Official Luthiers Forum!

Solely owned and operated by Lance Kragenbrink
It is currently Wed Dec 13, 2017 12:14 am


All times are UTC - 5 hours


Forum rules


Be nice, no cussin and enjoy!




Post new topic Reply to topic  [ 10 posts ] 
Author Message
PostPosted: Sat Sep 23, 2017 12:53 pm 
Offline
Koa
Koa
User avatar

Joined: Mon Jul 27, 2015 8:21 am
Posts: 846
First name: Brad
Last Name: Combs
Focus: Build
Status: Amateur
Hello,

Today I had the pleasure of removing threaded rod from a ukulele neck that I had epoxied into place using System Three epoxy. (It's a long story but I botched the placement) I put a heating iron on the rod and let it sit for about 10 minutes. I then was able to basically "unscrew" the threaded rod.

I was surprised to see this white fluffy material in the hole. I don't know if the epoxy only partially set or if that is what it looks like after being heated up? Anyone have experience with that?

Image

Brad

_________________
"Is this the one where I trot downfield and act like I'm lost ?" - Billy Bob



These users thanked the author bcombs510 for the post: Joe Beaver (Sun Sep 24, 2017 5:50 pm)
Top
 Profile  
 
PostPosted: Sat Sep 23, 2017 2:56 pm 
Offline
Koa
Koa
User avatar

Joined: Mon Jul 27, 2015 8:21 am
Posts: 846
First name: Brad
Last Name: Combs
Focus: Build
Status: Amateur
Also, epoxy will stick to itself, correct? Or will I need to widen the hole, plug it and redrill it?


Sent from my iPhone using Tapatalk

_________________
"Is this the one where I trot downfield and act like I'm lost ?" - Billy Bob


Top
 Profile  
 
PostPosted: Sat Sep 23, 2017 3:51 pm 
Offline
Cocobolo
Cocobolo

Joined: Sun Jun 21, 2009 6:14 pm
Posts: 438
First name: Mike
Last Name: Imbler
City: Wichita
State: KS
Zip/Postal Code: 67204
Country: usa
Focus: Build
I would hazard a guess that since you glued in the threaded rod it was a net fit with the epoxy, and as you unthreaded it (a whole lot of turns) it scraped the epoxy and the white fluff is "epoxy filings"
Mike

bcombs510 wrote:
Hello,

Today I had the pleasure of removing threaded rod from a ukulele neck that I had epoxied into place using System Three epoxy. (It's a long story but I botched the placement) I put a heating iron on the rod and let it sit for about 10 minutes. I then was able to basically "unscrew" the threaded rod.

I was surprised to see this white fluffy material in the hole. I don't know if the epoxy only partially set or if that is what it looks like after being heated up? Anyone have experience with that?

Image

Brad



These users thanked the author Imbler for the post: bcombs510 (Sat Sep 23, 2017 4:32 pm)
Top
 Profile  
 
PostPosted: Sat Sep 23, 2017 4:29 pm 
Offline
Koa
Koa
User avatar

Joined: Tue Nov 11, 2008 9:13 pm
Posts: 777
Location: Durango CO
First name: Dave
Last Name: Farmer
City: Durango
State: CO
That's definitely the look of roasted epoxy. Probably has a smell like death on a stick, right? I don't think roasted epoxy is epoxy anymore.
Epoxy is all mechanical bond. I'd get that crap outa there. You need some surface roughness and/or penetration into surrounding wood.
A dowll is a perfect long grain fill so plugging and starting fresh would be tempting.



These users thanked the author david farmer for the post (total 2): Hesh (Sun Sep 24, 2017 5:36 am) • bcombs510 (Sat Sep 23, 2017 4:32 pm)
Top
 Profile  
 
PostPosted: Sat Sep 23, 2017 4:33 pm 
Offline
Koa
Koa
User avatar

Joined: Mon Jul 27, 2015 8:21 am
Posts: 846
First name: Brad
Last Name: Combs
Focus: Build
Status: Amateur
Perfect. Thanks for that! I will plug it. The hole is just a smidge too big for a 5/16" dowel so I'll go a step bigger and cut a Mahogany plug for it. Appreciate the help!!


