Search found 1434 matches

by Trevor Gore
Sat May 11, 2019 6:24 pm
Forum: Instrument Builders Forum
Topic: Fine Tools Australia
Replies: 3
Views: 406

Re: Fine Tools Australia

Thank you gentlemen.
by Trevor Gore
Fri May 10, 2019 4:06 pm
Forum: Instrument Builders Forum
Topic: Fine Tools Australia
Replies: 3
Views: 406

Fine Tools Australia

Does anyone have a phone number for these guys (Melbourne based)?

https://www.finetools.com.au/

They don't seem to respond to email.

Thanks.
by Trevor Gore
Tue May 07, 2019 7:08 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Veritas scraper plane in lieu of high angle plane
Replies: 3
Views: 242

Re: Veritas scraper plane in lieu of high angle plane

To me (at least) high angle planes and scraper planes are very different beasts. I don't own a scraper plane (but I use card scrapers), I have 2 high angle planes and can configure 2 other planes as high angle planes. I find that if I can't do it (whatever "it" happens to be) with a high angle plane...
by Trevor Gore
Sun May 05, 2019 11:08 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Diamond stones for sharpening
Replies: 2
Views: 175

Re: Diamond stones for sharpening

DMT brand diamond "stones". The ones shown in the book have been superseded. I think shorter ones are available but not the ones in the book. The page I linked to has the alternative Duosharp stones. I have the blue and the green grades. They start very aggressive, but settle quickly. I've had mine...
by Trevor Gore
Fri May 03, 2019 12:21 am
Forum: Instrument Builders Forum
Topic: Slow neck carving
Replies: 21
Views: 1185

Re: Slow neck carving

No more than a couple of hours for me using the book procedure, and mainly spoke shaves, of which I have a few. I certainly wouldn't be game to use a draw knife on the figured wood I often use! "Normal" spoke shaves work well for removing the bulk of the wood. I use a high angle spoke shave on figur...
by Trevor Gore
Thu May 02, 2019 11:26 pm
Forum: Instrument Builders Forum
Topic: Luthier Sessions #2 - Hand Planing for Luthiers, by Trevor Gore
Replies: 3
Views: 477

Re: Luthier Sessions #2 - Hand Planing for Luthiers, by Trevor Gore

There's no heavy maths like the modal tuning course Martin, but there is some precision set-up for those who want precision results!
by Trevor Gore
Wed May 01, 2019 9:03 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: dB levels question?
Replies: 6
Views: 311

Re: dB levels question?

Well done, Chris! The numbers look good, but how does it sound?
by Trevor Gore
Tue Apr 30, 2019 8:40 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: dB levels question?
Replies: 6
Views: 311

Re: dB levels question?

Do the Books discuss varying dB levels in regard to the various T1, T2, T3s? All I say is that the dB level is uncalibrated. That is due to the uncontrolled tap strength and the recording environment (mic response, mic position, signal strength, room reflections, etc. etc.). To get calibrated dB le...
by Trevor Gore
Mon Apr 29, 2019 10:27 am
Forum: Instrument Builders Forum
Topic: Modal Tuning Course in Melbourne, June 2019
Replies: 0
Views: 265

Modal Tuning Course in Melbourne, June 2019

I will be running one of my 3 day Modal Tuning courses again in Melbourne in June. The course has proved to be very popular with Victorians! What we will cover: • How strings drive your guitar • Visualising and understanding modes of vibration • Relating modes of vibration to guitar frequency respon...
by Trevor Gore
Tue Apr 16, 2019 9:06 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Just closed the box - strategy?
Replies: 15
Views: 1121

Re: Just closed the box - strategy?

As long as you're having fun... :D
by Trevor Gore
Mon Apr 15, 2019 9:34 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Just closed the box - strategy?
Replies: 15
Views: 1121

Re: Just closed the box - strategy?

