Armeture Demagnetize

[John Szegda]

Hello:

During wire brushing rust on armeture magnets for a 2KW I'm overhauling, my wire wheel
disinagrated. The wires are know clinging on the magnets. I managed to remove alot of the string wires by using a brass brush, but there are some that are hard to remove. I was thinking of demagnetizing the brushes, but I d'ont know how to do it. Would appreciate any help.

John

[Rob Beckers]

John, "sticky problem" you got there... :cool:

How well do they stick? Would getting in there with some type of sticky tape (duct tape is pretty sticky) pick them up?

I can't see how you can demagnetize those wires; For steel that has been magnetized you'd have to heat it above the Curie temperature (about 1000F) to shake the permanent magnetism, but in the presence of strong magnets like you have it'll still stick to those magnets via induced magnetism. Not to mention that you would kill your magnets if you were to heat anything up that high.

-RoB-

[Brian McGowan]

When I ran sound for a band there were horns that had metal diaphragms. When you overdrove them they would bottom out and shatter. Pieces would end up in the magnet gap. When replaced the first step was to fold masking tape sticky side out on a piece of cardboard match book and run it around in the magnet gap to eliminate the pieces.

Rob is right. Tape and patience is the only thing I know that will remove those pieces.

[Andy Rhody]

When I ran sound for a band there were horns that had metal diaphragms. When you overdrove them they would bottom out and shatter. Pieces would end up in the magnet gap. When replaced the first step was to fold masking tape sticky side out on a piece of cardboard match book and run it around in the magnet gap to eliminate the pieces.

Rob is right. Tape and patience is the only thing I know that will remove those pieces.

Brian, sounds like you were maybe using Altec Lansing Voice of the Theater Horns. I did that many times. I still have those horns. I had a band that played Eastern Pa. in the mid 70's. (Pottstown and the Poconos). Small world sometimes.

[Brian McGowan]

Can't remember what I actually had. They belonged to the band. There was a set of 2" horns mounted in the tops of perkins bins with light 15" midrange speakers and a set of 1" horns in separate boxes.
I played from Quakertown to Wildwood from 81 to 87 5 nights a week while working for a computer peripheral manufacturer 5 days a week.