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Topic: where exactly is the string tension in (lap) guitars? |
Kristen Bruno
From:
Orlando, Florida, USA
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Posted 16 Apr 2009 11:06 am |
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I see so many different designs and shapes of guitars, necks and bodies. I have heard different things about the thickness and materials of a lap steel.
Where exactly is the tension exerted from the strings on the different types of guitars. Hollow bodies vs solid bodies etc. For example, how come the top (soundboard) of a hollow body guitar doesn't usually pop off? The bridge of my ovation (and many other guitars) is mounted to the top soundboard, which isn't as sturdy as the neck, yet it stays on. It certainly isn't as thick as the neck. So maybe the string force isn't that great? Also, the headstocks usually aren't as "hunky" as the body. Why don't they break off?
I am just trying to understand the phsics of the string tension. It seems the more i learn the more questions i have.
super kristen |
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Rich Hlaves
From:
Wildomar, California, USA
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Posted 16 Apr 2009 3:01 pm
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Good question, tough answer. Hollow body guitars have bracing under the top to stiffen the top so it does not deform from the tention of the strings. The position of the bracing and its design effects tone and how much tention can be put on the guitar in tolal. Many 12 string models have labels or stamps stating "use light or extra light guage strings only" due to the extra string tention of the additional 6 strings.I like to tune my 12 down a half step or so and use a capo.
Height of the strings also effects tention as the higher the strings are raised the greater the mechanical advantage (leverage) the bridge and nut have on the body and head stock.
In solid body designs, too much string tention is rarely a problem unless extremely heavy strings are used or improper tunings are choosen. Lap steels will in time develop a slight bow from string tention. some call this cabinet drop as the low spot will be in the middle of the bottom of the body.
All of this relates to quality built instruments however. The good stuff rarely fails unless defective from the start.
In hollow body acoustic instruments the best way to keep the top, bridge and neck joint in good shape is proper humidity. A dry guitar will develop a sunken top and may crack and have buzzy strings, a wet guitar will have a buldging top and may become unplayable due to high action. Humidity should be between 35 and 50% for best results.
best,
Rich |
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Kristen Bruno
From:
Orlando, Florida, USA
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Posted 17 Apr 2009 7:33 pm
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thanks
k |
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