Don Antonio de Torres Jurado eventually settled for a 32.5 X 2 = 65 cm. for the guitar’s string length. Modern guitars range from 64 to a 66.6 or even 67 cm. string length but the 65 cm. established by Torres is a very often used standard.
Hi,
A lot of work has gone into this post. I can't say I have read it completely as it is late at night, but I have read some interesting material and have heard some great playing. Being late I am just going to get into your quote above on string lengths.
Over the past number of years the accepted "normal" scale length has been 65cm for the classical guitar. My understanding or my experience was that the longest scale lengths were in the 660-664mm range during the 1960s and 70s. I am curious about the time frame when the norm for the classical guitar was an amazing 70cm long!
I purchased what I thought was a normal guitar, 663mm, in the mid 70s only to find out a few years ago that the scale length was far too long for my stature, thus had trouble playing it and I gave up guitar for many years, mostly because of my difficulty playing the 663mm.
I picked up the guitar again about 3 years ago only to realize, because of this forum, that my 663mm was too big for me. I sold it and purchased a more playable and enjoyable full body 630mm!
Cheers
ashepps wrote: ↑Sun Jul 30, 2017 4:49 amHi ashepps and thanks for your comment.Over the past number of years the accepted "normal" scale length has been 65cm for the classical guitar. My understanding or my experience was that the longest scale lengths were in the 660-664mm range during the 1960s and 70s. I am curious about the time frame when the norm for the classical guitar was an amazing 70cm long!
I purchased what I thought was a normal guitar, 663mm, in the mid 70s only to find out a few years ago that the scale length was far too long for my stature, thus had trouble playing it and I gave up guitar for many years, mostly because of my difficulty playing the 663mm.
I picked up the guitar again about 3 years ago only to realize, because of this forum, that my 663mm was too big for me. I sold it and purchased a more playable and enjoyable full body 630mm!
Cheers
Speaking of norms concerning the 70 cm scale length, I would like to add that it was only an experimentation that was applied in very few guitars compared with the whole guitar production and of course, it proved as an experimentation that it is not such a comfortable scale length of strings, even for long handed guitarists.
Before the work of Don Antonio de Torres Jurado, the 620, 630, 635, 640 mm etc. scale legths were some of the common scale lengths of the luthiers of the time, excluding some exceptions. Torres tried himself different scale lengths, since he was a great experimenter and inventor but however, he settled with great insistance on the 650 mm scale length in most of his concert and other cheaper models he produced.
This stabilization of the string length scale to 650 mm by Torres was not at random or luck or even obsession. Torres had found the ideal string length that would give him the best acoustical results, exactly because of the fact that Torres had invented the Mathematical Model of the Guitar (that I found, published and presented internationally in 1982), that is built according to the scale length of the string. If the scale length of the string changes then every other dimension of the body of the guitar changes in a mathematical analogous manner, in the Mathematical Model.
However, out of the numerous equations that are formed within the Mathematical Model, 8 (eight) of these equations happen to be exact by
+ or - 0.125 of a cm only when the scale length is exactly 650 mm. If the scale length is up or down 1 mm from 650 mm the eight equations lose completely the approximation of +or - 0.125 cm and these equations do not exist as functional. So, Torres did not find the 650 mm as a magical or mysterious number that really functioned acoustically but he had concrete mathematical proof that 650 mm was the ideal scale length of strings so that the Mathematical Model of the Guitar (that he also invented to form the whole planntilla/outline of the body of the guitar) included the most possible functional equations.
However, many guitars are built which are more than 650 mm or less, as your last guitar as you write, which is 630 mm and you are happy with it, which makes me also glad. So, when one designs and constructs strings, one must take into account in the string design and construction that one fabricates for guitars that have a range of scale lengths from 630 or 640 mm to 670 mm at least and this is where there is an added difficulty in the string designing and constructing stage and process. My strings have a range of 620 to 668 mm, where the 668 mm becomes 670 if one adds the 2 mm approx. compensation of the bridge saddle.
Best regards,
Georgios (Yorgos)
Alan,ashepps wrote: ↑Sun Jul 30, 2017 4:35 pmGeorgios,
...One thing in your reply indicated that strings should be made for the scale length. Is there something you can suggest for my 630 range or does it really matter? I have been using good standard tension strings and are working out well, no buzzing, is there something better?
Thanks again for the response and I do hope you get more responses on your initial post. When I glanced at it last night at 2am (AST) or so was too late to really take it in and have not re-read it. Hopefully I will!
Cheers,
Alan
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