The audience will likely miss out on some bass response, but the player might not because the port will act as a "monitor" and so the player may hear a stronger bass. Maybe.
by Trevor Gore
Mon Apr 15, 2019 9:35 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Just closed the box - strategy?
Replies: 15
Views: 1121

Re: Just closed the box - strategy?

gerryt wrote:
Mon Apr 15, 2019 7:14 am
What I don't understand is why my T(1,1)1 is so high - currently at 109Hz
Well, don't forget the effect of the sound port. Depending on how big and whether you compensated by reducing the sound hole size, could be worth 5-10 Hz.
by Trevor Gore
Sun Apr 14, 2019 10:49 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Just closed the box - strategy?
Replies: 15
Views: 1121

Re: Just closed the box - strategy?

Taping bridges on doesn't tell you a whole lot. You add the mass but not the stiffness. The effect on the T(1,1)2 of adding bridges is shown in Fig. 4.6-3 (Design). For the T(1,1)1, adding the bridge typically raises its frequency a small amount on my guitars. Adding the stiffness reduces the amount...
by Trevor Gore
Sat Apr 13, 2019 5:20 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Just closed the box - strategy?
Replies: 15
Views: 1121

Re: Just closed the box - strategy?

You could "blind bind" the fretboard - bind in the same wood as the fretboard, no purfling lines. That covers the tangs. Leave the end unbound.

If you thicknessed the back according to the formula, working the back brace should get you there.
by Trevor Gore
Sat Apr 13, 2019 10:28 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Just closed the box - strategy?
Replies: 15
Views: 1121

Re: Just closed the box - strategy?

The plots don't look much like mine but I think we can work with them. It looks like the T(1,1)1 is close to 113 Hz and the T(1,1)2 is close to 200Hz. The B(1,1) is at 238Hz, which implies that the T(1,1)3 would be around around 240Hz or a couple of Hz higher, if it were there. I guess you're using ...
by Trevor Gore
Fri Apr 12, 2019 9:14 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Just closed the box - strategy?
Replies: 15
Views: 1121

Re: Just closed the box - strategy?

Gerry,

Check out the last line of the last paragraph, p AI-3, (Design) for guitar holding instructions whilst tapping, then post another tap plot.

Thanks, T.
by Trevor Gore
Mon Apr 08, 2019 10:25 pm
Forum: Instrument Builders Forum
Topic: Acoustical effect of back woods
Replies: 25
Views: 2432

Re: Acoustical effect of back woods

One can get very picky about the way these sorts of experiments are performed, but I'll try to stay away from that. However, trying to identify differences in sound due to the back woods when the T(1,1)1's and T(1,1)2's range over a semi-tone on non-live back instruments (no T(1,1)3's apparent, Fig ...
by Trevor Gore
Fri Apr 05, 2019 7:57 am
Forum: Instrument Builders Forum
Topic: Acoustical effect of back woods
Replies: 25
Views: 2432

Acoustical effect of back woods

According to the Journal of the Acoustical Society of America (of which esteemed body I am a member) one of the most downloaded articles from the last year published in The Journal of the Acoustical Society of America is this one: “Effect of back wood choice on the perceived quality of steel-string ...
by Trevor Gore
Thu Apr 04, 2019 6:59 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: T(1,1)2 and Back Question
Replies: 10
Views: 808

Re: T(1,1)2 and Back Question

Reducing to target thickness would remove about 20% of the thickness. That would of course reduce mass but also lower stiffness or is it safe to assume that the braces contribute to the majority of the stiffness? I would expect it to lower the frequency, but how much depends heavily on your bracing...
by Trevor Gore
Wed Apr 03, 2019 10:09 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: T(1,1)2 and Back Question
Replies: 10
Views: 808

Re: T(1,1)2 and Back Question

Kevin,

Check out pages 2-22 to 2-25 in Design (if you haven't already).
by Trevor Gore
Tue Apr 02, 2019 9:40 pm
Forum: Instrument Builders Forum
Topic: maton square head truss rod adjuster
Replies: 10
Views: 3327

Re: maton square head truss rod adjuster

Many, many years ago I made a Maton truss rod adjuster from a drum brake adjusting tool. It was a Z shaped tool with square sockets on each end, one of which was the right size. I chopped that end off and cut a slot in the stub so I could use it with a screw driver. Just did a Google search and coul...
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: 12
Views: 1042

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: 342

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: 1235

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: 808

Re: Acoustic cases

Hiscox for me.