Official Luthiers Forum!

Owned and operated by Lance Kragenbrink
It is currently Mon Jul 15, 2024 4:13 pm


All times are UTC - 5 hours





Post new topic Reply to topic  [ 7 posts ] 
Author Message
 Post subject: Neck bolt pulled out
PostPosted: Wed Mar 20, 2024 7:22 am 
Offline
Koa
Koa
User avatar

Joined: Tue Feb 26, 2008 6:19 am
Posts: 1439
First name: Richard
Last Name: Hutchings
City: Warwick
State: RI
Zip/Postal Code: 02889
Country: United States
Focus: Build
Status: Amateur
Would the carpenters toothpick fix be good for this or something better?

_________________
Hutch

Get the heck off the couch and go build a guitar!!!!


Top
 Profile  
 
 Post subject: Re: Neck bolt pulled out
PostPosted: Wed Mar 20, 2024 7:39 am 
Offline
Cocobolo
Cocobolo
User avatar

Joined: Sun Jun 02, 2013 8:16 am
Posts: 434
First name: Brian
City: U.P.
State: Michigan
Focus: Build
I guess we gotta know how it was bolted on first. Was it a hanger bolt, a "furniture" bolt with an insert in the heel, a butt joint, a mortise and tenon, or... --- and how was it installed before it failed? Did it fail just sitting there or was there a fall or could it have been over tightened? Maybe a picture would help you get advice too.

_________________
Brian R, Wood Mechanic
N8ZED



These users thanked the author rbuddy for the post: Hesh (Wed Mar 20, 2024 8:30 pm)
Top
 Profile  
 
 Post subject: Re: Neck bolt pulled out
PostPosted: Wed Mar 20, 2024 9:14 am 
Offline
Koa
Koa
User avatar

Joined: Tue Feb 26, 2008 6:19 am
Posts: 1439
First name: Richard
Last Name: Hutchings
City: Warwick
State: RI
Zip/Postal Code: 02889
Country: United States
Focus: Build
Status: Amateur
Hanger bolted butt joint. It was stored in a bad environment and just pulled out from string tension.

_________________
Hutch

Get the heck off the couch and go build a guitar!!!!


Top
 Profile  
 
 Post subject: Re: Neck bolt pulled out
PostPosted: Wed Mar 20, 2024 10:10 am 
Offline
Cocobolo
Cocobolo
User avatar

Joined: Sun Jun 02, 2013 8:16 am
Posts: 434
First name: Brian
City: U.P.
State: Michigan
Focus: Build
If it were me, I'd consider switching to a threaded insert and furniture bolts. There just isn't a lot of holding power in a hanger bolt thread when it is going into a shallow heel in a butt joint, especially end grain.

How deeply did the screw end of the hanger bolt penetrate the heel?

_________________
Brian R, Wood Mechanic
N8ZED


Top
 Profile  
 
 Post subject: Re: Neck bolt pulled out
PostPosted: Wed Mar 20, 2024 1:26 pm 
Offline
Koa
Koa
User avatar

Joined: Tue Feb 26, 2008 6:19 am
Posts: 1439
First name: Richard
Last Name: Hutchings
City: Warwick
State: RI
Zip/Postal Code: 02889
Country: United States
Focus: Build
Status: Amateur
rbuddy wrote:
If it were me, I'd consider switching to a threaded insert and furniture bolts. There just isn't a lot of holding power in a hanger bolt thread when it is going into a shallow heel in a butt joint, especially end grain.

How deeply did the screw end of the hanger bolt penetrate the heel?


I'll answer this when I get it on the bench. It'll be a while.
Thanks

_________________
Hutch

Get the heck off the couch and go build a guitar!!!!


Top
 Profile  
 
 Post subject: Re: Neck bolt pulled out
PostPosted: Wed Mar 20, 2024 1:47 pm 
Offline
Koa
Koa

Joined: Mon Oct 17, 2011 4:10 pm
Posts: 674
First name: Bob
Last Name: Gramann
City: Fredericksburg
State: VA
Zip/Postal Code: 22408
Country: USA
Focus: Build
Status: Professional
A hanger bolt ought to grip pretty well. I usually use inserts and 1/4-20 bolts, but use hanger bolts when I expect greater stress. The hanger bolt goes deeper than the insert. I always put a 1/2” maple dowel in the heel with its edge a quarter inch back so there’s some cross grain for the insert or the bolt to grab. I don’t trust endgrain. If your hanger bolt had no cross grain to grab, I might consider removing the heel cap, drilling the heel, and installing a dowel. I usually have to turn the dowel down a bit to fit in a 1/2” drilled hole.


Top
 Profile  
 
 Post subject: Re: Neck bolt pulled out
PostPosted: Wed Mar 20, 2024 3:01 pm 
Offline
Koa
Koa
User avatar

Joined: Tue Feb 26, 2008 6:19 am
Posts: 1439
First name: Richard
Last Name: Hutchings
City: Warwick
State: RI
Zip/Postal Code: 02889
Country: United States
Focus: Build
Status: Amateur
I'll keep that in mind, thanks.

_________________
Hutch

Get the heck off the couch and go build a guitar!!!!


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 7 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 1 guest


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