metalmagpie
Titanium
- Joined
- May 22, 2006
- Location
- Seattle
I have a pattern cutter (oxyacetylene). The torch moves as a speed-controlled DC motor turns. In the end of its rotor is snapped a knurled steel lug. The DC motor is permanent magnet type. Some of the magnetism goes into the lug, enough to make it "stick" to the side of a template.
This thing was dropped on the ground in farm country in a shed that later was used to house chickens. Needless to say, it became befouled with chicken poop. The motor bearings when I got it were siezed. By working it with Kroil I was able to get it operative again. But the bearings were totally crunchy. So I took it apart and replaced the bearings. Now it's quiet but when I removed the rotor, it lost about half of its magnetism. So I want to remagnetize the motor.
Problem is I don't know how.
I'm considering winding a couple pounds of light gauge magnet wire onto a hollow spool big enough so I can put the motor (about the size of a soup can) fully inside the spool, then touch the ends of the wire to a car battery.
Is there a better way to make a one-off remagnetizing jig?
metalmagpie
This thing was dropped on the ground in farm country in a shed that later was used to house chickens. Needless to say, it became befouled with chicken poop. The motor bearings when I got it were siezed. By working it with Kroil I was able to get it operative again. But the bearings were totally crunchy. So I took it apart and replaced the bearings. Now it's quiet but when I removed the rotor, it lost about half of its magnetism. So I want to remagnetize the motor.
Problem is I don't know how.
I'm considering winding a couple pounds of light gauge magnet wire onto a hollow spool big enough so I can put the motor (about the size of a soup can) fully inside the spool, then touch the ends of the wire to a car battery.
Is there a better way to make a one-off remagnetizing jig?
metalmagpie