Search found 1604 matches

by Trevor Gore
Wed Feb 01, 2012 7:53 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Equation 4.5-7
Replies: 55
Views: 60981

Re: Equation 4.5-7

Hi Scott, There's no doubt that Eqn. 4.5-7 is correct, so that only really leaves how you "read" the equation if you are getting consistently wrong results. If it were "fingering" problems, your results would be somewhat more random. The most frequent source of errors is getting the zero count wrong...
by Trevor Gore
Sun Jan 29, 2012 11:11 am
Forum: Instrument Builders Forum
Topic: Acoustic guitar pickups
Replies: 34
Views: 23497

Re: Acoustic guitar pickups

The conventional answer is two different instruments. Building electro-acoustics then leaving the electrics out and calling them acoustics is where most of the factory makers have gone wrong (well, one place they've gone wrong...). Another way of killing some feedback is to use in-ear monitoring rat...
by Trevor Gore
Sun Jan 08, 2012 11:09 am
Forum: Instrument Builders Forum
Topic: Another Odd Question
Replies: 16
Views: 11793

Re: Another Odd Question

I saw a "harlequin" classical guitar in a Sydney (Chatswood) store not long ago. I think it was rosewood/cypress alternate on the back and sides. Can't remember the brand.
by Trevor Gore
Fri Jan 06, 2012 9:28 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Nut and Saddle compensation
Replies: 8
Views: 11303

Re: Nut and Saddle compensation

Yes. I set it up with 12s, which is big for a twelve string, and tuned it to concert. Huge!

You need a good set-up, though, to do that and most people would prefer lighter strings. The one on the website had a double truss rod arrangement, too.
by Trevor Gore
Thu Jan 05, 2012 3:02 pm
Forum: Instrument Builders Forum
Topic: New Luthier Tips du Jour video - Tonewood
Replies: 19
Views: 16620

Re: New Luthier Tips du Jour video - Tonewood

For another perspective, try this:

http://scitation.aip.org/getpdf/servlet ... rog=normal

I'll defy anyone to accurately grade tonewoods by stiffness/density (E/ρ) by examining rough sawn lumber!
by Trevor Gore
Wed Jan 04, 2012 8:28 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Nut and Saddle compensation
Replies: 8
Views: 11303

Re: Nut and Saddle compensation

Hi Wes, One of the problems in writing large books is that occasionally the continuity isn't perfect! Ideally, Tables 4.7-3 and 21-2 should have been the same. As it happens, the guitar set-ups for the two tables were slightly different, with the example in Table 4.7-3 having slightly more neck reli...
by Trevor Gore
Tue Jan 03, 2012 10:52 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Falcate Lite
Replies: 7
Views: 8909

Re: Falcate Lite

A number of people have posed this question. The point about the CF is that it reduces cold creep. My thinking is that you would have to put a lot more wood in to get that benefit. Just compare the size of falcate braces to X braces, for example. Using the CF is not that hard. As you already have a ...
by Trevor Gore
Sat Dec 31, 2011 6:08 pm
Forum: Instrument Builders Forum
Topic: Curved frets
Replies: 20
Views: 15105

Re: Curved frets

The difference between long and short strings on a conventional guitar with straight frets is a maximum of ~0.15mm with an associated interval error of ~0.4 cents. You may just be able to see the curve in the frets (provided you don't have any spherical aberrations in your vision), but I doubt you'l...
by Trevor Gore
Tue Dec 20, 2011 12:29 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Soundports and tuning
Replies: 21
Views: 24548

Re: Soundports and tuning

Depending on how you braced the back, it is often possible to do it in situ. You can either cap the top of the existing brace or just put another one in just behind the first one. Usually the place that needs the extra stiffness is only the middle of the span. I'd be interested to hear your reaction...
by Trevor Gore
Fri Dec 16, 2011 12:36 pm
Forum: Instrument Builders Forum
Topic: Got to stop asking how it happens.
Replies: 21
Views: 16289

Re: Got to stop asking how it happens.

...about that dog...
Wet.jpg
Wet.jpg (4.06 KiB) Viewed 16014 times
Good fix BTW!
by Trevor Gore
Thu Dec 15, 2011 10:38 pm
Forum: Instrument Builders Forum
Topic: Got to stop asking how it happens.
Replies: 21
Views: 16289

Re: Got to stop asking how it happens.

