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| 620mm scale CG plans ? http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=37165 |
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| Author: | JeffR [ Sun Jul 22, 2012 11:15 am ] |
| Post subject: | 620mm scale CG plans ? |
Looking for 620mm (7/8) scale plans with a standard type body style, not the narrow bouts of a Lacote. Searched the archives and also the GAL plans and have not seen any yet, but I'm only on my first cup of coffee  Any help would be greatly appreciated.
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| Author: | Michael.N. [ Sun Jul 22, 2012 12:15 pm ] |
| Post subject: | Re: 620mm scale CG plans ? |
Just scale down a full size modern Classical. At 620 mm the body length and the bouts are going to have to be reduced, otherwise you will end up with an odd looking instrument. |
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| Author: | Joe Beaver [ Sun Jul 22, 2012 1:09 pm ] |
| Post subject: | Re: 620mm scale CG plans ? |
I'm not aware of a reduced scale classical guitar plan, especially one that uses a full sized body. I would do as Michael suggested. If you want to maintain a standard body feel you can always just reduce the body lenght from the bridge forward. If you kept it full size the bridge will be about 1.5" forward of the optimum placement. I would consider leaving the lower bout in tact, scale out the new lenght from the bridge to the top of the body, and redraw that portion to look good to my eye. Just some Sunday morning thoughts |
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| Author: | Michael.N. [ Sun Jul 22, 2012 2:13 pm ] |
| Post subject: | Re: 620mm scale CG plans ? |
I think if you leave the lower bout as is, the bridge placement will be too far North of the widest point of the lower bout. I would probably take some off the length of the upper bout and some off the length of the lower bout. Reducing the width of the lower and upper bouts + pulling the waist in some. It doesn't have to be much but you should aim to keep things in some proportion. I could probably draw one up in a matter of minutes. |
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| Author: | Jeff Highland [ Sun Jul 22, 2012 4:15 pm ] |
| Post subject: | Re: 620mm scale CG plans ? |
Joe Beaver wrote: I'm not aware of a reduced scale classical guitar plan, especially one that uses a full sized body. I would do as Michael suggested. If you want to maintain a standard body feel you can always just reduce the body lenght from the bridge forward. If you kept it full size the bridge will be about 1.5" forward of the optimum placement. I would consider leaving the lower bout in tact, scale out the new lenght from the bridge to the top of the body, and redraw that portion to look good to my eye. Just some Sunday morning thoughts Joe, the bridge will only move forward by 15mm (650-620)/2 |
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| Author: | Joe Beaver [ Sun Jul 22, 2012 5:00 pm ] |
| Post subject: | Re: 620mm scale CG plans ? |
Jeff, You are right of course. Must have been to much Open this morning or not enough coffee |
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| Author: | JeffR [ Mon Jul 23, 2012 7:27 pm ] |
| Post subject: | Re: 620mm scale CG plans ? |
I asked this because this is only number 3 for me and I was afraid that even minor mistakes in scaling might affect the sound to a great degree. Would the soundboard and back be ever so slightly thinner ? This will not be a student guitar. I am building it for my brother, who is about to retire after teaching guitar over thirty years. And he owns a Hauser III. No pressure there  Jeff |
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| Author: | Joe Beaver [ Mon Jul 23, 2012 8:28 pm ] |
| Post subject: | Re: 620mm scale CG plans ? |
Jeff, So it is an accomplished player that wants this guitar. I assume he picked out the 620 scale. And I'm guessing he did so because of some great sounding short scale guitar he played once. If that is the case then you have your work cut out for you. Hopefully an experienced classical builder will come in and offer some advice. Good Luck! |
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| Author: | JeffR [ Mon Jul 23, 2012 9:32 pm ] |
| Post subject: | Re: 620mm scale CG plans ? |
Thanks Joe My brother is starting to get some arthritis and found a 620mm much easier to play, although he didn't care for the narrower neck. I don't want to build a butt ugly guitar, but the sound and playability come first in this case. Jeff |
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| Author: | Joe Beaver [ Mon Jul 23, 2012 10:00 pm ] |
| Post subject: | Re: 620mm scale CG plans ? |
Well then, if it was me, until I heard better, I would go with a successful body style,bracing pattern and just shorten it the required 15mm (assuming it is a 650mm plan) from the bridge to the 12th fret. You can use whatever fingerboard width he desires. I even put a slight radius in my classical finger boards but that is just me. The more I think about it the more anxious I am to hear how it comes out. Should be a good project !!! |
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| Author: | JeffR [ Tue Jul 24, 2012 10:00 pm ] |
| Post subject: | Re: 620mm scale CG plans ? |
Michael has been so kind as to draw up a plan. My brother picked out a nice bear claw top from Rudi a few years ago and I have a dark set of EIR to pair it with. I'm really looking forward to this build and perhaps I'll document it. Jeff |
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| Author: | douglas ingram [ Tue Jul 24, 2012 10:24 pm ] |
| Post subject: | Re: 620mm scale CG plans ? |
I was about to make some other suggestions, but if Michael has drawn up a plan for you I would trust his expertise. Otherwise I would have suggest one of the smaller bodied Torres guitars such as FE17 which would take the shorter scale nicely. Or A Panormo which is a 630mm scale and plays and sounds very much like a traditional Spanish guitar. |
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