Official Luthiers Forum!

Owned and operated by Lance Kragenbrink
It is currently Tue Nov 26, 2024 5:49 am


All times are UTC - 5 hours


Forum rules


Be nice, no cussin and enjoy!




Post new topic Reply to topic  [ 12 posts ] 
Author Message
PostPosted: Mon Apr 14, 2008 7:48 pm 
Offline
Cocobolo
Cocobolo
User avatar

Joined: Sun Jan 27, 2008 11:25 pm
Posts: 127
City: Grandfalls
State: Newfoundland
Country: Canada
Focus: Build
Status: Amateur
I just finished removing the French Polish from a guitar top...The top had some blemishes that I didn't like so I decided to redo it....I am not going to remove the bridge to do this.....The guestion is does anybody see any problems with French Polishing the bridge also...Larry.


Top
 Profile  
 
PostPosted: Tue Apr 15, 2008 8:24 am 
Offline
Old Growth Brazilian
Old Growth Brazilian

Joined: Tue Dec 28, 2004 1:56 am
Posts: 10707
Location: United States
Larry no problem in terms of do-ability. You will find it more difficult to body, spirit-off, glaze and polish up tight around the bridge. Take your time and pinch a point into the muneca to get into the 90 degree surface changes well. Try to avoid a build-up in the corners formed by the top and bridge. I am not going to kid you it is tough to get the 90 degree surface changes right. Especially small tight ones like bridge to top joints but it is more than do-able.


Top
 Profile  
 
PostPosted: Tue Apr 15, 2008 9:13 am 
Offline
Brazilian Rosewood
Brazilian Rosewood
User avatar

Joined: Thu Jan 06, 2005 7:29 am
Posts: 3840
Location: England
Larry, I always glue on the bridge and do the final top tuning before I French polish the soundboard, and find that the problems are more imagined than actual. Polishing into the corners is simply a matter of having a small and pointed muneca, I sometime, if I remember, make one with a felt wedge for the filler, this makes it easier. Don't worry too much about getting polish on the bridge, this is very easily scraped off with a scalpel blade once the polish is hard.

I've done about 30 like this and it bcomes second nature.

Colin

_________________
I don't believe in anything, I simply make use of a set of reasonable working hypotheses.


Top
 Profile  
 
PostPosted: Tue Apr 15, 2008 10:11 am 
Offline
Old Growth Brazilian
Old Growth Brazilian

Joined: Tue Dec 28, 2004 1:56 am
Posts: 10707
Location: United States
Colin S wrote:
Larry, I always glue on the bridge and do the final top tuning before I French polish the soundboard, and find that the problems are more imagined than actual. Polishing into the corners is simply a matter of having a small and pointed muneca, I sometime, if I remember, make one with a felt wedge for the filler, this makes it easier. Don't worry too much about getting polish on the bridge, this is very easily scraped off with a scalpel blade once the polish is hard.

I've done about 30 like this and it bcomes second nature.

Colin



Colin how do you handle spiriting off, stiffing and glazing with the bridge in place. do you crossgrain spirit-off and glaze up around the bridge?


Top
 Profile  
 
PostPosted: Tue Apr 15, 2008 12:49 pm 
Offline
Brazilian Rosewood
Brazilian Rosewood
User avatar

Joined: Thu Jan 06, 2005 7:29 am
Posts: 3840
Location: England
MichaelP wrote:
Colin S wrote:
Larry, I always glue on the bridge and do the final top tuning before I French polish the soundboard, and find that the problems are more imagined than actual. Polishing into the corners is simply a matter of having a small and pointed muneca, I sometime, if I remember, make one with a felt wedge for the filler, this makes it easier. Don't worry too much about getting polish on the bridge, this is very easily scraped off with a scalpel blade once the polish is hard.

I've done about 30 like this and it bcomes second nature.

Colin



Colin how do you handle spiriting off, stiffing and glazing with the bridge in place. do you crossgrain spirit-off and glaze up around the bridge?


Yes, Michael although I use a combination of directions at the start, I find it no problem at all, but I am a fanatical stiffer and glazer, and will probably spend as much time doing this as bodying. A lot of classical builders do this, I know Joshua puts the bridge on first to tune the top as I do, but I also do it with steel strings and I defy anyone to look at the finish and guess. With stiffing particularly I start with a fair degree of pressure and then gradually reduce it so that at the end of the session I'm just kissing the top. Don't forget that I never use abrasives after I start polishing.

It may be a policy that needs some experience with French polishing.

