Search found 1413 matches

by Trevor Gore
Sun Mar 24, 2019 12:51 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Wood for Falcate Braces in UK
Replies: 4
Views: 66

Re: Wood for Falcate Braces in UK

Some spruce will heat bend and some won't. And you can't tell until you try. That's just how it is. None of the spruce I had would bend when I first tried making falcates. But I'd heard that spruce was heat bendable and without too much trouble. When I replenished my supplies, the new stuff would be...
by Trevor Gore
Wed Mar 20, 2019 10:10 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Carbon Fiber Sheet on Bridge Plate
Replies: 1
Views: 107

Re: Carbon Fiber Sheet on Bridge Plate

There are all sorts of arguments one could put up about whether the wood should be above or below the carbon, or even whether it need be there at all. The first time I did it, I did it as per the book, and it worked well, so I stayed with it. If you put the carbon on top, let us know how it goes. So...
by Trevor Gore
Wed Mar 06, 2019 6:27 pm
Forum: Instrument Builders Forum
Topic: Weird finishing problem
Replies: 10
Views: 478

Re: Weird finishing problem

Check with Tenacious Tapes whether or not K 750 contains silicones. Some tapes do and that would explain things.
by Trevor Gore
Mon Mar 04, 2019 11:36 am
Forum: Instrument Builders Forum
Topic: Acoustic cases
Replies: 5
Views: 365

Re: Acoustic cases

Hiscox for me.
by Trevor Gore
Sat Feb 23, 2019 1:00 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: To Add Side Weight or Not?
Replies: 2
Views: 195

Re: To Add Side Weight or Not?

Side mass mainly affects the T(1,1)2 resonance due to the nature of the momentum equilibrium between sides and top in that mode. Side mass will have no effect on multipole top resonances as the momentum equilibrium for those modes is maintained within the top alone. The first question when tuning mo...
by Trevor Gore
Mon Feb 18, 2019 1:09 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: First Attempts: Finding Target Thickness with Acoustics
Replies: 2
Views: 324

Re: First Attempts: Finding Target Thickness with Acoustics

In general I find the plots difficult to analyses. The book gives ranges of normal values which helps. I guess you are supposed to just ignore some of the noise in the first part of the plot. Like for example in the Fc plot that first peak around 50Hz, is that just a 'shadow' of the Flc peak coming...
by Trevor Gore
Wed Feb 13, 2019 3:54 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Adapting the method to multiscale and 7-strings?
Replies: 8
Views: 622

Re: Adapting the method to multiscale and 7-strings?

What about combining a Manzer wedge with a Gore rest, to reduce the overall width? You mean the Smith wedge :D ? I've done that. It seems to work fine. I got the impression from tap test results that the air resonance wasn't as strong, as the internal pressure wave didn't build as rapidly due to th...
by Trevor Gore
Tue Feb 12, 2019 5:51 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Adapting the method to multiscale and 7-strings?
Replies: 8
Views: 622

Re: Adapting the method to multiscale and 7-strings?

I'm sure Martin will have more to say regarding your questions, Mark. One thing though, I've found that arm bevels encourage your arm to damp the top, because the bevel brings the arm closer, whereas an arm rest moves it away. Bevels can look pretty cool, though, and offer an interesting build chall...
by Trevor Gore
Tue Feb 12, 2019 5:43 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Help with my spectrum
Replies: 4
Views: 421

Re: Help with my spectrum

AKEric wrote:
Sat Feb 09, 2019 5:22 am
...would you continue to relieve the back brace at this time, or wait until the bridge and saddle are attached?
I'd leave it at the moment. It gives you more options later.
by Trevor Gore
Wed Feb 06, 2019 9:11 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Help with my spectrum
Replies: 4
Views: 421

Re: Help with my spectrum

Eric, check out Fig. 4.6-3 in the Design book, Section 2.4.1.2 and Appendix VI.
by Trevor Gore
Wed Feb 06, 2019 8:49 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Falcate braces - radiusing?
Replies: 7
Views: 472

Re: Falcate braces - radiusing?

The falcate braces aren't shaped on their side that glues to the soundboard. A better, more conforming surface is produced just by planing them flat. Spring-back hasn't ever been an issue for me.
by Trevor Gore
Tue Feb 05, 2019 12:33 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: SS Falcate Guitar
Replies: 1
Views: 222

Re: SS Falcate Guitar

Ron, I don't sell other plans. The book is intended to be a guide that provides all the necessary information for anyone to design any type of "flat top" guitar. The plans in the book are there primarily as examples of how that can be done. So my recommendation would be to get your pencil out (or dr...
by Trevor Gore
Tue Feb 05, 2019 12:25 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: reproducibility... or copy... of early build
Replies: 1
Views: 175

Re: reproducibility... or copy... of early build

The book discusses in detail how guitars make sound. Guitars radiate sound from their vibrating parts, mainly the top. If a guitar top vibrates in a different way, it produces a different sound. The different ways a guitar top vibrates are called modes, and there aren’t that many of them. If the mod...
by Trevor Gore
Tue Jan 29, 2019 12:18 pm
Forum: Instrument Builders Forum
Topic: Spectra question
Replies: 17
Views: 1495

