Search found 1608 matches
- Sat Aug 15, 2020 10:13 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: High frequencies
- Replies: 4
- Views: 9965
Re: High frequencies
Trevor, that was a great phone conversation! Very informative for a start. Thank you for your generosity! No worries, Ross! My guitar had resonances in pretty good places, and ate the Gibson for breakfast when compared! Mine was a a lot more bassy but not tubby, still a nice tight picking sound, so...
- Tue Jul 21, 2020 6:13 pm
- Forum: Instrument Builders Forum
- Topic: Classical Build (s) - Hopefully falcate!
- Replies: 96
- Views: 108147
Re: Classical Build (s) - Hopefully falcate!
Resonant frequencies are proprtional to SQRT(stiffness/mass); so.......
- Fri May 29, 2020 6:41 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: having a go at spectrums
- Replies: 11
- Views: 14611
Re: having a go at spectrums
The extra "grass" looks like you managed to score two taps in one buffer. Also possibly a bounce (essentially the same as two taps per buffer). One tap per buffer definitely gives cleaner plots. It takes a bit of practice.
- Fri May 29, 2020 6:31 pm
- Forum: Instrument Builders Forum
- Topic: The order of things ...
- Replies: 14
- Views: 16290
Re: The order of things ...
I wonder is it a steel string vs classical guitar thing? I k no w no-one who frets before gluing the fretboard? Yes, you do! :D One of the reasons for going to the BOBO neck joint (steel and classical) was so that I could fret the board fully before gluing it on. It is much easier to keep everythin...
- Mon May 25, 2020 9:40 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Starting out on J45
- Replies: 46
- Views: 187629
Re: Starting out on J45
10GPa. Don't go less than that, but stiffer is OK as you can always shave a bit off the tops of the two lower bout braces.
- Sat May 09, 2020 9:56 am
- Forum: Instrument Builders Forum
- Topic: Quality Machine heads
- Replies: 16
- Views: 13552
Re: Quality Machine heads
For steel string, I've bought one set of (old) Schallers ever, one set of Schaller Grand Tune ever (had to give them a second chance after many years) one set of Grovers ever, Waverly's only when the customer insists and countless sets of Gotohs of all sorts and never had a mechanical problem with a...
- Fri Apr 17, 2020 4:43 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Starting out on J45
- Replies: 46
- Views: 187629
Re: Starting out on J45
Best just to download Visual Analyser (for free) and follow the instructions in the Appendix. If you're using a Mac, you'll need an emulator type program so you can run Windows apps (Parallels or Wine seem to be the popular ones) or buy a cheap Windows PC. If you need further instruction, you can ge...
- Thu Apr 16, 2020 8:12 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Starting out on J45
- Replies: 46
- Views: 187629
Re: Starting out on J45
I must have read that bit last time and gone with the traditional 4 transverse braces of 6.3 wide on 2.8 mm thick mahogany - which, I hadn't understood, gives a 'live' back after all - a contribution to the sound from back vibration - which I take it is better and richer in complexity as long as (i...
- Thu Apr 16, 2020 8:36 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Starting out on J45
- Replies: 46
- Views: 187629
Re: Starting out on J45
In Section 11.2.2.13 I talk about the details of J45 back bracing. The "real" J45 has a live back and the live back is important for the reasons given in that section. So if you want to improve over your previous J45 I'd recommend going for a live back and the details of how to do that are also disc...
- Wed Apr 08, 2020 8:19 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Help to find details of Rosette Router Jig
- Replies: 5
- Views: 7401
Re: Help to find details of Rosette Router Jig
The "first block" (with the arrows drawn on in black felt tip) has a through hole for the shaft. The nuts are locked to the shaft, so the shaft is a tight rotating fit through that block. Both nuts in the larger central block are captive (and have Belville washers) so when the shaft is rotated this ...
- Tue Apr 07, 2020 9:56 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: having a go at spectrums
- Replies: 11
- Views: 14611
Re: having a go at spectrums
Depending on which version of Windows you have, there are different ways to control the gain. For VA 9.0.6 (which I use most of the time) the level controls in VA only work in Win XP. In later versions of Windows, you have to go to the Windows sound controller or other installed app (e.g. DTS Audio ...
- Mon Apr 06, 2020 9:10 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: having a go at spectrums
- Replies: 11
- Views: 14611
Re: having a go at spectrums
I made an attempt at spectrums just now and really don't know where to start... You can download the VA setup instructions from my website here . That should at least get you started! There is definitely quite a bit of "grass" on those plots, possibly due to too much gain as John suggested, but als...