Colin

Colin

_________________
I don't believe in anything, I simply make use of a set of reasonable working hypotheses.


Top
 Profile  
 
PostPosted: Tue Apr 15, 2008 2:29 pm 
Offline
Koa
Koa
User avatar

Joined: Thu Mar 01, 2007 3:31 am
Posts: 587
Location: Tacoma, WA
A bit of a thread hijack here but I didn't think it necessary to start a completely new one on a similar topic. That being said, after a million back-and-forths, I have decided to go with a Tru-Oil finish of the entire guitar. In this case should I finish before the bridge is on or not? I understand the process of masking off and removing the finish for the bridge, so if that is the case I can certainly do it that way. But it sounds like some leave the bridge on for FP shellac... would it be similar with Tru-Oil? TIA

_________________
Time is a great teacher, but unfortunately it kills all its pupils - Louis Hector Berlioz

Chansen / C hansen / C. Hansen / Christian Hansen - not a handle.

Christian


Top
 Profile  
 
PostPosted: Tue Apr 15, 2008 3:08 pm 
Offline
Old Growth Brazilian
Old Growth Brazilian

Joined: Tue Dec 28, 2004 1:56 am
Posts: 10707
Location: United States
Chansen wrote:
A bit of a thread hijack here but I didn't think it necessary to start a completely new one on a similar topic. That being said, after a million back-and-forths, I have decided to go with a Tru-Oil finish of the entire guitar. In this case should I finish before the bridge is on or not? I understand the process of masking off and removing the finish for the bridge, so if that is the case I can certainly do it that way. But it sounds like some leave the bridge on for FP shellac... would it be similar with Tru-Oil? TIA


Chasen,
Somewhat the same. How the film builds and the application stroke is not exactly the same but for the most part all that has been mentioned here would still apply

Thanks Colin,
I have figured as much as that was the only way I have found to deal with the obstruction. You have to under stand I have had a ruler to back of my hand on more than one occasions by grandfather for stiffing or glazing against the grain on furnishing and cabinets as a youngster so my natural instinct is to avoid cross grain stiffing and glazing where possible.
:D


Top
 Profile  
 
PostPosted: Tue Apr 15, 2008 4:26 pm 
Offline
Cocobolo
Cocobolo
User avatar

Joined: Sun Jan 27, 2008 11:25 pm
Posts: 127
City: Grandfalls
State: Newfoundland
Country: Canada
Focus: Build
Status: Amateur
I always finish the polishing before I put on the bridge...In this case I wasn't pleased with the finish......A French Polish is not very forgiving if there are any flaws or blemishes but is very easy to redo....I decided to leave the bridge in place instead of removing it....I usually finish the bridge in lemon oil.....I was just wondering this time......Instead of masking the bridge...Does anybody just French Polish the bridge also......What would be the disadvantage of doing this...Larry


Top
 Profile  
 
PostPosted: Tue Apr 15, 2008 4:33 pm 
Offline
Brazilian Rosewood
Brazilian Rosewood
User avatar

Joined: Thu Jan 06, 2005 7:29 am
Posts: 3840
Location: England
Michael, to my mind once you have a decent build on the wood the grain direction becomes immaterial, the aim is to have a perfectly smooth surface which can be achieved in any direction.

Larry, if you want to FP the bridge, go ahead, I know a number of classical builders who do just that.

Colin

_________________
I don't believe in anything, I simply make use of a set of reasonable working hypotheses.


Top
 Profile  
 
PostPosted: Tue Apr 15, 2008 4:35 pm 
Offline
Old Growth Brazilian
Old Growth Brazilian

Joined: Tue Dec 28, 2004 1:56 am
Posts: 10707
Location: United States
I have on repair jobs and yes others do but a lot. Most just want a polished oil finish but my Bellucci is nitro'ed so it is just a personal preference thing. Nothing wrong with French polishing it [:Y:]

Steel string can be a bit of a headache because of the pin holes. but then again classical have a lot if edges to deal with.


Top
 Profile  
 
PostPosted: Tue Apr 15, 2008 4:46 pm 
Offline
Contributing Member
Contributing Member
User avatar

Joined: Mon Mar 19, 2007 7:05 am
Posts: 9191
Location: United States
First name: Waddy
Last Name: Thomson
City: Charlotte
State: NC
Focus: Build
Status: Semi-pro
I did, but I need to work on around the bridge some. Not as smooth there as other places. Still have a way to go though.

_________________
Waddy

Photobucket Build Album Library

Sound Clips of most of my guitars


Top
 Profile  
 
PostPosted: Wed Apr 16, 2008 10:37 am 
Offline
Cocobolo
Cocobolo

Joined: Mon Nov 19, 2007 7:56 am
Posts: 225
Location: United States
In the 1800's, Martin used french polish technique to finish their bridges, if you run into one of the rare ones that has not been sanded, or otherwise worked on, you'll not a nice look to the ebony that does not come from polishing alone.

Best
Bruce

_________________
Bruce Herrmann
"What lies behind us and what lies before us are tiny matters compared to what lies within us."


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 12 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: modkev and 33 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