snowshooze
Hot Rolled
- Joined
- Sep 15, 2010
- Location
- Anchorage, Alaska, USA
Hi guys;
You may be familiar with the carnival ride called the spider.
Flying chairs on 20' booms. And they cam up and down.
Like a crane boom. Just up and down. Pin through hole, slip fits for being constantly torn apart and moved then assembled again..
Alright. The bushings are 3" x 3 1/2" x 3 1/16" Long and made of bronze. A dozen per rig.
Owner is not happy with factory supplied replacement bushings, too sloppy and at 20' he says he has too much lash.
Plus, they wear out and the thing is a grease guzzler. It sounds like he greases all the time but still wears them out.
I suggested a spring loaded grease cup on that particular point.
But I was thinking, possibly, Nylatron bushings?
Maybe Delrin... ( Seems way too soft for the tonnage loading ) Peek plastic???
I need to be able to handle a couple three hundred pounds per square inch or better.. accounting for the surface area of the bottom half of the bushing... maybe practically I should triple that... -- engineering for the real world --
Does anyone know of a Phenolic or plastic bushing that can handle this type of exposure?
When I was working for Wagner Mining equipment, they had like graphite infused phenolic tubing, like 18" ID and I'd make bushing out of that a foot long or so... that would be the bushing for articulating front-loaders... no idea where in come from.
Like a linen blanket in graphite loaded epoxy.. it would look kinda like bakelite, except black from the graphite. Don't have a trade name.
Anyway... alternative to bronze in this application.
Is there any? ( I was wondering too if oil-lite... )
Thanks,
Mark
You may be familiar with the carnival ride called the spider.
Flying chairs on 20' booms. And they cam up and down.
Like a crane boom. Just up and down. Pin through hole, slip fits for being constantly torn apart and moved then assembled again..
Alright. The bushings are 3" x 3 1/2" x 3 1/16" Long and made of bronze. A dozen per rig.
Owner is not happy with factory supplied replacement bushings, too sloppy and at 20' he says he has too much lash.
Plus, they wear out and the thing is a grease guzzler. It sounds like he greases all the time but still wears them out.
I suggested a spring loaded grease cup on that particular point.
But I was thinking, possibly, Nylatron bushings?
Maybe Delrin... ( Seems way too soft for the tonnage loading ) Peek plastic???
I need to be able to handle a couple three hundred pounds per square inch or better.. accounting for the surface area of the bottom half of the bushing... maybe practically I should triple that... -- engineering for the real world --
Does anyone know of a Phenolic or plastic bushing that can handle this type of exposure?
When I was working for Wagner Mining equipment, they had like graphite infused phenolic tubing, like 18" ID and I'd make bushing out of that a foot long or so... that would be the bushing for articulating front-loaders... no idea where in come from.
Like a linen blanket in graphite loaded epoxy.. it would look kinda like bakelite, except black from the graphite. Don't have a trade name.
Anyway... alternative to bronze in this application.
Is there any? ( I was wondering too if oil-lite... )
Thanks,
Mark