On Tue, Jul 06, 2010 at 11:57:37AM -0400, Lee Haefele wrote:
> I have 2 concentric steel pipes, ~6" diameter, held together with set
> screws. The 2 pipes are within each other, rusted tight. This is the
> adjustable height tube for an aerial lift on a 1 ton truck. It needs to be
> separated to mount unit to a van. Have tried PB blaster for 2 weeks, tried
> a 12 ton jack and a huge blowtorch. No movement. We are trying Coke A Cola
> next. What could shrink the rust material? With more disassembly we could
> apply more heat. (Need to remove wires and hoses.)
First off, I'd take a piece of wood and whack the heck out of the thing,
trying to make it ring; that should crack loose any solid rust. Next,
Ospho is great for removing rust stains from a deck, so it would most
likely do a good job in your case as well - although I'd make sure to
rinse it off after you're done with it. It leaves a rather sticky
coating if you don't; great for painting, not so great for cleaning.
If that doesn't do it, any good machine shop should have a large
hydraulic press - say, 100-300 tons. If you can find some grizzled old
tool-and-die maker who's been at at it for 50 years or so - those guys
make bets against each other by cracking (but not smashing) eggs in that
press - he'll pop that thing loose for you in a trice. :)
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