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U/J,s when do they let go??

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Old 22 November 2004, 08:13 PM
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mart360
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Default U/J,s when do they let go??

I am thinking of using universal joints for a project of mine, but have been advised that they are inherantly unstable above certain rpms

anyone heard this and if so what rpm becomes dangerous..

i want to spin them up to about 8500


Mart
Old 22 November 2004, 08:20 PM
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Comper100
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Depends what UJ's they are, and what angle you work them through. There are equations you can use to work out what RPM rotating shafts will fail. The manufacturers of the UJ's will tell you the safe RPM limit.

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Old 22 November 2004, 08:51 PM
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mart360
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Originally Posted by Comper100
Depends what UJ's they are, and what angle you work them through. There are equations you can use to work out what RPM rotating shafts will fail. The manufacturers of the UJ's will tell you the safe RPM limit.

Comper100
no more than 5 degrees from horizontal

do you know of any manufacturers??

Mart
Old 22 November 2004, 09:47 PM
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Comper100
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Hardy Spicer comes to mind.

www.hardyspicer.com

Comper100
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