recone glue

Ben Lawrence

Ben Lawrence

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Mar 2, 2011
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Hello,
I just purchased some dis assembled eminence recone kits. I have the glue products for the pre assembled kits but am wondering what I need to order for attaching the voice coil to the spider/cone. Also any tips would be appreciated. I have replaced the pre assembled style a bunch of times but this will be my first go at the bare parts style.
 
Re: recone glue

Ben Lawrence said:
Hello,
I just purchased some dis assembled eminence recone kits. I have the glue products for the pre assembled kits but am wondering what I need to order for attaching the voice coil to the spider/cone. Also any tips would be appreciated. I have replaced the pre assembled style a bunch of times but this will be my first go at the bare parts style.
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Those are the hardest type to recone-you have to get everything lined up properly-or it will rub.

I would suggest epoxy for the voice coil/spider/cone connections.

For lighter weight drivers the 5 minute stuff is fine. But for higher power-use the longer cure stuff-as long as you can find.

Yes there are all kinds of "instacure type products and some are better than others-but I was always a slow cure epoxy type guy-back when I was doing reconing.
 
Re: recone glue

I see some loctite 2 part epoxy being sold on some recone sites. Hopefully I can get something similar at a hardware store close by. I have one of the blown assemblies still to get the voice coil depth so that should help. I also have some shims and stuff stashed awy somewhere so That should come in handy as well.
 
Re: recone glue

Ivan Beaver said:
For lighter weight drivers the 5 minute stuff is fine. But for higher power-use the longer cure stuff-as long as you can find.
Click to expand...

Hey Ivan,

I'm just curious, I've never re-coned but I have worked with a lot of epoxies. Usually the shorter curing epoxies are stronger, the longer cure times are mostly to allow you additional positioning time. Have you found this to not be the case?
 
Re: recone glue

In olden times we used Resiweld. It's a high temperature epoxy that EV used for producing and servicing their speakers. I think you can get it from boating/marine suppliers nowadays, but it's expensive. JB Weld would probably work but I've never used it for that application. CP Moyen is a big producer of speaker epoxies but I don't think they retail it. Some of the reconing parts suppliers sell smalll bottles of it.
 
Re: recone glue

Bennett Prescott said:
Hey Ivan,

I'm just curious, I've never re-coned but I have worked with a lot of epoxies. Usually the shorter curing epoxies are stronger, the longer cure times are mostly to allow you additional positioning time. Have you found this to not be the case?
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I have found the opposite- for instance:
JB-Weld 2 part Epoxy- Temperature (max.):600 °F (316*°C) at 10 minutes
Tensile strength: 3,960 psi, Adhesion: 1,800 psi, Flex strength: 7,320 psi

JB-Kwik 2 part Epoxy Temperature (max.):300 °F (149*°C)
Tensile strength: 2100 psi, Adhesion: 1,800 psi, Flex strength: 7,320 psi

The faster epoxy fails at half the temperature and tensile strength.
 
Re: recone glue

I cannot speak to any particular brand, but in general, slower curing epoxies "should" build higher molecular weight polymers and therefore have higher temperature resistance and stronger tensile strength from a chemistry standpoint, but with the exception of a short industry piece I sometimes use when teaching about polymers, I haven't look into it with too much detail lately.
 
Re: recone glue

Art Welter said:
I have found the opposite- for instance:
JB-Weld 2 part Epoxy- Temperature (max.):600 °F (316*°C) at 10 minutes
Tensile strength: 3,960 psi, Adhesion: 1,800 psi, Flex strength: 7,320 psi

JB-Kwik 2 part Epoxy Temperature (max.):300 °F (149*°C)
Tensile strength: 2100 psi, Adhesion: 1,800 psi, Flex strength: 7,320 psi

The faster epoxy fails at half the temperature and tensile strength.
Click to expand...
I'm with Art on this. It was not the strength that I issues with-but rather the temp. The slower temp stuff could stand higher temps.

I also used the slow stuff for gluing magnets that had shifted-back together. I did not have a "recharger" so I did it with the magnets full strength. NOT for the faint of heart-you can easily lose a finger if you slip. But we never had an accident.
 
Re: recone glue

those eminence recone kits *can* be a bit tricky... my first 5 recone attempts ever were with those guys. the retailer I purchased from shipped the kits with CP moylan RS 3087 rubber resin cement (on the latter 3, not the first 2), and that seemed to work well as long as you were patient and let the driver do its thing for a couple days without moving etc.

loctite also supplies this PDF for reconing

http://sds.loctite.com/us/content_data/LT3273_Speaker_Assembly_Adhesives_Guide.pdf

I will say, as a word to the wise, be careful when using CA glue and the bonding VC to spider/cone step. my second attempt ever reconing actually resulted in me gluing the VC in the voice coil gap (it dripped down in the 5 seconds it took to cure) :(, and wow was that a headache (needless to say I had to scrap the attempt and reorder a recone kit). I ended up spending many hours scraping the vc gap with little bits of aluminum to remove the excess CA (after I pried the voice coil out of the gap) then blowing them clean with a compressor.

the Preassembled ones are much easier. If I end up blowing more drivers up, I'll likely make a jig for whatever driver I am reconing and assembling the eminence kits before actual driver installation.
 
Re: recone glue

Just got em re-mounted. Thanks for all the advice guys. That was def a bit of a task. I did use the shims they shipped with but like you said assembling the pieces in the basket was not that enjoyable.
 
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