degaussing for compass

opposite polarity, switch direction manually. Use less
current (amps) with each cycle. There are machines that do
this automatically, but you can rig up something to do it
from odd bits and pieces.



"nrp" wrote in message
ups.com...
|
|
| (2) DC method. Place the part in the
|
| same relative position as when magnetized and
|
| apply reversing DC current.
|
| What's a reversing DC current?
|

opposite polarity, switch direction manually. Use less
current (amps) with each cycle. There are machines that do
this automatically, but you can rig up something to do it
from odd bits and pieces.
There are machines that do
this automatically,

Isn't this the 60 Hz line? Just withdrawing the coil will fade the
cyclic magnetic flux.

BTW I had in mind a several ft diameter for the #14 wire concept, so
that a steel tube fuselage could be degaussed.

There are direct current machines for doing magnetic
particle inspection [MagnaFlux] and these machine do have a
built in degaussing procedure with DC current.

Yes, a large coil with AC can be used to degauss by
withdrawing the coil to several feet. Putting a tool or
tube in the AC field and switching OFF will magnetize
because the induced field is cut suddenly.



"nrp" wrote in message
oups.com...
|
| opposite polarity, switch direction manually. Use less
| current (amps) with each cycle. There are machines that
do
| this automatically, but you can rig up something to do
it
| from odd bits and pieces.
| There are machines that do
| this automatically,
|
| Isn't this the 60 Hz line? Just withdrawing the coil will
fade the
| cyclic magnetic flux.
|
| BTW I had in mind a several ft diameter for the #14 wire
concept, so
| that a steel tube fuselage could be degaussed.
|

That works ... sort of. How much magnetism (if any) you get, and of which
polarity is a function of where in the waveform the coil is when you switch
the current off.

Jim



Yes, a large coil with AC can be used to degauss by
withdrawing the coil to several feet. Putting a tool or
tube in the AC field and switching OFF will magnetize
because the induced field is cut suddenly.