Search found 1610 matches
- Fri Apr 09, 2021 6:02 pm
- Forum: Instrument Builders Forum
- Topic: Finger pressure
- Replies: 6
- Views: 5713
Re: Finger pressure
If you have the 2nd edition of the books, check out Appendix V (not in Ed. 1) p. AV 2. You're probably better off measuring string displacement rather than pressure applied and p. AV 2 explains how to do this.
- Sat Apr 03, 2021 3:44 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Can you derive a freq plot from a sound clip?
- Replies: 8
- Views: 9533
Re: Can you derive a freq plot from a sound clip?
...And that got me thinking... can you use a high quality sound clip of an instrument and use it to figure out the freq plot?... As John Parchem has said, every played note contains an embedded impulse response. The best way I've found to derive a frequency response curve is to isolate a single not...
- Tue Mar 16, 2021 7:45 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Compenstaed nut jig
- Replies: 7
- Views: 9253
Re: Compenstaed nut jig
Trevor if by chance you read this I wonder what cutter you use? CMT 1/8" two flute solid carbide down spiral. A new one can be pretty aggressive, so I use ones passed down from other operations (e.g. rosette channel cutting). I run a low speed on Tusq, otherwise it melts. Bone could be run at a hig...
- Wed Mar 03, 2021 12:17 pm
- Forum: Instrument Builders Forum
- Topic: Airbrushing lacquer vs HVLP
- Replies: 17
- Views: 12755
Re: Airbrushing lacquer vs HVLP
I've sprayed lacquer with an airbrush, touching up the edges of fret boards. It works fine, but you need a big nozzle (for an air brush) and need to spray wet or the lacquer will dry before it hits the target. It's not the tool to use for a whole instrument, though. I've had an HVLP touch up gun (1....
- Sat Jan 30, 2021 10:18 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Intonation and Flamenco guitars
- Replies: 4
- Views: 6082
Re: Intonation and Flamenco guitars
This type of discussion can get very fraught very quickly. The outcome of the argument depends on what going-in assumptions you consciously and/or unconsciously make. Consider a couple of things: 1) Nut compensation works because it means you have to change the string tension (re-tune) to get the op...
- Mon Jan 18, 2021 9:12 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Plate target thickness of non rectangular plates using deflection testing
- Replies: 11
- Views: 15833
Re: Plate target thickness of non rectangular plates using deflection testing
It's not that hard to get the cross grain stiffness using deflection methods. The pics here are of my old deflection jig as they show the technique better. First the jig. Note that the support tubes themselves are longer than the panel is. DSCF6101s.jpg Here's the normal arrangement for measuring lo...
- Fri Jan 15, 2021 8:52 am
- Forum: Instrument Builders Forum
- Topic: Red gum
- Replies: 28
- Views: 31181
Re: Red gum
Yep, that looks fine. Gerard would have been using nitro over a grain filler, which may well look different from an (oil?) varnish.
- Wed Jan 13, 2021 8:19 am
- Forum: Instrument Builders Forum
- Topic: Red gum
- Replies: 28
- Views: 31181
Re: Red gum
Give Gerard a call. iirc, what he told me was a) it is not very stable in guitar sized panels, so prone to cracking and b) whilst the grain in most woods is enhanced with finish, in red gum any figure seems to disappear under finish. But best to check with Gerard as I have one set, but have not buil...
- Tue Jan 12, 2021 10:42 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Richlite & primary bracing
- Replies: 5
- Views: 16528
Re: Richlite & primary bracing
I've never tried Richlite or Rocklite, so no view from me on that. Regarding the rebates, classical or steel string, they should be tight. Don't forget the thickness of the carbon cloth in the SS situation. One way of getting the rebates to fit well is to leave the braces a little tall, cut the reba...
- Wed Jan 06, 2021 9:00 am
- Forum: Instrument Builders Forum
- Topic: New Luthier Tips du Jour video - Cedar vs. Spruce
- Replies: 13
- Views: 17981
Re: New Luthier Tips du Jour video - Cedar vs. Spruce
Yes, the highest amplitude peak. Useful for all sorts of things.
- Tue Jan 05, 2021 9:55 pm
- Forum: Instrument Builders Forum
- Topic: New Luthier Tips du Jour video - Cedar vs. Spruce
- Replies: 13
- Views: 17981
Re: New Luthier Tips du Jour video - Cedar vs. Spruce
I have some questions for Trevor....firstly, what VA setting give that particular frequency display. There's a row of tabs to the right of the ON button. One of them says "Freq. meter"... Second question, I have experimented with and measured as well as played a few guitars which have rather thin s...
