www.KitGuitarsForum.com

Learn to Kit Build a Guitar. Learn to Scratch Build a Guitar. Learn EVERYTHING Guitars Here!
It is currently Sun Sep 23, 2018 6:40 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 15 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: damaged dovetail
PostPosted: Sat Sep 15, 2018 1:43 pm 
Offline

Joined: Tue May 09, 2017 5:34 am
Posts: 35
Hi

This is the neck from an Airline 7032 (Harmony Sovereign clone). The dovetail tenon is slightly damaged on the very front.

Does it matter? Can I go forward with the neck reset without having to repair it or should I glue a piece in there and shape it?

No - I dont have the missing piece.

Thanks

-Pat


You do not have the required permissions to view the files attached to this post.


Top
 Profile  
 
 Post subject: Re: damaged dovetail
PostPosted: Sat Sep 15, 2018 7:22 pm 
Offline

Joined: Wed Aug 13, 2014 12:14 pm
Posts: 1110
I don't have enough experience to know, but in my ignorance I might do something like this. Uniformly shave some amount off the beat-up dovetail surface and glue on another face piece, making it thick enough to either cut away the bad areas entirely, or at least thick enough so it is sufficiently strong to bridge over the bad spots. I've drawn it going the full length, although I suppose it doesm't have to. It might be easier to cut it that way though.

Before doing this, I think I would wait for a second opinion. You may not need to do anything. I can't offer a solid opinion about that just from the pictures. but you most definitely do not need perfect mating surfaces.


You do not have the required permissions to view the files attached to this post.

_________________
Everybody is ignorant, only on different subjects. -- Will Rogers
There are lots of people who mistake their imagination for their memory. - Josh Billings
Anything is possible if you don't know what you are talking about.


Top
 Profile  
 
 Post subject: Re: damaged dovetail
PostPosted: Sat Sep 15, 2018 7:44 pm 
Offline

Joined: Tue May 09, 2017 5:34 am
Posts: 35
Thanks Mainegeezer - I should have clarified that picture a little. Its the top of the tenon that I am concerned about (circled in Red). The chunk half way down (circled in blue) I have that piece and will be gluiing it back on. The rest of the tenon is the way it was when it came out of the mortise.


You do not have the required permissions to view the files attached to this post.


Top
 Profile  
 
 Post subject: Re: damaged dovetail
PostPosted: Sun Sep 16, 2018 1:45 am 
Offline

Joined: Wed Aug 13, 2014 12:14 pm
Posts: 1110
If it's the way it appears to be, I don't think you need to worry about it. Put it together annd call it a day.

Perhaps, however, one one of the more experienced members will explain how they would do the repair, if one did want to repair it.
Y

_________________
Everybody is ignorant, only on different subjects. -- Will Rogers
There are lots of people who mistake their imagination for their memory. - Josh Billings
Anything is possible if you don't know what you are talking about.


Top
 Profile  
 
 Post subject: Re: damaged dovetail
PostPosted: Sun Sep 16, 2018 7:46 am 
Offline

Joined: Fri Mar 03, 2006 7:09 pm
Posts: 5699
Location: Hegins, Pa
I run into this pretty often and what I do is clean up the tenon and glue on an over sized shim , it should be fine I keep the angle of the original tenon.

_________________
John Hall
Blues Creek Guitars Inc
Authorized CF Martin Repair Center
Board of Directors of Association of Stringed Instrument Artisans
http://www.bluescreekguitars.com


Top
 Profile  
 
 Post subject: Re: damaged dovetail
PostPosted: Sun Sep 16, 2018 8:02 am 
Offline

Joined: Thu May 24, 2012 8:03 am
Posts: 920
Location: Chestertown Maryland
Remember that the bottom of the dovetail is the area that does the work. The force of the strings is trying to pull the bottom away from the body. The top area is being pushed in towards the body, so that area only needs to stabilize the joint.

Ed


Top
 Profile  
 
 Post subject: Re: damaged dovetail
PostPosted: Sun Sep 16, 2018 8:16 am 
Offline

Joined: Tue May 09, 2017 5:34 am
Posts: 35
Thanks everyone -

I didn't think it was too serious.

John I believe I will do what you suggest.

Thanks

-Pat


Top
 Profile  
 
 Post subject: Re: damaged dovetail
PostPosted: Tue Sep 18, 2018 7:36 pm 
Offline

Joined: Fri Mar 03, 2006 7:09 pm
Posts: 5699
Location: Hegins, Pa
actually the bottom of the dovetail doesn't or should not be in contact with the block. The dovetail is an interference fit joint. Martin only uses the sides of the dove tail. The joint needs to have clean contact on the sides. I only did a few thousand of these joints . I used to think early you want the dovetail to be perfect all around but that was proven wrong early.
I show this in this video
https://www.youtube.com/watch?v=FNcbA1P95KE&t=30s

_________________
John Hall
Blues Creek Guitars Inc
Authorized CF Martin Repair Center
Board of Directors of Association of Stringed Instrument Artisans
http://www.bluescreekguitars.com


Top
 Profile  
 
 Post subject: Re: damaged dovetail
PostPosted: Wed Sep 19, 2018 6:44 am 
Offline

Joined: Fri Mar 03, 2006 7:09 pm
Posts: 5699
Location: Hegins, Pa
Ed
did you mean the deeper part of the tenon ? Not the point of the vee.
in that point you would be 100% correct

_________________
John Hall
Blues Creek Guitars Inc
Authorized CF Martin Repair Center
Board of Directors of Association of Stringed Instrument Artisans
http://www.bluescreekguitars.com


Top
 Profile  
 
 Post subject: Re: damaged dovetail
PostPosted: Wed Sep 19, 2018 5:35 pm 
Offline

Joined: Thu May 24, 2012 8:03 am
Posts: 920
Location: Chestertown Maryland
John

The point of the V, the bottom half of the joint, is the one with the strain pulling on the dovetail. On the upper half, the cheeks of the neck, on the outside of the body just below the fretboard, the joint is pushed together.

That's why my single bolt down low in a bolted M+T neck works. I posed this idea in another forum and got a whole bunch of luthiers saying they do a singe bolt also.

Ed


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 15 posts ]  Go to page 1, 2  Next

All times are UTC - 5 hours [ DST ]


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:  
Powered by phpBB® Forum Software © phpBB Group