual strength of the key is going to be but the 8630 is most likely in a higher strength condition.  The 1035 may have a yield up to around 85 ksi whereas the 8630 could be in the 130 ksi range.  As far as the shaft withstanding the higher strength key that would need to be calculated and there isn't enough data given to do that.  Would need shaft size, material, keyway width, keyway length and  hub material to know for sure.

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