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Me again - Bridge Question
http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=27283		 Page 1 of 1
Author:  Chad Thorne [ Thu May 06, 2010 10:03 am ]
Post subject:  Me again - Bridge Question
So I ripped the bridge off my lefty Simon and Patrick because I'm giving it to my son who plays righty so I'm replacing the bridge. I bought a replacement bridge from Allparts. It seems to fit precisely over the footprint of the old bridge. I assume that S&P doesn't make their own bridges but sources them from elsewhere, maybe even the same supplier Allparts uses. If this is so, can I also assume that if I glue down the new bridge precisely where the old bridge was, intonation will be 1) spot on; 2) close enough so I can adjust the difference at the bridge saddle? Thanks!
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Author:  Alain Moisan [ Thu May 06, 2010 10:07 am ]
Post subject:  Re: Me again - Bridge Question
2) close enough (I would think)

But you should be able to evaluate that yourself by looking at the saddle slot position of the right handed bridge. If the middle of the slot is at the same place than the middle of the slot on the left handed one, you should be good.
Author:  jfmckenna [ Thu May 06, 2010 10:30 am ]
Post subject:  Re: Me again - Bridge Question
I would not assume no. Just measure it to be sure. The mid point of the saddle needs to be about 3/32 longer then the scale length. If the saddle slot one the new bridge is not positioned exactly as it was on the old bridge, understanding that they are compensated at different angles, then it will not intonate.
Author:  Darryl Young [ Thu May 06, 2010 7:03 pm ]
Post subject:  Re: Me again - Bridge Question
Are you planning to replace the nut? You will be placing the small E string in the large E string slot and vice-versa. Neat way to fix the guitar for your son. I have an S&P that sounds and plays nice.
Author:  Chad Thorne [ Fri May 07, 2010 8:32 am ]
Post subject:  Re: Me again - Bridge Question
Being a lefty player, I'm pretty familiar with modding a guitar from right to left, so this is just the same. I already have a new nut and saddle, ready to go. But thanks for mentioning it, wanting to be sure I had my Ts crossed and my Is dotted - I appreciate it!

BTW, this IS the first time I've pulled a bridge off, and am feeling pretty good (and thankful!) about clean it came off.
Author:  Chad Thorne [ Mon May 10, 2010 12:05 pm ]
Post subject:  Re: Me again - Bridge Question
jfmckenna wrote:
I would not assume no. Just measure it to be sure. The mid point of the saddle needs to be about 3/32 longer then the scale length. If the saddle slot one the new bridge is not positioned exactly as it was on the old bridge, understanding that they are compensated at different angles, then it will not intonate.
Thanks! Which would make the entire measurement what? In other words, I don't know off the top of my head what the dreadnaught scale length is. Thanks again!
Author:  Chad Thorne [ Mon May 10, 2010 12:48 pm ]
Post subject:  Re: Me again - Bridge Question
Todd Stock wrote:
Or just full and recut the slot next time, avoiding the whole issue.
Didn't want to do that, this seemed easier for me.
Author:  Chad Thorne [ Mon May 10, 2010 12:55 pm ]
Post subject:  Re: Me again - Bridge Question
Chad Thorne wrote:
jfmckenna wrote:
I would not assume no. Just measure it to be sure. The mid point of the saddle needs to be about 3/32 longer then the scale length. If the saddle slot one the new bridge is not positioned exactly as it was on the old bridge, understanding that they are compensated at different angles, then it will not intonate.
Thanks! Which would make the entire measurement what? In other words, I don't know off the top of my head what the dreadnaught scale length is. Thanks again!
O.K., disregard; checked S&P's website, scale length on my guitar is 24.84". The ".84" doesn't help me, I'm not good with decimals; but if I put the new bridge precisely where the old one was, midpoint of the saddle slot is 24 and 31/32". Am I close?
Author:  Chad Thorne [ Mon May 10, 2010 8:50 pm ]
Post subject:  Re: Me again - Bridge Question
Todd Stock wrote:
24.84" + 3/32" = 24.93" to front edge of slot on center line of guitar; you are at 24.97" measured to the center of the slot, so in the ball park. Beginning to see why fill/reslot has it's attractions?
Not yet, but who knows? I may, before I'm through.
Author:  Chad Thorne [ Mon May 10, 2010 8:50 pm ]
Post subject:  Re: Me again - Bridge Question
Oh, and thanks, Todd!
Author:  Darrel Friesen [ Mon May 10, 2010 11:11 pm ]
Post subject:  Re: Me again - Bridge Question
Chad Thorne wrote:
Chad Thorne wrote:
jfmckenna wrote:
I would not assume no. Just measure it to be sure. The mid point of the saddle needs to be about 3/32 longer then the scale length. If the saddle slot one the new bridge is not positioned exactly as it was on the old bridge, understanding that they are compensated at different angles, then it will not intonate.
Thanks! Which would make the entire measurement what? In other words, I don't know off the top of my head what the dreadnaught scale length is. Thanks again!
O.K., disregard; checked S&P's website, scale length on my guitar is 24.84". The ".84" doesn't help me, I'm not good with decimals; but if I put the new bridge precisely where the old one was, midpoint of the saddle slot is 24 and 31/32". Am I close?


Real easy to convert decimals to fractions Chad. If you want 32nds, just multiply .84" by 32. If you want 64ths, multiply it by 64 and so on. To get back to decimals, divide the numerator by the denominator. It's just that easy. [:Y:]
Author:  Chad Thorne [ Mon May 10, 2010 11:29 pm ]
Post subject:  Re: Me again - Bridge Question
Wow, even I can do that! Thanks, Darrel!
Author:  Bailey [ Tue May 11, 2010 8:45 am ]
Post subject:  Re: Me again - Bridge Question
So....what method did you use to pop off your bridge? Did you heat it up and get a pallet knife under it?....or what? I noticed the bridge on my OM build from 2 months ago has a rear corner lifting.Then...further checking shows a corner on another one of my previous SS's lifting also. I used the same luthier white glue on both of those....Looks like I need to pop both off...clean up and re glue. Since these are both branny new guitars...I didn't want to try the block and hammer (Whack) method of bridge removal. I'll use titebond next time.
Kent
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