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Westinghouse Style 321347 Rebuild: Switch Armature  Rate Topic 
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 Posted: Sat Sep 11th, 2021 03:20 pm
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Brandon Shearer
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After a phonograph "expert" and a small electric motor company tried to fix this fan unsuccessfully, I think I will try to now because I really wanted an antique fan for my 1920s speakeasy I built. Plus I'm in Florida and its hot so fans are essential. I've worked on antique cars, motorcycles, monitor to fridges, and 1930s radios and jukeboxes so maybe I have a shot.  Joined the forum today and see many great posts about rewiring, which is essential.

I see the first thing I need is a replacement for this switch armature which is beyond fried.

Question: does anyone rebuild these or is it even rebuildable? if not does anyone have a parts fan that would sell a donor? Thanks in advance.-Brandon

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 Posted: Sat Sep 11th, 2021 04:32 pm
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Brandon Shearer
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here is the tag...

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 Posted: Sat Sep 11th, 2021 07:16 pm
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Mark Olson
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That is a choke, commonly known as a speed coil. They are not difficult to rewind. The lamination stack is similar to a deck of cards having been shuffled. Remove them and remove the coil. Count the turns of wire on the coil noting where the taps are. Obtain the proper gauge magnet wire and a form to wind it on. The form should fit inside the coil so that when it is removed, the stack can be re-assembled in the coil.


Clear as mud, right?



Sorry, but it is harder to explain than it is to do it.

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 Posted: Sun Sep 12th, 2021 10:35 am
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David Hoatson
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Also, when you have the lamination plates apart, bead blast or sand them to get the rust off, then spray one side of each plate with Sprayon Clear Insulating Varnish. For the coil to work properly, the plates need to be insulated from each other over most of their area. 
When the new coil is wound, wrap it with friction tape (cloth electrical tape). 

Just before assembling the coil and plates, spray the other side of the plates, then assemble while the varnish is almost dry, but a little tacky. This sticks it together so it won’t hum. 

If the coil is loose on the laminations, lightly jam wood wedges or friction tape between the plate stack and coil. 

Once assembled, spray with the varnish. 

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 Posted: Sun Sep 12th, 2021 12:52 pm
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Brandon Shearer
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David & Mark, thanks for the reply and that seems easy enough to do. Wire, varnish, and friction tape so we will start there. I guess the hard part now is figuring out what the AWG of the magnet wire is?? It is small so somewhere between 20-32? Is there a standard for speed coils?

Last edited on Sun Sep 12th, 2021 01:28 pm by Brandon Shearer

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 Posted: Sun Sep 12th, 2021 01:24 pm
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David Hoatson
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The trick is in making the form. The coil must be the right size. Once the coil is made, you may need to break the form apart to get the coil off. 
Dayton

https://www.facebook.com/231099220647012/posts/963633317393595/?d=n

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Nn

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 Posted: Sun Sep 12th, 2021 04:02 pm
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Mark Olson
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Measure the wire with a micrometer, digital calipers, dial calipers, even vernier calipers will do. Harbor Freight sells an inexpensive pair that work just fine. Translate that diameter to awg size with a chart, readily available online. The John McComas wiring diagram link from the home page F.A.Q's has a chart, as well.

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 Posted: Mon Sep 13th, 2021 11:40 am
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Brandon Shearer
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Thanks for another great tip.

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