- Mon Dec 21, 2020 8:58 pm
- Forum: Instrument Builders Forum
- Topic: Building a flamenco guitar
- Replies: 9
- Views: 9552
Building a flamenco guitar
A customer of mine decided to go the next step and build his own guitar, with a little help and advice from yours truly. Then he went one step further and made a compilation of the pics and vids he shot as he was building, and left us with some of his thoughts on the experience, for which I would li...
- Tue Nov 24, 2020 8:33 am
- Forum: Instrument Builders Forum
- Topic: More mandolin thoughts - the end result
- Replies: 13
- Views: 13904
- Sun Nov 22, 2020 10:19 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: 1. falcate braced classical
- Replies: 17
- Views: 29654
Re: 1. falcate braced classical
Yes. But remember there's a very wide spread of results in Fig. 4-4-9, and the size of the LTB makes quite a difference.
- Sat Nov 21, 2020 10:42 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Bridge rotation too high... countermeasures?
- Replies: 3
- Views: 5400
Re: Bridge rotation too high... countermeasures?
It doesn't look like anyone else has had this problem, Jurgen. I haven't. My ~15 year old prototypes are still all fine. It sounds like an assembly issue, though hard to figure what went wrong.
- Thu Nov 19, 2020 7:37 am
- Forum: Instrument Builders Forum
- Topic: It’s not your fault but
- Replies: 7
- Views: 8272
- Sun Nov 15, 2020 10:10 am
- Forum: Instrument Builders Forum
- Topic: Visual Analyzer set-up
- Replies: 21
- Views: 26898
Re: Visual Analyzer set-up
Also check out this thread and go to page 3: http://www.anzlf.com/viewtopic.php?f=33&t=3652
- Sun Nov 15, 2020 10:08 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Collecting Spectrographic data
- Replies: 62
- Views: 88322
Re: Collecting Spectrographic data
Also check out this thread: http://www.anzlf.com/viewtopic.php?f=1&t=7961&p=86157
- Tue Nov 10, 2020 9:45 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: 1. falcate braced classical
- Replies: 17
- Views: 29654
Re: 1. falcate braced classical
But in general I would like to know why the spreadsheet didn´t work for the classical guitar. In the meantime I built 4 steelstring acoustics using the spreadsheet and I always get good sounding guitars with resonance frequencies in the target area. Any comments on that from Trevor? I think John (P...
- Fri Nov 06, 2020 7:52 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Scalloping the lower bout transverse brace
- Replies: 6
- Views: 7317
- Thu Nov 05, 2020 1:59 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Scalloping the lower bout transverse brace
- Replies: 6
- Views: 7317
Re: Scalloping the lower bout transverse brace
If you don't know how far to go, don't scallop the back brace initially. Glue the back to the sides, take the assembly out of the mould and tap the back, which will give you the B(1,1) frequency. The B(1,1) sits a little higher in frequency than the T(1,1)3 on the fully assembled guitar. Scallop awa...
- Sat Oct 31, 2020 6:08 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Scalloping the lower bout transverse brace
- Replies: 6
- Views: 7317
Re: Scalloping the lower bout transverse brace
If you have the 2nd Edition, see Build, p. 12.11, esp. the last paragraph.
- Sun Sep 27, 2020 10:17 pm
- Forum: Instrument Builders Forum
- Topic: Repair in Melbourne
- Replies: 2
- Views: 3333
- Sun Sep 20, 2020 12:51 pm
- Forum: Instrument Builders Forum
- Topic: Classical Guitar Tuners Creaking and Binding Up
- Replies: 13
- Views: 12878
Re: Classical Guitar Tuners Creaking and Binding Up
You can also lube the wood bearing surfaces with wax (candle, paste, bees, carnauba. All seem to work OK). Keep the hole clearances to a minimum, and make sure they're clear of finish, buffing compound etc.. Also, depending on your tuners, some (most) are 10mm diameter barrels and so need a 10.3mm h...
- Sat Sep 05, 2020 9:47 am
- Forum: Instrument Builders Forum
- Topic: Soundboard Sonic Signature
- Replies: 17
- Views: 233426
Re: Soundboard Sonic Signature
The bridge weighed in at 35 grams, so quite heavy... Yes, that's over double what mine typically weigh. Is it much heavier than the bridges on the other guitars? Have you and O’Brien rescheduled your class dates yet from July 2020, early days I guess? No, not yet. Still too many unknowns, unfortuna...