(Topic ID: 229228)

Demagnetizing Armatures?


By pindude80

1 year ago



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  • 39 posts
  • 15 Pinsiders participating
  • Latest reply 1 year ago by zacaj
  • Topic is favorited by 1 Pinsider

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#1 1 year ago

I was working on my 1976 Williams Blue Chip for the past 2 weeks. I had a couple problems that had myself and people trying to help me from the forum chasing our tails. I figured it out last night- the armature plates are magnetized and not releasing which was causing different intermittent problems. I put a piece of electrical tape on the armature plate and it fixed one of the problems, but the other one- ball count unit problem, sometimes works properly, sometimes on reset it cause that relay and others to "chatter" and not engage properly and then other times the armature sticks giving me my original problem.

Is there a way to demagnitize these, buy new ones, or use something other than electrical tape that I'm currently using?

#3 1 year ago

I'm not 100% sure they are magnetized, I just know they are sticking. Is there a way to tell if they are magnetized or not?

#5 1 year ago

I can test it tonight with some metallic like you mentioned.

#7 1 year ago

It would probably melt the plastic piece the switch blades go in unless I drilled out the rivet and re-riveted it.

#10 1 year ago
Quoted from pinhead52:

soldering gun is a poormans degausing ring

Cool! What is the soldering gun method?

#12 1 year ago
Quoted from rufessor:

Actually its a lot easier.
Remove them and hit them with a hammer a few times. Done
The blow from the hammer actually reorients the dipoles to randmoize them and the magnetism goes away.

That makes sense. What is the best way to get them off, pull the switch stack?

#21 1 year ago
Quoted from pinhead52:

soldering gun puts out a changing mag field, just bring it close to the object, passing up and down the object

Ok, I was wondering how to do it and how it worked.

#25 1 year ago
Quoted from jrpinball:

Hot or cold works. In the freezer for a few days will do it. I don't think I've ever come across one that was magnetized though. They usually stick when the coil is not magnetically insulated from it's frame.

I can check this, how are they supposed to be magnetically insulated from the frame?

#28 1 year ago
Quoted from jrpinball:

As "homepin" states above, there's brass in the coil stops, and the coil stop itself has a nylon bushing and a nylon insert nut to keep it insulated. That's on coils with plungers such as steppers, pop bumpers, flippers, etc.

What did I need to look for on a relay setup since there is no coil stop?

#34 1 year ago
Quoted from jrpinball:

Check some of the other relays that aren't sticking to see if they have a brass screw and a brass washer. The washer does not go under the screw head, but it goes between the end of the coil where the screw goes in, and the steel relay frame.

Ok, will do.

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