broken shaft
broken shaft
(OP)
I have a 15mmø shaft that sheared off at a roll-pin hole. The shaft is connected to the input drive with a shear-bolt that did not bread or even bend. In looking at the fractured edge there is a definite difference in the appearance of the two sides of the hole. It also looks like the metal yielded and twisted at the fracture based on the taper in the hole on both ends. Any thoughts on why this shaft would fail and not the shear bolt?





RE: broken shaft
RE: broken shaft
The shaft was too week from the hole.
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P.E. Metallurgy, Plymouth Tube
RE: broken shaft
RE: broken shaft
This is the input shaft for a Lippert RV slide gear and the hole is for a roll pin that keeps the shaft centered. This is for my motorhome and is the second gear box that has failed in two years.
RE: broken shaft
RE: broken shaft
RE: broken shaft
You can tell that the pin was 'wallowing' because the sides of the hole are flared.
That indicates to me that there was some slop in the system to begin with.
If the pin was only for location then what is the load on it?
The shaft may be under sized or under strength for the job.
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P.E. Metallurgy, Plymouth Tube
RE: broken shaft
Their stuff appears properly engineered, to a weight and especially to a price.
Their customers, RV manufacturers, all of them, appear to not be at all reluctant to misapply Lippert's, or anyone's, products, e.g., by using a part that's really one size too small for any particular application.
When you talk to Lippert and the RV manufacturer, I suspect you will find them pointing fingers at each other, which seems to be SOP for both parties, neither of whom will accept responsibility for anything.
I hope that I'm wrong in your case, and someone will step up and do something for you.
Mike Halloran
Pembroke Pines, FL, USA
RE: broken shaft
RE: broken shaft