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| String length "shrinkage." http://mowrystrings.luthiersforum.com/forum/viewtopic.php?f=10101&t=53562 |
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| Author: | Colin North [ Wed Sep 30, 2020 2:42 am ] |
| Post subject: | String length "shrinkage." |
Well more guitar distortion really. Just checked the intonation on a 2 year old build. I was quite fussy setting this up originally, used a good tuner. Just checked it again yesterday, same tuner. and had to move the break points on the saddle back ~1 mm to get the intonation acceptably. Reset action and relief to original specs. No sign of cold creep/movement at the bridge. How much do your builds move??. |
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| Author: | Clay S. [ Wed Sep 30, 2020 9:39 am ] |
| Post subject: | Re: String length "shrinkage." |
It's hard to say how much - I've never really measured. I will say I have had to adjust the necks on some lightly built instruments to lower the action, because I didn't want to lower the saddle. Being "bolt ons" this was relatively painless. Two things I do now - less perimeter sanding and (almost unconsciously) over compensate the saddle slightly. When I sanded the perimeter to where I felt I was getting an extremely responsive plate the top would pull up enough over a few months to require resetting the action. I still use my fingertips to feel how the soundboard is reacting to various frequencies, but accept less forceful responses. I will also accept the 12th fret fundamental being a - little - flat initially - the overtones are going a little sharp anyway, and as you noticed, it is more likely the string will go sharp than go flatter. So I tend to build a little "heavier" than I used to and leave more wood in the plates. |
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| Author: | DennisK [ Wed Sep 30, 2020 10:37 am ] |
| Post subject: | Re: String length "shrinkage." |
If the neck comes off easily, see if there are indentations in the soundboard binding where the heel cheeks push into it. That's one of the reasons I dislike bolt-on necks. |
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| Author: | bobgramann [ Wed Sep 30, 2020 11:32 am ] |
| Post subject: | Re: String length "shrinkage." |
On my acoustics, I don’t do final setup until 2 months after I first string it up. The action sometimes raises as much as 3/64” due to a combination of truss rod settlement and bridge belly. I had one come back after 5 years where I had to fill and recut the saddle slot to restore intonation because the bridge had rotated a bit and the saddle was tilting slightly. That’s the price of a light build. |
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| Author: | meddlingfool [ Wed Sep 30, 2020 12:36 pm ] |
| Post subject: | Re: String length "shrinkage." |
Any bridge roll? 1mm ain’t a lot of rotation... |
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| Author: | Alan Carruth [ Wed Sep 30, 2020 3:08 pm ] |
| Post subject: | Re: String length "shrinkage." |
My guitar making teacher used to say that he never heard of a guitar getting longer as it aged. |
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| Author: | Dave m2 [ Tue Oct 06, 2020 12:18 pm ] |
| Post subject: | Re: String length "shrinkage." |
Apologies for restarting the thread... Colin that does seem quite a lot of shrinkage. I've just checked and G&G allow only .5 of a mm for body compression in their bridge placement calc. A falcate braced one I have been able to check after some months hadn't moved at all. Do you know how soon after stringing up you did the intonation? Dave M |
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| Author: | Colin North [ Tue Oct 06, 2020 12:53 pm ] |
| Post subject: | Re: String length "shrinkage." |
First time only a few days. |
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