Going to try winding a voice coil - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 30th August 2006, 05:57 PM   #1
diyAudio Member
 
Join Date: Sep 2005
Default Going to try winding a voice coil

Got given some Wharfedales with the drivers o/c, have dismantled one and fancy having a go at rewinding the voice coils. The bit of coil I've pulled off has 17 turns in 3.5mm of width, so about .020mm including varnish. What gauge is that?
  Reply With Quote
Old 30th August 2006, 09:48 PM   #2
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Good luck. I'll be very interested in your progress...

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 30th August 2006, 10:25 PM   #3
diyAudio Member
 
vinylkid58's Avatar
 
Join Date: May 2005
Location: Victoria, B.C.
Default Re: Going to try winding a voice coil

Quote:
Originally posted by johnthedoctor
Got given some Wharfedales with the drivers o/c, have dismantled one and fancy having a go at rewinding the voice coils. The bit of coil I've pulled off has 17 turns in 3.5mm of width, so about .020mm including varnish. What gauge is that?
3.5MM/17=0.2059 ~0.008" = 32AWG assuming the varnish is very thin and doesn't add much to dia. It could be 33AWG =0.0071" dia.

Jeff
  Reply With Quote
Old 30th August 2006, 11:05 PM   #4
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Good luck!

The voice coil needs to be pretty tight on the VC former, so you may well need to make a circular jig that just slips inside, that will stop it distorting as you wind.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 31st August 2006, 02:36 AM   #5
rjb is offline rjb  New Zealand
diyAudio Member
 
Join Date: Jun 2004
Location: Piha
The voice coil must be both tight on the former. and the combination perfectly circular when finished. You will definitely need a very smooth rod that just slides into the existing former, (or some similar removeable jig).
You will not be able to make it circular after winding if you get it wrong.
Use only enough tension on the wire to keep it firm on the former.
(You may need to grease the rod, because the winding pressure will tend to shrink the former, but be very careful to keep grease off the winding side of the former itself, (use only a very light smear), or else the glue used to fix the winding into place won't take).
Good luck
  Reply With Quote
Old 31st August 2006, 02:52 AM   #6
PB2 is offline PB2  United States
diyAudio Member
 
PB2's Avatar
 
Join Date: Sep 2004
Location: North East
Blog Entries: 1
I did it years ago with excellent results. The first was a Dyna A-25
woofer, this was for Phillips AD8060 woofers:

http://members.aol.com/basconsultants/hand_vc.htm

Click the image to open in full size.

One mistake was that the former was slightly thicker than the original,
and it was a tight fit. Most hobby shops in the US carry very thin stock
sheet of aluminum and often brass. I used copper to match the thermal
properties of the wire. Be sure to use the correct gauge wire.

The wire now comes in different grades with different temperature ratings
as I recall.

I used high temp two part epoxy.

Pete B.
  Reply With Quote
Old 31st August 2006, 08:16 AM   #7
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
that's a very short VC @ 3.5mm.

Is it overhung (bass/mid) or underhung (treble and some mid)?

Looking forward to your solutions, conlusions and pics.
__________________
regards Andrew T.
  Reply With Quote
Old 31st August 2006, 02:48 PM   #8
diyAudio Member
 
Join Date: Sep 2005
Thanks all for the help.

The 3.5mm is only part of the coil that I pulled off the former. Total coil is about 28 turns, single layer. Have a bad feeling that the cone has to be removed but will try doing it with the cone intact. 4 bolts holding the magnet to the basket so hoping there's enough play there for adjustments.

Wasn't expecting such interest in my progress, I'm a noob at diy audio and the drivers are dead anyway but I'll take pics as I go along for a 'How Not To' guide.
  Reply With Quote
Old 31st August 2006, 03:02 PM   #9
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
Years ago I used to do this with the cone still attached to the coil-former. I removed the dustcap since it made things easier (especiallly the centering afterwards). If I couldn't find an adequate rod I used shets of thin paper or film negative inbetween. You definitely need to glue the wire to the former in the end.

Regards

Charles
  Reply With Quote
Old 31st August 2006, 04:49 PM   #10
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
DO NOT unbolt the magnet from the pole pieces.

Due to the very strong magnetic attraction it will be extremely difficult to re-centre the pole gaps which must be concentric.

If the magnet surface is not plane (mine is not) and the pole piece is plane then there is a gap which I imagine reduces the total flux across the gap.

Q.
Is it better to fill the pole piece to magnet gap with a magnetic fluid before bolting it all back up?

I have still to design a jig to keep accurate alignment while offering up the pole to the magnet.
__________________
regards Andrew T.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Voice Coil Burning adelphia83 Car Audio 7 13th November 2008 12:10 PM
Single Voice Coil Vs Double Voice Coil Subwoofer Workhorse Car Audio 6 12th April 2007 06:36 AM
ASV voice coil ? Nihilist Multi-Way 4 1st October 2006 07:16 PM
an amp for each voice coil? speekergeek Multi-Way 1 12th December 2003 02:31 AM
Source for coil winding wire Phil O.son Multi-Way 6 22nd October 2002 02:58 PM


New To Site? Need Help?

All times are GMT. The time now is 02:31 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2