The Acoustic Guitar Forum

Go Back   The Acoustic Guitar Forum > General Acoustic Guitar and Amplification Discussion > Build and Repair

Reply
 
Thread Tools
  #1  
Old 04-22-2017, 01:02 PM
Darryl Hattenha Darryl Hattenha is offline
Registered User
 
Join Date: Apr 2017
Location: Phoenix, AZ USA
Posts: 10
Default Jumbo 12-string Neck removal despite epoxy.

If a neck is glued in with epoxy, can you remove it it? Would you have to take off the back and gouge out the neck block etc?
__________________
D. Hattenhauer
Phoenix, AZ USA
Reply With Quote
  #2  
Old 04-22-2017, 03:58 PM
thomasfelty thomasfelty is offline
Registered User
 
Join Date: May 2013
Posts: 55
Default

The first guitar I built was from a David Russel Young book. The neck didn't have a tenon or dovetail but was a butt joint that you used epoxy to affix to the body. To remove the next he said to hit the neck hard near the joint and that would break the glue joint. It worked. I did have to re glue a small peace of the side back in place. I did remake the neck with a tenon and used hanger bolts to tighten it to the head block. If you have a tenon that is been glued in place I think you'll have to use heat to loosen the joint. I don't know of any solvent that will soften the epoxy. Good luck.
Reply With Quote
  #3  
Old 04-22-2017, 04:57 PM
Darryl Hattenha Darryl Hattenha is offline
Registered User
 
Join Date: Apr 2017
Location: Phoenix, AZ USA
Posts: 10
Default

Thanks, Thomas. There's hope.
__________________
D. Hattenhauer
Phoenix, AZ USA
Reply With Quote
  #4  
Old 04-22-2017, 05:23 PM
Howard Klepper Howard Klepper is offline
Registered User
 
Join Date: May 2008
Location: Earthly Paradise of Northern California
Posts: 6,305
Default

Is this the neck that is to be replaced because it's broken in three places?

Saw it off, then rout a new dovetail mortise.

Many epoxies can be softened with heat, but the problem is getting enough heat into neck joint without also disassembling the block from the top and sides and back.

Why do you think it was epoxied? Guild didn't do that.
__________________
"Still a man hears what he wants to hear, and disregards the rest."
--Paul Simon
www.klepperguitars.com
Reply With Quote
  #5  
Old 04-22-2017, 05:59 PM
Darryl Hattenha Darryl Hattenha is offline
Registered User
 
Join Date: Apr 2017
Location: Phoenix, AZ USA
Posts: 10
Default

Thanks, Howard.

I don't know if it's epoxy or not, but somebody did a bad neck reset, and I suspect it's epoxy.

If the neck gets put in with routing and a new mortise, would it show? (Sorry if that's a dumb question.)
__________________
D. Hattenhauer
Phoenix, AZ USA
Reply With Quote
  #6  
Old 04-22-2017, 11:27 PM
John Arnold John Arnold is offline
Registered User
 
Join Date: Jan 2009
Posts: 2,406
Default

There are methods to do this. I prefer removing the fingerboard and drilling into the joint with a long, thin drill bit (~ 1/16" diameter). You can remove the whole fingerboard, or cut it and just remove the section over the joint. Instead of cutting the fingerboard at the body junction, I prefer to cut it 2 frets up the neck. With a 14-fret neck, that means cutting at the 12th. This allows the fingerboard to overlap the joint when it is reassembled, which will be stronger.
I drill 4 or 5 times on each flank of the dovetail, then apply heat. If the end of the dovetail is glued, I drill there, too. If it is epoxy and not some other glue, I don't use water.
When the neck is reglued, the drilled surfaces are leveled, and thick shims are installed to compensate for the material removed by drilling. Most every dovetail reset involves installing shims, or replacing thin shims previously installed with thicker ones. At this point, the only difference from a conventional reset is the thickness of the shims.
This method has been successful on older Yamaha's, which are notoriously difficult to remove by steam injection.
Quote:
If the neck gets put in with routing and a new mortise, would it show?
No. The dovetail is smaller than the neck heel....usually at least 1/8" on each side. Guilds have wide heels like Gibsons.....much wider than the dovetail at the bottom. So even if the newly cut mortise in the neck block is slightly larger, it still will be covered by the neck heel.
Reply With Quote
  #7  
Old 04-23-2017, 11:21 AM
Darryl Hattenha Darryl Hattenha is offline
Registered User
 
Join Date: Apr 2017
Location: Phoenix, AZ USA
Posts: 10
Default

Many thanks, John. Now all I have to do is rob a bank to pay for this.
__________________
D. Hattenhauer
Phoenix, AZ USA
Reply With Quote
  #8  
Old 04-24-2017, 09:33 PM
Mr Fingers Mr Fingers is offline
Registered User
 
Join Date: Jan 2017
Location: Santa Barbara, CA
Posts: 809
Default

Howard Klepper is correct about epoxy yielding to heat. It softens somewhat and then breaks down (with an obnoxious smell) into a white powder. I removed a heavily epoxied saddle (!!) from a slotted bridge by using a soldering iron. Took 2 hours. If you cannot get a controllable heat source right onto the epoxy, this will not work. I would be tempted to do as some suggest -- cut the neck off, repair/redo the joint -- a dovetail or mortise if you want, but even a bolt system is possible -- and reattach. Good luck. I, too, built my first good guitar from the David Russell Young book, and it has a butted, epoxied neck joint. I took the time to fit it properly, and it hasn't budged in... 42 years!
Reply With Quote
  #9  
Old 04-24-2017, 09:37 PM
Darryl Hattenha Darryl Hattenha is offline
Registered User
 
Join Date: Apr 2017
Location: Phoenix, AZ USA
Posts: 10
Default

Thanks, Mr Fingers. I had heard that epoxy made things impossible, but now I'm feeling like this job is going to happen
__________________
D. Hattenhauer
Phoenix, AZ USA
Reply With Quote
Reply

  The Acoustic Guitar Forum > General Acoustic Guitar and Amplification Discussion > Build and Repair

Tags
epoxy

Thread Tools



All times are GMT -6. The time now is 09:23 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright ©2000 - 2017, The Acoustic Guitar Forum
vB Ad Management by =RedTyger=