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Old 14th May 2014, 06:22 PM   #1
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Default Rebuilding wire wound power resistors

Hi,
I have a large wattage uniquely sized (round) resistor that needs to be rebuilt. I know that it is 180 ohms center tapped, and it's unubtanium and made to fit in a tight area. I removed some if the covering with a wire wheel and the wire is indeed broken in several places.

Does anyone know where I can find replacement wire and what kind of coating us on this thing? I believe its 300 watts.


Thanks,
Jeff
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Old 15th May 2014, 11:33 PM   #2
Spiny is offline Spiny  United Kingdom
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that looks like a vitreous enamel resistor, Ohmite are a maker though no circular ones now apart from Rheostats.
I think this will be nichrome wire (nickel chromium resistance wire)

alan

Last edited by Spiny; 15th May 2014 at 11:38 PM.
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Old 16th May 2014, 04:04 AM   #3
DUG is online now DUG  Canada
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Buy another 180-200 ohm and unwind it...you will not be able to re-use the wire on the one you have...or at least half of it.

Then find a pottery class and ask if you can enamel and fire your repaired resistor.

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Old 16th May 2014, 04:21 AM   #4
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Thanks for the advice, the coating seems to not be hard. I took a wire wheel and it seemed to come right off. I was thinking about trying to silver solder a piece of toaster wire between the couple of turns and see how close it was.
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Old 16th May 2014, 04:40 AM   #5
Enzo is offline Enzo  United States
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Some thoughts:

It almost looks like the element part of a rheostat, like they removed the wiper assembly.

What does it do? Is there a compelling reason a replacement could not be mounted remotely with three wires run to this space?
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Old 16th May 2014, 11:58 AM   #6
DUG is online now DUG  Canada
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Quote:
Originally Posted by nightrider0614 View Post
Thanks for the advice, the coating seems to not be hard. I took a wire wheel and it seemed to come right off. I was thinking about trying to silver solder a piece of toaster wire between the couple of turns and see how close it was.
If you have the capability to do that then it is a good idea...you could still use wire from another wirewound resistor...it may match the size better.
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Old 16th May 2014, 01:11 PM   #7
AndrewT is offline AndrewT  Scotland
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I ran slot cars for a few years.
We wound our own controller resistors.

I used car exhaust sealer for as a very heat resistant adhesive. Never had a failure.
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Old 16th May 2014, 01:46 PM   #8
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It's actually for my wife's kitchenaid mixer. I am going to run to the surplus store tomorrow and see if there is a resistor that it can use to scavenge the wire from.

I had a hard time getting her to let me paint it candy apple red, now it has to look and work like new!
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