Sent from my iPhone using Tapatalk

_________________
"Is this the one where I trot downfield and act like I'm lost ?" - Billy Bob


Top
 Profile  
 
PostPosted: Sat Sep 23, 2017 5:26 pm 
Offline
Brazilian Rosewood
Brazilian Rosewood

Joined: Wed Apr 08, 2009 9:34 am
Posts: 2561
Brad, you need to enlarge the hole to make sure you will be "wood to wood". I would be wary of using epoxy to glue in a plug. I would absolutely use a mahogany plug and try to orient the grain in the same fashion as the hole. You can turn a plug on a drill press. I would glue it in with hide glue, but Elmer's woodworker's glue is also good. make sure the fitting is not REALLY tight, allow for the glue.
I have never had any use for epoxy except for inlay filler mixed with tempura powder or sanding dust...

_________________
J. Brentrup Guitars & Mandolins
http://www.brentrup.com



These users thanked the author Haans for the post: bcombs510 (Sat Sep 23, 2017 6:06 pm)
Top
 Profile  
 
PostPosted: Sat Sep 23, 2017 6:08 pm 
Offline
Koa
Koa
User avatar

Joined: Mon Jul 27, 2015 8:21 am
Posts: 846
First name: Brad
Last Name: Combs
Focus: Build
Status: Amateur
Thanks! I did open up the hole to 3/8 and cut a plug for it out of Mahogany. I didn't do a great job aligning the grain though. :( I put it in with titebond.

But, here it is... all plugged up with some additional relief chiseled in. I'll do a little flossing tomorrow and then drill a new hole for the threaded rod. Here's to hoping I don't botch the placement again!!

Image


Sent from my iPhone using Tapatalk

_________________
"Is this the one where I trot downfield and act like I'm lost ?" - Billy Bob


Top
 Profile  
 
PostPosted: Sat Sep 23, 2017 6:14 pm 
Offline
Brazilian Rosewood
Brazilian Rosewood

Joined: Wed Apr 08, 2009 9:34 am
Posts: 2561
Looks good Brad...
Hopefully the new hole won't fall on the joint.

_________________
J. Brentrup Guitars & Mandolins
http://www.brentrup.com



These users thanked the author Haans for the post: bcombs510 (Sat Sep 23, 2017 6:14 pm)
Top
 Profile  
 
PostPosted: Sat Sep 23, 2017 7:30 pm 
Offline
Contributing Member
Contributing Member

Joined: Fri May 09, 2008 2:25 pm
Posts: 1664
First name: George
City: Seattle
State: WA
Country: USA
Focus: Build
Status: Amateur
I've never built a ukelele, but that that looks good to me. Heck, I'd be confident about proceeding even if it were for a guitar.

_________________
George :-)



These users thanked the author George L for the post: bcombs510 (Sat Sep 23, 2017 7:36 pm)
Top
 Profile  
 
PostPosted: Sun Sep 24, 2017 11:02 am 
Offline
Contributing Member
Contributing Member
User avatar

Joined: Tue Aug 17, 2010 3:31 pm
Posts: 1431
First name: Kevin
Last Name: Looker
City: Worthington
State: OH
Zip/Postal Code: 43085
Country: USA
Focus: Build
Status: Amateur
Regarding epoxy sticking to itself.

According to this article, the ability diminishes the more cured the old epoxy is.

http://www.westsystem.com/instruction-2 ... -clamping/

_________________
I'm not a luthier.
I'm just a guy who builds guitars in his basement.
It's better than playing golf.



These users thanked the author klooker for the post (total 2): Joe Beaver (Sun Sep 24, 2017 5:50 pm) • bcombs510 (Sun Sep 24, 2017 11:43 am)
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 10 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: dofthesea and 11 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB® Forum Software © phpBB Group
phpBB customization services by 2by2host.com