I don't mind being common....
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| 9/16th height for x's? https://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=42404 |
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| Author: | meddlingfool [ Mon Jan 06, 2014 1:57 pm ] |
| Post subject: | 9/16th height for x's? |
I spent my holidays making up a router table and jigs for bulk producing braces. I had intended for the x's height at intersection to be 11/16", but somehow they end up at 9/16". I'm sure that's probably fine, but I'm curious to know, what are your starting height at intersection for your x braces? |
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| Author: | David Malicky [ Mon Jan 06, 2014 2:20 pm ] |
| Post subject: | Re: 9/16th height for x's? |
I think 9/16" is the most common height. |
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| Author: | meddlingfool [ Mon Jan 06, 2014 2:26 pm ] |
| Post subject: | Re: 9/16th height for x's? |
I don't mind being common....
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| Author: | theguitarwhisperer [ Mon Jan 06, 2014 2:40 pm ] |
| Post subject: | Re: 9/16th height for x's? |
Actually 9/16ths is fine. I start at 5/8ths, and carve down to 9/16ths, but if I need to leave them tall I can. |
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| Author: | John Arnold [ Mon Jan 06, 2014 2:44 pm ] |
| Post subject: | Re: 9/16th height for x's? |
With few exceptions, Martin 000 and dread x-braces are 5/8" tall at the intersection. 1/16" does not sound like much, but it is a huge difference in stiffness, which is proportional to the cube of the height. Martin D-35's sound different from D-28's....mainly because their braces are 9/16" tall. |
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| Author: | meddlingfool [ Mon Jan 06, 2014 5:59 pm ] |
| Post subject: | Re: 9/16th height for x's? |
Suppose I can just shim the bottom of the template.... |
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| Author: | arie [ Mon Jan 06, 2014 6:09 pm ] |
| Post subject: | Re: 9/16th height for x's? |
currently i'm at .75 x .22 approx. to start. with a parabolic profile and tapered and un-tucked. i tend treat guitars as individuals though -bulk isn't really my thing. |
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| Author: | Tom West [ Mon Jan 06, 2014 6:11 pm ] |
| Post subject: | Re: 9/16th height for x's? |
I'm at .625". Tom |
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| Author: | meddlingfool [ Mon Jan 06, 2014 6:34 pm ] |
| Post subject: | Re: 9/16th height for x's? |
I've got a lot of orders on the go. While I enjoy the whittling with the micro plane from Stephen Boone (it's actually my favorite part), it's time spent that's not really necessary. Especially since I try to make the taper as consistent as I can from guitar to guitar. If there is a need to deviate from that, I still have the planes. And since the height is the major adjuster and not the taper/bevel, it makes sense to me to have a bin of radiused and tapered brace stock ready to grab and glue... |
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| Author: | Pete Brown [ Mon Jan 06, 2014 11:51 pm ] |
| Post subject: | Re: 9/16th height for x's? |
Todd Stock wrote: The D-35s and D-35S's have 00 bracing, so closer to 1/2". Was shocked the first time I measured one, but the 1972 and 1974 D-35 and 1953 00-18 in the shop all are within a 1/64" of 1/2". Does not seem to be a big issue for most I've seen. A notable difference these days is that many of us cap the X-brace intersection which, I assume, has a significant effect on the stiffness of the top at that point. To what extent should this influence our design decisions where height at the brace intersection is concerned? |
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| Author: | meddlingfool [ Tue Jan 07, 2014 12:42 am ] |
| Post subject: | Re: 9/16th height for x's? |
Good question.... |
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| Author: | Ruby50 [ Tue Jan 07, 2014 9:20 am ] |
| Post subject: | Re: 9/16th height for x's? |
A couple of weeks ago I bought a 1934 Gibson L-00 for the princely sum of $41. Problem is that someone had punched through the back. However, this allowed me to get inside and measure the bracing and seeing this has changed my thinking. Check the picture - the top bracing is 3/16" at the base, a little big if 1/16" at the top, and 9/16" tall, including the "X". The back braces are 1/2" tall and a little wider, but no where near 1/4". of course this is a smaller guitar, and braces this light will effect the sound. Ed Minch |
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| Author: | meddlingfool [ Tue Jan 07, 2014 12:47 pm ] |
| Post subject: | Re: 9/16th height for x's? |
Well, I made some shims to modify the jig. UTB = .500 x .625 X's = .250 x .600 Dread, AJ, SJ, .250 x .560 OM and smaller. We've also started toying with deflection testing the brace stock too which has been illuminating... |
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