What glue for dustcap? - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

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 4th March 2010, 05:10 PM   #1
diyAudio Member
 
event horizon's Avatar
 
Join Date: Feb 2008
Location: East Midlands, England
Default What glue for dustcap?

Hi everyone, i have a couple of pairs of 15" bass drivers that i'll eventually be incorporating into some sealed boxes. The thing is the standard dustdomes (or dustcaps if you like) have a rather large portion which is almost perfectly flat With some pressure, though with less than i'd need to move the cone the same amount it flexes quite a bit.

Well i managed to find some smart 8" dustcaps & my intension is to glue them over the top of the originals or even remove them. A little extra mass won't affect the drivers unduly, not with the cone thickness

I ust don't know what'd likely be the best glue to use as the cones are covered in some kind of coloured finish which appears quite glossy. I thought of contact adhesive but quite frankly i'm not sure how accurately i could place the cap centrally if i use it, i'd have ust the one shot

So obviously any suggestions would be appreciated - thank you!

A few pics so you can see what i'm dealing with.
Attached Images
File Type: jpg 15 inch Driver-1.jpg (67.8 KB, 172 views)
File Type: jpg Driver dust cap-1.jpg (47.8 KB, 166 views)
File Type: jpg Done but not yet-1.jpg (56.9 KB, 163 views)
__________________
"Never let your morals prevent you from doing what is right!" Salvor Hardin
  Reply With Quote
Old 4th March 2010, 05:33 PM   #2
stoc005 is offline stoc005  United States
diyAudio Member
 
stoc005's Avatar
 
Join Date: Feb 2007
Location: Midwest in the USA
Try Duco cement or Ambroid. Both can be removed with acetone if you wish. Most hobby shops carry Ambroid.
  Reply With Quote
Old 4th March 2010, 06:42 PM   #3
diyAudio Member
 
event horizon's Avatar
 
Join Date: Feb 2008
Location: East Midlands, England
Cheers for the reply stoc005

I have a feeling that the solution has just occured to me I don't actually need to use "glue", i can do the job with something that'll definately bond the two bits together - RTV. No idea why it didn't occur to me before i posted.

Well it might help someone else. I'm not sure about the adhesives you mentioned simply because they may not be available in the UK, but thanks for suggesting stuff
__________________
"Never let your morals prevent you from doing what is right!" Salvor Hardin
  Reply With Quote
Old 4th March 2010, 07:42 PM   #4
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Quote:
Originally Posted by event horizon View Post

I thought of contact adhesive but quite frankly i'm not sure how accurately i could place the cap centrally if i use it, i'd have ust the one shot
Contact adhesive
Its not that I recommend it now, but regarding your concerns, it is possible to wet glue with contact adhesive
Takes a long time to dry, but gets quite strong and tough, and slightly flexible
  Reply With Quote
Old 4th March 2010, 09:54 PM   #5
diyAudio Member
 
Join Date: May 2009
Location: Wellington
Quote:
Originally Posted by tinitus View Post
Contact adhesive
Its not that I recommend it now, but regarding your concerns, it is possible to wet glue with contact adhesive
Takes a long time to dry, but gets quite strong and tough, and slightly flexible
I use contact adhesive, applied as a bead to the edge of the dust cap. It stays wet long enough to reposition if you get it wrong (though the glue may smear and leave a mess), and it dries quickly because the dust cap is porous, allowing the solvent to escape.
  Reply With Quote
Old 5th March 2010, 09:17 AM   #6
al meta is offline al meta  United Kingdom
diyAudio Member
 
Join Date: Mar 2009
Location: london
loctite 4105 (black tack) is used by many, there are a few other black loctite products that may also be suitable, but i have only used the above, just dont spray too much accelerator on it or it will bloom and look ugly.

useful guide here:

A Recone Guide - Speakerplans.com Forums - Page 1
  Reply With Quote
Old 5th March 2010, 04:57 PM   #7
diyAudio Member
 
event horizon's Avatar
 
Join Date: Feb 2008
Location: East Midlands, England
Excellent, thanks for all the replies people

I might try the contact adhesive wet as has been suggested, at least i'll be able to apply it easily enough. What i think i might do is accurately position the dustcap & then carefully mark around the edge with a pencil, then apply the adhesive to the cone, rather than the cap itself.

I think i'm likely to get it aligned better & with less mess

Cheers for the link al meta
__________________
"Never let your morals prevent you from doing what is right!" Salvor Hardin
  Reply With Quote
Old 6th March 2010, 12:12 PM   #8
al meta is offline al meta  United Kingdom
diyAudio Member
 
Join Date: Mar 2009
Location: london
i wouldn't glue before putting the dustcap in place, unless you intend to do a secondary bead afterwards, as you need the glue to fill the corner created between the two for a strong bond, and you don't want to smear glue over the cone whilst trying to alighn them, i can't see contact adhesive working very well tbh.

and i don't really understand why you want to glue new dust caps over the old..? it will lower the fs by increasing mms, but the motor strength becomes more of a factor for cone control. just get better suited drivers!?
  Reply With Quote
Old 6th March 2010, 04:24 PM   #9
diyAudio Member
 
event horizon's Avatar
 
Join Date: Feb 2008
Location: East Midlands, England
Hi al meta, as i mentioned (or at least i think i did ) the standard dustcap is mostly flat apart from a few raised sections. The consequence of this is that the thing flexes very easily, i'm not the kind of person who'd put up with the standard dustcap literally doing it's own thing while at least having control over the cone.

As the driver will be mounted in a 50L sealed box & the pk-pk xmax is 35mm there will be a lot of air compression in the enclosure. The voicecoil is vented through to the back of the magnet assembly so my guess is that the original dome will be flexing away willy nilly.

That's the last thing i want as you can possibly imagine. I can make the centre of the dustcap move 0.5cm in the centre whilst the cone actually moves less due to the rather stiff suspension

I'll take your recommendations into consideration, cheers for your input
__________________
"Never let your morals prevent you from doing what is right!" Salvor Hardin
  Reply With Quote
Old 6th March 2010, 05:01 PM   #10
diyAudio Member
 
ashok's Avatar
 
Join Date: Jun 2002
Location: 3RS
I use a rubber based glue. Like the ones used to repair bycycle tires. These are available here in tubes also and there seems to be hundreds of brand names ! They can be removed easily after some initial soaking with a solvent , and there are many that will remove it. I use Amyl Acetate .
You just apply the glue on the dust cap. Align it into the proper position and leave it there for several hours. You can move it around for several minutes till the solvent starts evaporating. This takes time but give you enough time to adjust the position of the dust cap in case it's skewed.
__________________
AM
  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
Torn Dustcap mulletdude Subwoofers 3 5th October 2009 08:30 PM
Under the dustcap . . . Kensai Full Range 0 14th June 2006 10:49 PM
Dynaudio dustcap removal?? AJinFLA Multi-Way 3 30th April 2005 10:16 PM
recommend glue for dustcap replacement with ceramic cones Dan337 Multi-Way 2 23rd January 2004 08:46 PM
porous dustcap capslock Multi-Way 4 10th January 2003 08:43 AM


New To Site? Need Help?

All times are GMT. The time now is 03:46 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