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| Brace depth http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=28335 |
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| Author: | segovia [ Fri Jul 23, 2010 3:12 pm ] |
| Post subject: | Brace depth |
Hi I seem to posting quite a bit these days - sorry  I have cut some x braces 16mm * 8mm for a new OM - in the process of putting the radius on the braces I have managed to trim the depth down to about 13mm ! - is this borderline or should I re cut new braces - what is the minimum depth of a brace or is it suck it and see? J |
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| Author: | TonyKarol [ Fri Jul 23, 2010 3:37 pm ] |
| Post subject: | Re: Brace depth |
Should be OK if the top is left suitably stiff .. OMs can have 1/4 x 1/2 bracing anyway ... |
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| Author: | segovia [ Fri Jul 23, 2010 3:51 pm ] |
| Post subject: | Re: Brace depth |
TonyKarol wrote: Should be OK if the top is left suitably stiff .. OMs can have 1/4 x 1/2 bracing anyway ... I suppose it all boils down to the sq mm 1/4 * 1/2 = 80sq mm - so I suppose 10 * 8 would - should be the same J |
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| Author: | John Platko [ Fri Jul 23, 2010 4:33 pm ] |
| Post subject: | Re: Brace depth |
segovia wrote: TonyKarol wrote: Should be OK if the top is left suitably stiff .. OMs can have 1/4 x 1/2 bracing anyway ... I suppose it all boils down to the sq mm 1/4 * 1/2 = 80sq mm - so I suppose 10 * 8 would - should be the same J Well 10 * 8 gives 80 but if you're talking about getting the same stiffness as a brace that's tall and narrow with one that's shorter and wider then it doesn't boil down to sq mms. A brace twice as wide is twice as stiff, so far so good but the height doesn't work the same way. The stiffness is a cube function of the height. Double the height and the brace is eight times stiffer. That is, it will deflect 1/8 as much as one half as high. So loose a little height, loose a lot of stifness. John |
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| Author: | TonyKarol [ Fri Jul 23, 2010 6:00 pm ] |
| Post subject: | Re: Brace depth |
If i read it right, he says he has 8x13 left .. 1/4 x 1/2 is about 6.3 x 12.5mm .... its still in there .... |
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