Re: [Phys-l] rust?

[Roger Haar <haar@physics.arizona.edu>]

Hi,

	Before applying heat be sure you know what metals you are working with. 
 Many lawn sprinklers have aluminum parts and even a propane torch can 
damage these.

Roger Haar

Stefan Jeglinski wrote:
> > I have a old metal garden sprinkler with several parts. I am trying to
> > unscrew the base, but it is stuck. Maybe rust or other particles have made
> > the screw threads very tight. Does anyone know of a liquid/chemical that
> > might dissolve the rust/particles and loosen the opening to free these two
> > pieces? I have tried WD-40. Also used vinegar. No luck. I might need a
> > stronger acid, but I obviously don't want to dissolve the metal too much!
>
> How about a propane torch - heat it up to expand the parts; it may 
> well free them - did this once for a router bit that was jammed down 
> in a shank.
>
>
> Stefan Jeglinski
>
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