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Old 9th January 2006, 08:43 AM   #1
DKAudio is offline DKAudio  United States
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Default Making A Voice Coil

I want to build a driver and am going to start winding my own VC. I will use 24AWG magnet wire (it is the only size I have and I have a lot of it). I am going to use an aluminum beer can for the former and was going to wrap it is Kapton tape. I was wondering what thickness I should use. Also, what glue should I use to hold the VC in place? Could I use polyurethane? I have Minwax fast drying clear gloss polyurethane and clear gloss Minwax Helmsman spar urethane. Would these work? Thanks
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Old 9th January 2006, 11:01 AM   #2
Volenti is offline Volenti  Australia
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Can't help you with the glues, but remember to put a slit in the aluminum former or it will act as a shorted turn and dump the efficiency in the toilet
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Old 9th January 2006, 11:07 AM   #3
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You may find this interesting.

Interesting link
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Old 9th January 2006, 04:59 PM   #4
DKAudio is offline DKAudio  United States
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Hmm, put a slit in the former? Can the ends of the slit touch or can it not touch at all? Thanks for that info, I didn't know that.

That Loctite link was interesting. They make good stuff, pretty pricey too though. I know for bonding the VC to the spider and cone I was told I can use any 5 min epoxy (could probably use that for most of the glueing needs. I didn't see anything for the VC to the former though.
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Old 9th January 2006, 10:03 PM   #5
Volenti is offline Volenti  Australia
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The former is split all the way, there's a pic on this page that shows the gap in the former.

Quote:
I didn't see anything for the VC to the former though.
And this is a pretty important, the glue is the first thing that fails when a voice coil overheats. I can see 2 ways of doing this;

1. wind the coil, then use a very thin consistency epoxy that will penetrate the layers to bind everything together.

2. use a very slow setting epoxy and wind the coil "wet", messy but you would be more assured of full glue penetration.
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Old 9th January 2006, 10:15 PM   #6
karma is offline karma  Canada
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Old 9th January 2006, 11:51 PM   #7
Ron E is offline Ron E  United States
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search for a thread called DIY dynamic driver

I posted a spreadsheet to help you predict parameters.
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Old 9th January 2006, 11:57 PM   #8
DKAudio is offline DKAudio  United States
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Thanks for all the information, I appretiate it. Now that I saw that pic of the former I remember seeing the ones I have taken apart like that too. For Kapton tape would this work...

4 Inches Wide x 36 Yards Long x 1 mil Thick

--------------------------------------------------------------------------------

From C.S. Hyde Co. Product# 18-1S

I will try winding wet with slow drying epoxy. What kind shout I get, from Home Depot would be great. Any other tips with information would be excellent.
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Old 10th January 2006, 02:04 PM   #9
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I think most five minute epoxies, even when fully cured, soften considerably under heat. Maybe loctite tech help could give some
assurance on this. May or may not be an issue for you.
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Old 10th January 2006, 04:39 PM   #10
DKAudio is offline DKAudio  United States
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I'll look into that. What about the Kapton tape? Is there something else that would be cheaper or do I need Kapton? Thanks
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