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EddyCurr
01-04-2012, 01:07 AM
If you happen to some day be tasked with removing dents from
difficult-to-access locations in non-ferrous metal objects, then the
techniques for using magnets demonstrated in the following videos
may prove inspiring.

I had imagined that when horn instruments were damaged, it became
necessary to disassemble these in order to reach locations with backing
tools - not so ...


Magnetic Dent Removal (http://www.youtube.com/watch?v=4vAM8_BEz7g)

Tuba Dents Removal (http://www.youtube.com/watch?v=foDh7rgWAfI)

.

Peter.
01-04-2012, 07:55 AM
That is pretty cool.

Your Old Dog
01-04-2012, 10:47 AM
That was pretty slick. Wonder if it will remove fecal matter as well. Had a kid sat behind me on the school buss.....never mind.

lynnl
01-04-2012, 11:17 AM
Yep! Some of those human beings are clever critters, that's for sure.

What's a typical thickness of the metal in a brass horn like those? Are we talking something not much thicker than aluminum foil?

hornluv
01-04-2012, 12:54 PM
On French horns, Trombones, and Trumpets it's from .015 to .020". Euphoniums and Tubas can be quite a bit thicker, .025 to .030" depending on the maker.

Frank Ford
01-04-2012, 04:31 PM
Those guys use some strenghthy magnets - 2" diameter x 2" long isn't uncommon. And, they can be dangerous buggers

Inspired by the horn dent removal technique, I worked up a system for using the big magnets to "iron" out uneven, impossible to clamp parts of wood guitar bodies.

I have to keep the magnets caged, or they will jump and damage stuff for sure:

http://www.frets.com/FRETSPages/Luthier/HighTechDept/Magnets/MagPlunger/MagPlungerViews/bigmagplunger14.jpg


More about that:

http://www.frets.com/FRETSPages/Luthier/HighTechDept/Magnets/MagPlunger/magplunger.html