Official Luthiers Forum!

Solely owned and operated by Lance Kragenbrink
It is currently Mon Dec 11, 2017 12:18 pm


All times are UTC - 5 hours


Forum rules


Be nice, no cussin and enjoy!




Post new topic Reply to topic  [ 8 posts ] 
Author Message
 Post subject:
PostPosted: Sat Jan 12, 2008 11:39 pm 
Offline
Koa
Koa

Joined: Sun Sep 04, 2005 3:20 pm
Posts: 632
Location: United States
Just an interesting issue. I have had two backstrips on two different guitars start to delaminate - very minor but for example, the one strip is like standard Martin style checker made of maple and perharps ebony. I noticed cracks along the strip in different areas. Wicked in some Cyano very carefully and then level with razor blade (and ends taped). Not real concerned about finish because plan on re-doing back anyways - french polish.

My point is - wonder if others see this problem from time to time. Bought the back strips from either Stew Mac or LMI so good quality. Thhinking that in the future, after backstrips are installed and prior to refinish maybe it is a good idea to flood with Cyano and sand as prevention.


Top
 Profile  
 
 Post subject:
PostPosted: Sun Jan 13, 2008 12:04 am 
Offline
Koa
Koa

Joined: Thu Feb 17, 2005 3:38 pm
Posts: 1542
Location: United States
HI Rich
    I to had that problem . What I have been doing since is to wick CA into the back strip after glue up. Didn't see on since. I don't know what caused it , or why
john


Top
 Profile  
 
 Post subject:
PostPosted: Sun Jan 13, 2008 2:18 am 
Offline
Koa
Koa

Joined: Sun Sep 04, 2005 3:20 pm
Posts: 632
Location: United States
Thanks John and Todd.

Todd, both strips were inlaid into the back vs. sandwiched between the back plates. No concern about structure since the back strip is in place doing its job.

John, I thought at first might have been humidity change but you would think it would have showed in other areas. I dont usually buy my backstrips just in time for build so guessing they were sitting in the same encvironment for months at a minimum.

Oh well, wicking in the cyano and leveling worked out well and resulted in a near invisible repair. It could have been invisible but I wasnt concerend as planning to add finish.


Top
 Profile  
 
 Post subject:
PostPosted: Sun Jan 13, 2008 5:50 am 
Offline
Koa
Koa

Joined: Wed Aug 24, 2005 11:13 am
Posts: 1398
Location: United States
Another good reason to pore fill with epoxy...


Top
 Profile  
 
 Post subject:
PostPosted: Sun Jan 13, 2008 7:15 am 
Offline
Cocobolo
Cocobolo

Joined: Sat Aug 25, 2007 12:59 pm
Posts: 241

I think this may be dryness Rich and the backstrip did it's job which is to provide an area that can move instead of the back plates cracking.


Recently I've also changed from using a cross grained reinforcement strip on the inside to one with the grain parallel to the back grain. Romanillos explained that this is to provide a place which will crack prior to the back plates under extreme conditions. As you have now experienced, it is far easier to repair and hide a crack in the strip than the surface of the plate.   


Best



Top
 Profile  
 
 Post subject:
PostPosted: Sun Jan 13, 2008 8:16 am 
Offline
Koa
Koa

Joined: Sun Sep 04, 2005 3:20 pm
Posts: 632
Location: United States
Thnaks Rich and Dave

Good insights from both of you. I tried the epoxy approach long time ago and made a mess of things but I often read how many have good results. Probably need to give it another try and read directions this time arond

Dave, running the inside center seam reinforcement parallel grain is an interesting idea. Makes good sense and might adopt this approach on my next build which is coming up soon.


Top
 Profile  
 
 Post subject:
PostPosted: Sun Jan 13, 2008 9:07 am 
Offline
Koa
Koa

Joined: Wed Aug 24, 2005 11:13 am
Posts: 1398
Location: United States
If you dome the back, shrinking is not much of an issue.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: Bing [Bot], bluezzer, edstrummer, joe white and 10 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