Steve, you'll have to keep that dog of yours under control...
by Trevor Gore
Tue Dec 13, 2011 12:05 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Soundports and tuning
Replies: 21
Views: 24548

Re: Soundports and tuning

Quick answer is "No". I still haven't heard a guitar that sounds better for having a sound port. The audience always seems to get a raw deal; never as much projection. But that is just me listening rather than any more objective testing. Alan Carruth did quite a bit of work. Might be on his web site...
by Trevor Gore
Mon Dec 12, 2011 7:10 pm
Forum: The Gallery
Topic: The Patient
Replies: 9
Views: 10371

That's snatching victory from the jaws of defeat! Nice one!
by Trevor Gore
Mon Dec 12, 2011 7:02 pm
Forum: Instrument Builders Forum
Topic: Suitable Rock Maple alternative(?)
Replies: 19
Views: 19963

Re: Suitable Rock Maple alternative(?)

Sorry Dom, I can't really tell you anything more. Probably the best thing to do is to try and heat bend it. Cut a 15-20mm slice and thickness it to ~2.3mm, then try to heat bend it by hand. If you have no problem, it is the silver/linings stuff. If it's a real struggle and breaks on tight bends it's...
by Trevor Gore
Sun Dec 11, 2011 10:11 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: String spacing and neck width
Replies: 2
Views: 4879

Re: String spacing and neck width

Hi Dom, I typically run 46mm or 47mm at the nut for a fingerpickin' steel string guitar and 58mm string spread at the saddle. As it turns out, this also gives 58mm at fret 12 and these are my normal layout numbers. Measuring at fret 9, I get 56mm for the fretboard and 47mm string spread (centre to c...
by Trevor Gore
Sun Dec 11, 2011 3:55 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Best tuner
Replies: 7
Views: 10096

Re: Best tuner

I use AP tuner in that application: http://www.aptuner.com/cgi-bin/aptuner/apmain.html

If you run through the options you can see how all the harmonics rate, as well as the fundamental.

The price is good, too!
by Trevor Gore
Sat Dec 10, 2011 5:47 pm
Forum: Instrument Builders Forum
Topic: Amplification
Replies: 21
Views: 19390

Re: Amplification

The instructions use the pin holes to position the transducers. Any thoughts how to do it with a pinless bridge? Make yourself a set of locators - each a small piece of perspex or similar with a notch filed in which is the same diameter as the transducer. Stick the locators to the underside of the ...
by Trevor Gore
Sat Dec 10, 2011 10:20 am
Forum: The Gallery
Topic: "The Shed" guitar
Replies: 63
Views: 81435

Re: "The Shed" guitar

Personally, I like very responsive guitars, because on the rare occasions I get to play I'm a "bare hands" finger picker on steel strings (but more frequently classical, these days). However, it really is horses for courses. For a steel string finger picker I get highest monopole mobility and lowest...
by Trevor Gore
Wed Dec 07, 2011 11:00 am
Forum: The Gallery
Topic: "The Shed" guitar
Replies: 63
Views: 81435

Re: "The Shed" guitar

5Hz
by Trevor Gore
Tue Dec 06, 2011 9:06 pm
Forum: The Gallery
Topic: "The Shed" guitar
Replies: 63
Views: 81435

Re: "The Shed" guitar

Thanks to all who participated in this – greatly appreciated. First, a few more details about the guitars: Both are falcate braced. Both have live backs The bridges are near identical; consecutive slices off the block, same mass (11.5 grams) The strings are the same; Savarez 540J (High tension, “car...
by Trevor Gore
Tue Dec 06, 2011 6:18 pm
Forum: The Gallery
Topic: Bunya/Blackwood OM
Replies: 9
Views: 9397

Re: Bunya/Blackwood OM

Amazing effort! Takes a lot of "bottle" (as we used to say in the olde country) to use a top like that. Regarding bunya's properties, Bootle gives its Young's Modulus as 13GPa, but I've never found any that stiff, more like 9-10GPa. It varies a lot in density too (not unusual), ~450kg/m^3 to ~540Kg/...
by Trevor Gore
Tue Dec 06, 2011 2:07 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Blackwood L-00 analysis
Replies: 10
Views: 12040

Re: Blackwood L-00 analysis

Hey Dom,

Did you get that USB mic.? How'd it go?
by Trevor Gore
Sun Dec 04, 2011 10:38 pm
Forum: The Gallery
Topic: "The Shed" guitar
Replies: 63
Views: 81435

Re: "The Shed" guitar

Thanks Paul. There's no wrong answers here. What you hear is what you hear! One of my early learnings was that there doesn't seem to be any such thing as "normal" hearing; another of the things that makes this game so hard (and so interesting...!)

Anyone else?
by Trevor Gore
Sun Dec 04, 2011 8:18 pm
Forum: The Gallery
Topic: "The Shed" guitar
Replies: 63
Views: 81435

Re: "The Shed" guitar

Thanks to Kim for the YouTube tips and thanks everyone who's had a go answering the question... Now here's a puzzle for you: The recordings were made with more-or-less identical settings; no EQ, no reverb, nuthin'. The guitars have soundboards that are as identical as two soundboards can get, same b...