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12-02-2014, 06:28 PM | #1 |
Senior Member
Join Date: Apr 2013
Location: Oregon
Posts: 465
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Original Amp-meter Restoration
A while ago there were a few threads about obtaining reliable amp-meters. I've had a couple of repops that were less than satisfactory, so I purchased an original from Bert's and am cleaning it up.
Inside there's a sort of gasket that's round in diameter and holds in the plate to which the needle attaches (this is not my photo, but one I lifted from another thread): To complete my restoration, I need to remove the original gasket and replace it with something. But what? What was the original made of and what can be used to replace it? Many thanks! |
12-02-2014, 07:51 PM | #2 |
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Join Date: May 2010
Location: Englewood, Colorado
Posts: 1,372
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Re: Original Amp-meter Restoration
It is just thick paper. Get a sheet of thin cardboard (like a file folder) and a razor blade and cut one out.
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12-03-2014, 12:10 PM | #3 |
Senior Member
Join Date: Apr 2013
Location: Oregon
Posts: 465
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Re: Original Amp-meter Restoration
Thanks Steve. Yup, got the paper gasket figured out. Once I remove the bezel, glass and face plate, I'm left with what's shown above in my post #1.
Now, I'd like to remove the interior plate to which is attached the needle and round-headed bolts. There is some rust and peeling paint that needs to be cleaned up, and the interior needs to be repainted. I've made the special tool described by Tom W to remove the screws from the backing plate (thanks, Tom) and have successfully accomplished that. My problem is that there is a metallic retainer that holds the interior plate in place, and it won't budge. The retainer is clearly shown in the photo above in post #1. You can see it as the circular metal rod just inside the housing... the one that is not quite an entire circle. Is this retainer ring removable? I can't get it to move easily and don't want to force it. If it is removable, but just stuck because of rust, can I safely apply penetrating oil to loosen it? If it's not removable, what's the best way to proceed with cleaning and re-painting? Many thanks! |
12-03-2014, 03:11 PM | #4 |
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Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
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Re: Original Amp-meter Restoration
That is not a retainer, but is a magnet. If you remove it be sure it goes back exactly the same as it came out. If you turn it over the meter will read backwards.
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12-03-2014, 08:04 PM | #5 |
Senior Member
Join Date: Apr 2013
Location: Oregon
Posts: 465
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Re: Original Amp-meter Restoration
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Thanks Tom. Well, now that the cat's outta the bag that my PhD's NOT in electricity I boned up on ammeters and after learning more about how they work I can report our children IS learning Thanks... my world's a little bigger! I applied a little penetrating oil and carefully separated the slightly-rusted magnet from the case and was able to remove the innards. I'm ready to clean things up, re-paint, test it and install it in my car. Another oldie saved and lots learned along the way. Thanks for the lesson. |
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