Saddle compenstion, Gibson LG-1

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Saddle compenstion, Gibson LG-1

Postby Matt Atkinson » Tue Apr 16, 2019 11:08 am

Hi all, It's been a very long time since I posted anything here! Hope to hang around more for a while...

I have finished re-bracing a little LG-1 that my brother in-law was kind enough to give me. I was just going to fix a loose back brace but decided to x-brace the top as well. Pulled the back, braced and did a little cheater neck reset when gluing the back on again. Anyway, someone previously replaced the plastic bolt on bridge with rosewood and did a spectacularly lousy job so I have removed the bridge and will make a new one slightly larger to cover the gouged-in pencil marks left by the last guy :( Looking for numbers for saddle compensation to cut a new slot. I'm planning on using my saddlematic to locate, just wanting the correct adjustment info if anyone knows what's best. Thanks in advance!
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Re: Saddle compenstion, Gibson LG-1

Postby Barry Daniels » Tue Apr 16, 2019 11:11 am

Cumpiano's book states that you should add 0.15" to the scale length at the middle of the saddle.
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Re: Saddle compenstion, Gibson LG-1

Postby Bryan Bear » Tue Apr 16, 2019 11:35 am

I Stew Mac's fret position calculator (which is what I use to estimate how much compensation to build in) gives 24.836" for the treble e and 24.958" for the bass e using 24.75" as the nominal scale length. That would be an extra 0.086" on the treble side and and extra 0.208" on the bass side. That would average and extra 0.147" so right in line with the Cumpiano number Barry provided above. The Stew Mac calculator lists +or- 0.03" for compensation; 0.15 to 0.147 is a tenth of that margin. . .

Depending on what your scale length is (I was guessing at 24.75") the compensation will change a little bit. But, these are estimates to get you in the ballpark for final adjustment. If you plug in the values for martin short scale and long scale the difference is 0.002" treble side and 0.004" bass side. I can't reliably measure that closely on my shop made saddle-maticesque tool so I never really change the compensation unless I am using it for a drastically different scale.
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Re: Saddle compenstion, Gibson LG-1

Postby Brian Evans » Tue Apr 16, 2019 12:07 pm

This is the calculator that I use, I find it extremely accurate and takes a lot of different factors into account: https://www.liutaiomottola.com/formulae ... sation.htm

I actually use more than a few of the calculators and webpages that he has there, it's a great site.

Edit: I just read this scholarly article, linked from the above site: https://osf.io/bqzf4/ I not only understand nut compensation for the first time, he made it make intuitive sense, plus it shows that fussing obsessively with compensation is a losing game because in blind testing even expert players and luthiers can't tell the difference to a degree that matters. Neat experiment.
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