Making A Voice Coil

DKAudio · 9th January 2006, 08:43 AM

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

Volenti · 9th January 2006, 11:01 AM

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

pinkmouse · 9th January 2006, 11:07 AM

You may find this interesting.

Interesting link

DKAudio · 9th January 2006, 04:59 PM

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.

Volenti · 9th January 2006, 10:03 PM

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.

karma · 9th January 2006, 10:15 PM

Ron E · 9th January 2006, 11:51 PM

search for a thread called DIY dynamic driver

I posted a spreadsheet to help you predict parameters.

DKAudio · 9th January 2006, 11:57 PM

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.

peace brainerd · 10th January 2006, 02:04 PM

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.

DKAudio · 10th January 2006, 04:39 PM

I'll look into that. What about the Kapton tape? Is there something else that would be cheaper or do I need Kapton? Thanks

9th January 2006, 08:43 AM	#1
DKAudio diyAudio Member Join Date: Jan 2006 Location: Bloomington, MN	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

9th January 2006, 11:07 AM	#3
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	You may find this interesting. Interesting link __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

9th January 2006, 11:51 PM	#7
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	search for a thread called DIY dynamic driver I posted a spreadsheet to help you predict parameters. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

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9th January 2006, 11:01 AM	#2
Volenti diyAudio Member Join Date: Aug 2003 Location: Australia	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

9th January 2006, 04:59 PM	#4
DKAudio diyAudio Member Join Date: Jan 2006 Location: Bloomington, MN	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.

9th January 2006, 11:57 PM	#8
DKAudio diyAudio Member Join Date: Jan 2006 Location: Bloomington, MN	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.

10th January 2006, 02:04 PM	#9
peace brainerd diyAudio Member Join Date: Nov 2004	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.

10th January 2006, 04:39 PM	#10
DKAudio diyAudio Member Join Date: Jan 2006 Location: Bloomington, MN	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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