Re: Spectra question

That's good progress, Jim and the FRC looks a lot more real than before. What Figs 2.4-13 and 2.4-14 show is how the FRC changes when the amplitude of different "sources", in this case the sound hole and the top, change in relative magnitude. Normally, the T(1,1)1 is lower in amplitude that the T(1,...
by Trevor Gore
Thu Jan 24, 2019 6:49 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Steel String Chladni Patterns
Replies: 3
Views: 416

Re: Steel String Chladni Patterns

I tested a "guitar" box built for construction demonstration purposes at the recent modal tuning course. The top was around 4mm thick. It was really hard to get any Chladni patterns going compared to more normally constructed guitars. For classicals I have no problem getting patterns up to nearly 1 ...
by Trevor Gore
Tue Jan 22, 2019 9:03 pm
Forum: Instrument Builders Forum
Topic: Spectra question
Replies: 17
Views: 1495

Re: Spectra question

Jim,

Check out Figs 2.4-13 and 2.4-14 and captions. Then tell me what you think!

Cheers, T.
by Trevor Gore
Mon Jan 14, 2019 9:34 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: My first frequency spectrum
Replies: 9
Views: 701

Re: My first frequency spectrum

Your density and elastic moduli are OK; your thickness calc is wrong. Should be 0.02857 not 0.2857 as the first constant in the denominator. There may be other errors, but that's the one I can see. Correct answer is 2.71mm (on my workings!) so you will know when you're right. Also use the data in Ta...
by Trevor Gore
Sun Jan 13, 2019 10:41 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: My first frequency spectrum
Replies: 9
Views: 701

Re: My first frequency spectrum

Looks about right, but I don't know the dimensions of the wood.

Regarding the mic etc. issues, what sound card and software are you using?
by Trevor Gore
Sat Jan 12, 2019 11:06 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Bolt on bolt off neck - order of operations
Replies: 41
Views: 5103

Re: Bolt on bolt off neck - order of operations

I can't for the life of me find a reference to the depth of this router cut... Section 20.3.2, penultimate paragraph. So the bridge is currently 10 mm thick and the slot is 8 mm deep. Is that sufficient meat in the bottom? I wouldn't be worrying about it. The other thing is, the low E string is, du...
by Trevor Gore
Sat Jan 12, 2019 10:46 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Steel String Chladni Patterns
Replies: 3
Views: 416

Re: Steel String Chladni Patterns

I can't say I've noticed much difference, though there probably is one. Twice the power would only be another 3dB. I'll have the gear out next w/e, so I'll see if I find any difference.
by Trevor Gore
Sun Jan 06, 2019 10:37 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Bolt on bolt off neck - order of operations
Replies: 41
Views: 5103

Re: Bolt on bolt off neck - order of operations

The simple option is to do nothing. Once strung up the nut will sit there quite happily. A single drop of superglue could be used to prevent it dropping out whilst stringing. If you want to retain a channel, the challenge is keeping the bottom of the slot flat. Whatever you do, don't remove all the ...
by Trevor Gore
Wed Jan 02, 2019 9:58 am
Forum: Instrument Builders Forum
Topic: Some mandolin thoughts
Replies: 3
Views: 854

Re: Some mandolin thoughts

Nice work, Peter. It seems that the principles in the book can be applied across a whole range of stringed instruments comprising a ported box and strings - which isn't surprising, really. All that changes is the scale (as in size).
by Trevor Gore
Sun Dec 23, 2018 9:29 am
Forum: Instrument Builders Forum
Topic: Compensated nut WIP
Replies: 19
Views: 2047

Re: Compensated nut WIP

I run a clearance over the 2nd fret of .006" on the 6th string and .004" on the Ist, with the 3rd fret capo'd, and still get those sharp notes on some open chords. Should I take the clearances even lower before going further with the making of this compensated nut ? I try to run the fret surfaces a...
by Trevor Gore
Sat Dec 22, 2018 4:48 pm
Forum: Instrument Builders Forum
Topic: Compensated nut WIP
Replies: 19
Views: 2047

Re: Compensated nut WIP

Is that reference from one of your books ? Which one ? Yes, the Design book as Col mentioned. Apologies, I jumped to the assumption that as you were messing with nut compensation you would already have them. There's a 25 page chapter on compensation and intonation (Section 4.7, Design) with a few d...
by Trevor Gore
Fri Dec 21, 2018 10:22 am
Forum: Instrument Builders Forum
Topic: Compensated nut WIP
Replies: 19
Views: 2047

Re: Compensated nut WIP

donnyb wrote:
Thu Dec 20, 2018 9:25 pm
First up...re the scale length, where does the number 1.0595 fit with quote "12th root of two and some are real rule of 18" ?
See Section 4.6.6, Design.