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 Post subject: Duco cement+cd case plastic for coil form -anyone done this?
PostPosted: Apr Wed 10, 2019 2:21 am 
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I have a large B&W coil whose (cellulose?) supports have crumbled; and I have seen a few mentions online (and some old ones from ARF) about using strips of CD case plastic with Duco cement to build air coil supports.

Has anyone done this, and if so, tips appreciated!

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 Post subject: Re: Duco cement+cd case plastic for coil form -anyone done t
PostPosted: Apr Wed 10, 2019 6:54 am 
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The least expensive readily available coil form material I know of, is PVC pipe. I used a short length for a regen receiver I built.

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 Post subject: Re: Duco cement+cd case plastic for coil form -anyone done t
PostPosted: Apr Wed 10, 2019 12:11 pm 
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Yes, I have repaired AIR coils using that method. The tricky part is cutting the CD case into strips. The material is very brittle. Remove one of the original strips at a time. I use a small binder clip to hold the new strip in place. Make sure that you don't disrupt the coil wire spacing. Flow the Duco and wait till it is complexly dry before moving on to the next strip.


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 Post subject: Re: Duco cement+cd case plastic for coil form -anyone done t
PostPosted: Apr Thu 11, 2019 12:51 am 
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If the old strips are still holding the wire in place, just put the new ones near the old ones. Then remove the old ones after the glue has set.

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 Post subject: Re: Duco cement+cd case plastic for coil form -anyone done t
PostPosted: Apr Thu 11, 2019 1:45 am 
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Thanks gents.
This is a combo coil and band switch unit made by BW so pvc is out.
the strips were quite big and all have completely shattered. I have to order the Duco cement amd will begin making some kind of jig to position the coil for applying the forms.
cheers

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 Post subject: Re: Duco cement+cd case plastic for coil form -anyone done t
PostPosted: Apr Mon 15, 2019 4:06 am 
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I would use Q-dope or plastic model cement (from a tube) rather than Duco cellulose cement. CD cases are styrene, so Q-dope or plastic model cement should solvent-weld to the CD case plastic strip.

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 Post subject: Re: Duco cement+cd case plastic for coil form -anyone done t
PostPosted: Nov Sat 09, 2019 6:53 am 
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You could try the plastic clear orange medicine bottles for your form(s) or even wooden dowels.

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 Post subject: Re: Duco cement+cd case plastic for coil form -anyone done t
PostPosted: Nov Sat 23, 2019 1:16 am 
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I recently made some coil forms for an inductor.
I used a manila file folder to cut pieces and make the form.
I coated it with the epoxy used for laying fiberglas as for boats.
I think it worked out beautifully and made the paper very stiff.
If you are worried about paper and the temperature, check with
a local motor rewind shop, they have paper made for that (not really paper)

Attachment:
Coil Form.jpg
Coil Form.jpg [ 234.69 KiB | Viewed 221 times ]


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 Post subject: Re: Duco cement+cd case plastic for coil form -anyone done t
PostPosted: Nov Sat 23, 2019 7:46 am 
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It's called fish paper.

https://www.americanmicroinc.com/fish-paper

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