Demagnetizing Coil
Demagnetizing Coil
(OP)
I am a machinist and know next to nothing about electricity
and nothing about magnetism. I have a very valuable surface
grinder chuck, a 6x4x20 inch piece of laminated steel and
brass which has become magnetized. I would like to demagnetize it by passing it through a 10-12 inch diameter alternating current (120 volt) coil wrapped around a piece of steel or plastic (which would be better?) pipe. From reading some web sites on demagnetization I think this will work. I can buy insulated solid copper wire at Home Depo. My question is: what size wire and how many turns should I use?
Any information would be a great help as I know nothing about what I am doing.
and nothing about magnetism. I have a very valuable surface
grinder chuck, a 6x4x20 inch piece of laminated steel and
brass which has become magnetized. I would like to demagnetize it by passing it through a 10-12 inch diameter alternating current (120 volt) coil wrapped around a piece of steel or plastic (which would be better?) pipe. From reading some web sites on demagnetization I think this will work. I can buy insulated solid copper wire at Home Depo. My question is: what size wire and how many turns should I use?
Any information would be a great help as I know nothing about what I am doing.





RE: Demagnetizing Coil
According to your data, pipe for coil must be plastic. Winding lengh: 20 inch; copper wire diameter:.2 to .3 inch ; number of turns: 60 to 100 ; voltage: from 240 V to zero; current values are not easy to calculate, but my best estimate is from 20 A to zero. VARIAC must allow 240 V and 20 A.
Process can be very brief: power connection, voltage reduction to zero, end: 2 or 3 seconds. Grinder chuck and coil should be both firmly hold due to high electrodynamic forces.
Demagnetization is not guaranteed since it highly depends on grinder chuck size and shape.
Good luck.
Julian
RE: Demagnetizing Coil
RE: Demagnetizing Coil
turning off the current.
As the distance in increasing (during removal) the object
is repeatedly magnetized in alternating direction with
decreasing field.
<nbucska@pcperipherals.com>
RE: Demagnetizing Coil
RE: Demagnetizing Coil
best of luck,
Stan
RE: Demagnetizing Coil
is not enough to completly destroy it, even if it gets
rusty, it may still remain usable.
You may try some acid...
<nbucska@pcperipherals.com>
RE: Demagnetizing Coil
Alternately go to any place that sells parts to TV service technicians and buy a degaussing coil. It should be less than $40.00.
RE: Demagnetizing Coil
http://www.antennex.com/hws/ws0300/magdemag.htm
RE: Demagnetizing Coil
Get hold of a proper technician's TV degaussing coil.