Dressing/Filing Stern Magnet Dimples?

(Topic ID: 219148)

Dressing/Filing Stern Magnet Dimples?


By Jason_Jehosaphat

4 months ago



Topic Stats

  • 8 posts
  • 5 Pinsiders participating
  • Latest reply 4 months ago by darkpinball
  • No one calls this topic a favorite

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#1 4 months ago

https://www.pinballlife.com/index.php?p=product&id=1837

Above is a link to a "magnet core plug."

This is apparently the portion of a magnet assembly that gets dimpled.

Can this plug be dressed? As in, can the dimpled top be filed down slightly until it's flat/smooth again? It looks to be solid steel.

Thanks.

Magnet.core (resized).jpg
#2 4 months ago
Quoted from Jason_Jehosaphat:

https://www.pinballlife.com/index.php?p=product&id=1837
Above is a link to a "magnet core plug."
This is apparently the portion of a magnet assembly that gets dimpled.
Can this plug be dressed? As in, can the dimpled top be filed down slightly until it's flat/smooth again? It looks to be solid steel.
Thanks.

Yes.

#3 4 months ago
Quoted from Jason_Jehosaphat:

https://www.pinballlife.com/index.php?p=product&id=1837
Above is a link to a "magnet core plug."
This is apparently the portion of a magnet assembly that gets dimpled.
Can this plug be dressed? As in, can the dimpled top be filed down slightly until it's flat/smooth again? It looks to be solid steel.
Thanks.

Yes, done it many times. Note that if dimpled over to much it can be a Bear to remove from the disk if its a new style magnet as Stern uses today. I simply hold it in a vise and slowly work it flush again with a single cut file. Not really tough. Good Luck.

#4 4 months ago
Quoted from Yelobird:

Yes, done it many times. Note that if dimpled over to much it can be a Bear to remove from the disk if its a new style magnet as Stern uses today. I simply hold it in a vise and slowly work it flush again with a single cut file. Not really tough. Good Luck.

Hmm.

Do I understand this correctly:

A badly mushroomed magnet core can't be "backed out" through the assembly, necessitating the removal of the whole assembly and then the dressing of the core whilst still *in* the assembly on the bench?

My hope is to remove the 3/4" nut that holds the core in the assembly, then back out the core plug and place it in a vice for dressing. Is that a fair expectation?

Thank you, V and YB, for your help on this topic.

J

#5 4 months ago
Quoted from Jason_Jehosaphat:

Hmm.
Do I understand this correctly:
A badly mushroomed magnet core can't be "backed out" through the assembly, necessitating the removal of the whole assembly and then the dressing of the core whilst still *in* the assembly on the bench?
My hope is to remove the 3/4" nut that holds the core in the assembly, then back out the core plug and place it in a vice for dressing. Is that a fair expectation?
Thank you, V and YB, for your help on this topic.
J

The core comes out through the top of the playfield. You don't want to pull a mushroomed core out through the playfield bottom, even if it's only slightly mushroomed as it will cause further damage. You just remove the retaining bolt, then unscrew the core, which raises it out the top side of the PF.

#6 4 months ago

Through the top.

Got it.

Thanks.

I'll give all this a try and check back.

#7 4 months ago

A little extra touch I do on magnets especially ones in hard to remove places is file a slight bevel around the outer top so if it mushrooms again it won't damage the surrounding area and is easy to remove from the bottom next time.

#8 4 months ago

I'm fortunate to own a lathe which makes life easier
On Metallica it was quite easy to remove the core plug but on Spider-Man I had to make a simple tool out of an old socket wrench to get more power, it looked like it was glued with loctite when it finally came loose.
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