Crane Boom Hinge Pins/Bushings - Max Allowable Wear
Crane Boom Hinge Pins/Bushings - Max Allowable Wear
(OP)
I am trying to specify when to renew a pin or bushing (installed in crane booms), based on wear/loss of material (slopy fit), either in the pin or bushing, relate those dimensions to the remaining factor of safety still in the pin. I didn't design the crane, so I am reverse engineering all of this. I have found simple shear formulas, but I'm looking for something more detailed, like what the guy used to design the crane (like a spec for designing a pined connection). Have found system design std specs, and "theoretical" type formulas for shear/etc., but nothing "practical" for simple component design. Any advice whould be greatly appreciated.





RE: Crane Boom Hinge Pins/Bushings - Max Allowable Wear
RE: Crane Boom Hinge Pins/Bushings - Max Allowable Wear
I am trying to make claims like "until you loose 5% of the pin you still have a factor of safety of 5:1, so taking the boom off is not warrented unless you have a problem". I plan to gather all material and as-built dimensional data for each pined joint. I am just looking for some canned analysis, or a "go-by"'s, for sizing a pinned joint to help build my case. I know about the "theoretical" simple solutions, the ones you see in academic texts, but I was looking for one that takes fits, gaps between clevis/eyes, etc. into consideration. Any more advice, or pointing me to a good "design handbook" of sorts would be a great help.
thanks again
RE: Crane Boom Hinge Pins/Bushings - Max Allowable Wear
RE: Crane Boom Hinge Pins/Bushings - Max Allowable Wear
I personnelly think the most direct & effective way is to carry out a load test to 2x the SWL at frequency of twice/year.
RE: Crane Boom Hinge Pins/Bushings - Max Allowable Wear
Check the owners manual or the manufactures field overhaul tolerance.
RE: Crane Boom Hinge Pins/Bushings - Max Allowable Wear
Thanks again
RE: Crane Boom Hinge Pins/Bushings - Max Allowable Wear