- Mon Apr 06, 2020 8:49 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Abalone rosette measurements
- Replies: 2
- Views: 5469
Re: Abalone rosette measurements
On a steel string with a 102 mm sound hole (in the plan)... The falcate plan has a 95mm sound hole, which is what I had in mind when suggesting "something around 115mm". Your 121mm former should be OK for a 102mm sound hole, but best to get a compass and a piece of paper and draw it out to make sur...
- Mon Apr 06, 2020 8:38 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Help to find details of Rosette Router Jig
- Replies: 5
- Views: 7401
Re: Help to find details of Rosette Router Jig
Well, there's the pics in the 15th Aug 2018 post and also some in a post on Apr 7th 2018 and I think that is all I've posted on the subject on this forum. Anything on other forums will be much the same. I've never made drawings of the jig, but you should be able to replicate the main features from t...
- Mon Feb 03, 2020 9:52 am
- Forum: Instrument Builders Forum
- Topic: Qualities of Spruce
- Replies: 18
- Views: 29224
Re: Qualities of Spruce
Thanks, DaveO. ...But I have noticed slightly (non significantly) higher E long results comparing thin bracewood to wider soundboard stock, when comparing population with a simple t-test. My charts are from data made up primarily of sound board samples planed to ~ 4mm thick and measured for the elas...
- Sun Feb 02, 2020 11:35 pm
- Forum: Instrument Builders Forum
- Topic: Stain on soundboard
- Replies: 11
- Views: 14737
Re: Stain on soundboard
Bruce, I suspect that kind of staining came from the gig bag. Some time back a manufacturer was offering a "protective wrap" for a guitar for inside the case and it left marks like that, but fortunately it wasn't on one of my guitars. Whatever it was came out of the wrap and into the finish, though ...
- Thu Jan 30, 2020 10:18 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: High frequencies
- Replies: 4
- Views: 9965
Re: High frequencies
I was always lead to believe that anything above 1K really isn't worth worrying about. Happy to be proved wrong. Trevor?? It's certainly difficult to target specific modes of vibration up beyond 1k Hz, so it's down to doing things that support high frequencies generally, like keeping monopole mobil...
- Thu Jan 30, 2020 9:06 am
- Forum: Instrument Builders Forum
- Topic: Qualities of Spruce
- Replies: 18
- Views: 29224
Re: Qualities of Spruce
Thanks for posting that DaveO. I have a similar chart with a tighter spread, which just indicates that a lot of selection has gone into the wood before I measure it (so not a random sample). Also, the regression line is lower down the page in my results, indicating lower measured E long values. I pr...
- Fri Jan 03, 2020 8:44 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: VA plots for tap test on plates
- Replies: 13
- Views: 16689
- Wed Jan 01, 2020 12:06 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: VA plots for tap test on plates
- Replies: 13
- Views: 16689
Re: VA plots for tap test on plates
Fdiag should be an easy one to get, assuming you have the VA set up right. Hold the panel in the middle of the long side edge, tap lightly on a lower corner with the mic right behind the corner you tap. Often the problem is due to tapping too hard or not putting the mic where it can "hear" the vibes.
- Tue Dec 31, 2019 9:01 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Latest build final tap results
- Replies: 1
- Views: 5307
Re: Latest build final tap results
That looks close enough to ideal to leave it as is. Well done, Chris!
- Mon Dec 23, 2019 1:03 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Unusual Panal Size
- Replies: 6
- Views: 10273
- Mon Dec 23, 2019 8:38 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Unusual Panal Size
- Replies: 6
- Views: 10273
Re: Unusual Panal Size
For non-rectangular pieces, e.g. a rectangle with a corner cut off, choose a part of the panel that is rectangular and do a three point bend test on that part. Page 4.30 Design.
- Thu Dec 05, 2019 7:38 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Spectrum change with age
- Replies: 5
- Views: 9309
Re: Spectrum change with age
I've found that if I use "old" wood (that I've had for at least 5 years), the guitar seems to get louder with age but the spectrum remains much the same. If I use "new" wood, cut and dried for less than 2 years, the guitar gets stiffer as it ages and whilst the shape of the spectrum remains recognis...
- Fri Nov 22, 2019 7:57 am
- Forum: Instrument Builders Forum
- Topic: Searching for Carbon Fiber for a Falcate Guitar Build
- Replies: 4
- Views: 6477
Re: Searching for Carbon Fiber for a Falcate Guitar Build
These guys keep changing their name but are still in the same business and is where I've bought the CF products called for in the books. The cloth (1m wide) is much more economical to buy than tape (or was!). Give them a call and see if they still stock CF. https://allnex-brookvale.business.site/