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 Post subject: Drop(ped) Top
PostPosted: Fri Jun 19, 2020 8:17 pm 
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Mahogany
Mahogany
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Joined: Sat Nov 19, 2011 2:20 pm
Posts: 50
First name: Mark
Last Name: Chinworth
City: Kirkwood
State: MO
Zip/Postal Code: 63122
Country: United States
Focus: Build
Status: Amateur
This is what happens when you drop your nearly finished guitar body onto a concrete workshop floor.
After two months of grumbling, and laying down padded carpeting, I have a basic plan: Replace the top.
Any other recommendations? Should I complete the new top before removing the old or vice-versa? I plan to harvest the rosette and reuse it for the new top. I doubt any bracing or the bridge plate can be saved.

Procedure outline:
1. Route off the binding and purfling with a bearing bit just a tad less depth than the top thickness.
This will leave behind the side purfling and some of the binding, but that will be taken off later.
2. Continue the route inward until I'm past the width of the kerfed lining.
3. Sharp razor to slice the tiny remaining fibers between the top and lining.
4. Put the body back into the mold and sand with radius dish to fresh lining wood.
5. Make new top.
6. Glue top to sides.
7. Flush route the top to the sides.
8. Route off remainder of old binding and side purfling.
9. Glue in new binding and purfling.
10. Clean up and sanding.

Anything else?


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 Post subject: Re: Drop(ped) Top
PostPosted: Fri Jun 19, 2020 10:41 pm 
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Old Growth Brazilian Rosewood
Old Growth Brazilian Rosewood
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Joined: Fri Nov 02, 2007 9:49 am
Posts: 13391
Location: Ann Arbor, Michigan
First name: Hesh
Last Name: Breakstone
City: Ann Arbor
State: Michigan
Country: United States
Status: Professional
Sorry this happened to you Mark but it sounds like you have a great plan to make it right. You will also not be sorry that you replaced the top. Your workmanship and planning is excellent and it's my guess that you will have a guitar to be proud of.

My only suggestion is while the top is off you will have a great opportunity to be absolutely sure that none of the other braces are loose. When a guitar gets dropped loose braces are pretty common.


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 Post subject: Re: Drop(ped) Top
PostPosted: Fri Jun 19, 2020 10:55 pm 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Tue May 13, 2008 10:44 am
Posts: 6256
Location: Virginia
Oh man! Sorry to hear. Great looking binding too. This too shall pass. Sounds liek you have your head on straight.


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 Post subject: Re: Drop(ped) Top
PostPosted: Fri Jun 19, 2020 10:59 pm 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Wed Feb 20, 2008 7:15 pm
Posts: 7380
First name: Ed
Last Name: Bond
City: Vancouver
Country: Canada
Focus: Build
Status: Professional
This might help...

http://grevenguitars.com/retopping-demo.html


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 Post subject: Re: Drop(ped) Top
PostPosted: Sat Jun 20, 2020 7:00 am 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Sun Mar 30, 2008 8:20 am
Posts: 5968
Looks like a nice top. Any chance you could make a smaller instrument with the undamaged part?
If you have some matching wood you could patch in the top or do a "cranked bevel" a la Mike Doolin.
http://acousticguitarconstructionforum. ... php?t=2988


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 Post subject: Re: Drop(ped) Top
PostPosted: Sat Jun 20, 2020 12:50 pm 
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Contributing Member
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Joined: Thu Feb 09, 2006 2:35 pm
Posts: 2951
Location: United States
First name: Joe
Last Name: Beaver
City: Lake Forest
State: California
Focus: Build
Been there, done that. Mine was on a refinish job. It bounced around some and managed to destroy the headstock, sides, and the back. I didn't take a picture, figured it would be better to forget....

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 Post subject: Re: Drop(ped) Top
PostPosted: Sat Jun 20, 2020 1:02 pm 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Tue May 13, 2008 10:44 am
Posts: 6256
Location: Virginia
meddlingfool wrote:


That's the method I use, works great.

Clay S. wrote:
Looks like a nice top. Any chance you could make a smaller instrument with the undamaged part?
If you have some matching wood you could patch in the top or do a "cranked bevel" a la Mike Doolin.
http://acousticguitarconstructionforum. ... php?t=2988


Every time I have had to do this I have made a smaller guitar with the top. An 000 becomes an 00.


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 Post subject: Re: Drop(ped) Top
PostPosted: Mon Jun 22, 2020 5:50 am 
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Koa
Koa

Joined: Sun Apr 25, 2010 4:46 pm
Posts: 527
First name: Mark
Last Name: McLean
City: Sydney
State: New South Wales
Zip/Postal Code: 2145
Country: Australia
Focus: Build
Status: Amateur
Quote:
Procedure outline:
1. Route off the binding and purfling with a bearing bit just a tad less depth than the top thickness.
This will leave behind the side purfling and some of the binding, but that will be taken off later.
2. Continue the route inward until I'm past the width of the kerfed lining.
3. Sharp razor to slice the tiny remaining fibers between the top and lining.
4. Put the body back into the mold and sand with radius dish to fresh lining wood.
5. Make new top.
6. Glue top to sides.
7. Flush route the top to the sides.
8. Route off remainder of old binding and side purfling.
9. Glue in new binding and purfling.
10. Clean up and sanding.

Anything else?


11. Be careful not to drop it again


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 Post subject: Re: Drop(ped) Top
PostPosted: Mon Jun 22, 2020 8:50 am 
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Brazilian Rosewood
Brazilian Rosewood
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Joined: Thu Feb 12, 2009 12:12 pm
Posts: 3293
First name: Bryan
Last Name: Bear
City: St. Louis
State: Mo
Country: USA
Focus: Build
Status: Amateur
I'm sorry that happened Mark. It was looking really good too. I'm sure your recovery will be well executed.

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Bryan Bear PMoMC

Take care of your feet, and your feet will take care of you.


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 Post subject: Re: Drop(ped) Top
PostPosted: Mon Jun 22, 2020 9:57 am 
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Contributing Member
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Joined: Thu May 12, 2005 5:46 am
Posts: 2969
Location: United States
I have used the procedure you describe a couple of times and have been able to reuse the rosette as well. Works well. I have not tried John Grevens technique but it would be nice not to have to replace the binding. I'm pretty sure I'm not as skilled as John :)

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Jim Watts
http://jameswattsguitars.com


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 Post subject: Re: Drop(ped) Top
PostPosted: Mon Jun 22, 2020 12:38 pm 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Tue May 13, 2008 10:44 am
Posts: 6256
Location: Virginia
Jim Watts wrote:
I have used the procedure you describe a couple of times and have been able to reuse the rosette as well. Works well. I have not tried John Grevens technique but it would be nice not to have to replace the binding. I'm pretty sure I'm not as skilled as John :)


It truly is surprisingly easy to do.


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 Post subject: Re: Drop(ped) Top
PostPosted: Mon Jun 22, 2020 12:43 pm 
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Contributing Member
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Joined: Thu May 12, 2005 5:46 am
Posts: 2969
Location: United States
Alright I'll have to give it a try, I have a candidate for it now.

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Jim Watts
http://jameswattsguitars.com


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