Problem below the surface


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Posted by hemimech on Thursday, April 16, 2009 at 21:55:12 :

In Reply to: The lack of quality is going to kill some one posted by copey on Thursday, April 16, 2009 at 14:26:09 :

Cotter pins are not designed to take the load of a joint. A properly sized & installed pin is there as a secondary measure to prevent fastener rotation which causes fretting. The same is true of crankshaft and camshaft keys. If the joint is left loose it will eventually shear the key….& these are hardened! The malleable nature of cotter pins regardless of supplier or quality will fail if the joint has inadequate clamp load. Something else led to this failure, possibly the reused bolt went into yield upon the torque or similar with the threads in the castellated nut.

For similar information take a look at the king pin joint failure (lamenesswarningonthelettersa n a l in sorry)an alysis at http://memagazine.asme.org/articles/2008/september/route_forces_take.cfm

Glad you rode it out alive Copey, that must of almost gave you whiplash.~Brian



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