#1
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Humidity or neck reset
Hi All
I’m a bit worried. My three guitars were over humidified over summer and all three gained high action. After taking action to control the room humidity (now at 50%) two of the guitars have come back to normal playability. However, one guitar still has a high action. The problem is that because I hardly play this one guitar I can’t remember whether or not the action was high prior to it being exposed to over humidity. When I place a straight edge on the fingerboard it hits just below the bridge and there is just less than 1/2 inch from the soundboard and bottom E measured at the bridge. I guess I’m stabbing in the dark asking this question but I’m wondering if it is actually a result of the over humidification then can it take some considerable time for it to come down — it’s been about 3 months since I got the room at the correct humidity. |
#2
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3 months is plenty of time. It probably had high action that you forgot about and maybe even got a bit worse. Probably best to take it into your qualified guitar tech to have a look at it.
How much saddle is protruding from the bridge and what is the string action height at the 12th fret for both E and e string? |
#3
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The action is currently at 2.5 mm (12th fret bottom E). The saddle looks low to me with about 2-3 millimeters left. In my view any lower would compromise break angle.
I tend to like low actions and my other acoustic are 2.2 millimeters. |
#4
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I would consider that action to be normal. You definitely have room on 3mm saddle to lower it. Don't forget if you lower the saddle 1mm the the action at the 12th fret will be lowered by half that at .5mm. A 2mm saddle should give you plenty of break. You don't need as much break as you may think. Carruth has done some studies on this that show very shallow break angles impart just as much energy to the top as steep ones.
And if it really bothers you then you could always cut keyhole slots and ramps. Still it's hard to diagnose stuff like this on the Internet, especially without pics. You might want to take it in to someone who can evaluate it. But by your description I think you would get away with a setup to lower your action forgoing a neck reset. |
#5
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Thanks very much for the reply — it sounds encouraging.
Could I ask; If a straight edge placed on the frets and then up to the bridge, am I correct in saying that if the edge of the straight edge falls below the plane of the bridge it is concrete evidence that a reset is due? According to Frets.com an additional measurement can be taken where you measure the distance between the soundboard and the bottom of the strings at the bridge and if that measurement is less than 1/2 inch then it is good evidence a reset is needed. Many Thanks. |
#6
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Quote:
https://www.taylorguitars.com/suppor...oms-wet-guitar Quote:
Honestly you guitar sound fine. I wouldn't bother trying to get that last 0.2mm out of it, but sounds like you easily could. Last edited by RalphH; 11-15-2019 at 10:14 AM. |
#7
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I think I agree with you and thanks. I would say that I reckon there’s a bit of scope to bring the saddle down so I may just do it but all things being equal it plays fine, there’s the correct amount of relief in the neck and its intonation is good.
I will just leave it and stop worrying. |
#8
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Quote:
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#9
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Quote:
The string height over the soundboard at the saddle is a general rule too. I build guitars to that spec but if you need to go 1mm below that then it's fine. I'd prefer not to go higher then that though personally. I just built a guitar that had what I perceived to be too much bridge rotation. The strings above the soundboard was 1/2 inch on the dot. I built a new bridge and reset the neck angle on it and the bridge rotation settled in at 1.7deg versus the 2.3 it was before. The guitar sounds incredibly better now and I don't have to worry about it's longevity. |
#10
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It is the height of the strings above the top that is important. Just under 1/2" is fine for most guitars. Regarding saddle height: you only need about 10 degrees of string break angle across the saddle, and I prefer 45 degrees or less, just to assure longevity of the bridge. It sounds like you may have a thick bridge (they do vary). Martin uses three bridge thicknesses to adjust for variances in the neck angle and amount of top belly: 5/16 (thin), 11/32 (standard), and 3/8 (thick). While a 11/32 bridge and a 5/32 saddle may be considered normal, you get the same string height with a 3/8 bridge and a 1/8 saddle, or a 0.400 bridge and a 0.100 saddle.
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#11
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One problem i typically come across when repairing, when an instrument has been over humidified or exposed to a wet enviroment for a period of time, permanent alteration to the top has been created.
Just returning it to the correct humidity is sometimes not sufficient enough of a repair, often you need to remove the bridge and reflaten the top, sometimes you need to replace braces. I have a guitar in at he momment that has been treated similiar to your descriptive, for me to repair as the top has been deformed, i need to remove the bridge, steam and flatten the top, replace one of the internal braces, fit a new bridge and then string it back up Steve
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