Search found 109 matches

by Woodsy23
Wed Mar 25, 2015 10:28 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: First Gore Steel String - Resonances
Replies: 13
Views: 5743

First Gore Steel String - Resonances

Trevor, After completing my first acoustic guitar, a 12 string X-braced, I have now jumped in at the deep end and am attempting the falcate braced steel string with cutaway and live back from the plans in your book. The shape/dimensions are pretty close to your plans with just the upper bout and cut...
by Woodsy23
Wed Feb 25, 2015 12:40 pm
Forum: Instrument Builders Forum
Topic: Strings
Replies: 18
Views: 6694

Re: Strings

With the current exchange rate, Exilir nanoweb from Turramurra Music for $20 seems a good deal (free shipping if you buy 3 or more).
http://www.turramusic.com.au/pages/Cata ... ?CIID=1787
by Woodsy23
Tue Feb 03, 2015 12:14 pm
Forum: Instrument Builders Forum
Topic: after laminated plates for an ES-335 style buld
Replies: 8
Views: 3628

Re: after laminated plates for an ES-335 style buld

I built an ES355 in 2011 and obtained the plates, sides and other main pieces for the body from Ken McKay of Upnorthstrings http://www.upnorthstrings.com in Michigan USA. They were great quality and, as I understand, he obtains the maple and poplar ply from the same source as Gibson did. The bad new...
by Woodsy23
Sun Feb 01, 2015 9:24 am
Forum: Instrument Builders Forum
Topic: Problem gluing EI Rosewood
Replies: 18
Views: 5760

Re: Problem gluing EI Rosewood

I have new re-joined the back pieces. During the preparation of the edges to make them straight I definitely had to remove more material from the ends of the joint than in the middle so Trevor's and Peter's assessment seems spot on. I used new Titebond too. When initially preparing the edges, I reca...
by Woodsy23
Thu Jan 29, 2015 12:50 pm
Forum: Instrument Builders Forum
Topic: Problem gluing EI Rosewood
Replies: 18
Views: 5760

Re: Problem gluing EI Rosewood

Thanks Peter and Trevor for the additional advice. I will re-prepare the surfaces and ensure that I get a good fit before regluing with new glue. I carried out my non-scientific break test on the two samples I mentioned previously. Both broke along a grain line, not through the glue joint. The flesh...
by Woodsy23
Thu Jan 29, 2015 7:33 am
Forum: The Gallery
Topic: 10 String Lapsteel - New Yorker Style
Replies: 11
Views: 5263

Re: 10 String Lapsteel - New Yorker Style

Is it too late to see a picture of the bottle opener that was included?
Nice lap steel.
by Woodsy23
Wed Jan 28, 2015 11:20 pm
Forum: Instrument Builders Forum
Topic: Problem gluing EI Rosewood
Replies: 18
Views: 5760

Re: Problem gluing EI Rosewood

Woodsy Check out this post re Titebond glue and shelf life. http://www.anzlf.com/viewtopic.php?f=1&t=6405#p72311 From the information in that post, the Titebond I used was made in October 2012 - just over 2 years old. It may be getting a little old but I don't think that is the problem. Here are a ...
by Woodsy23
Wed Jan 28, 2015 5:41 pm
Forum: Instrument Builders Forum
Topic: Problem gluing EI Rosewood
Replies: 18
Views: 5760

Re: Problem gluing EI Rosewood

Starving the joint of glue may indeed be the problem. I used back to back wedges to apply pressure to the joint and squeezed it hard to get a close joint. I can do some trial joins with the off cuts, applying less pressure. Also, I think that while cleaning with acetone, I stopped while there was st...
by Woodsy23
Wed Jan 28, 2015 7:13 am
Forum: Instrument Builders Forum
Topic: Problem gluing EI Rosewood
Replies: 18
Views: 5760

Problem gluing EI Rosewood

I am building a Trevor Gore falcate steel string as my second acoustic build and encountered a problem with the glue joint in the East Indian Rosewood back plate. I joined the two halves using Titebond original and completed the final thicknessing to 2.2mm then cut out the shape. While I was sanding...
by Woodsy23
Fri Jan 16, 2015 6:46 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Stiffness measurement of the top
Replies: 14
Views: 7262

Re: Stiffness measurement of the top

Trevor, Ok. I understand now. So if the conventional classicals have a typical monopole mobility of ~ 20x10^-3 s/kg and a deflection of 0.2mm for a load of 1.2 kg = 12 N (I think you meant) or 11.7 N more accurately, the typical uncoupled top frequency would be 187 Hz. For your steel string, the typ...
by Woodsy23
Wed Jan 14, 2015 11:29 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Stiffness measurement of the top
Replies: 14
Views: 7262

Re: Stiffness measurement of the top

Trevor, I think I can work out the answer using equation 1.7-1 but I'm not sure what the typical uncoupled top frequency would be. From the table of test data in the link to Craig's post that you gave above, I see that the uncoupled top frequency for the Fletta classical guitars varies from 203 Hz t...
by Woodsy23
Mon Jan 12, 2015 12:26 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Stiffness measurement of the top
Replies: 14
Views: 7262

Re: Stiffness measurement of the top

Trevor,
I am also ineterested in the top stiffness you are getting with your guitars as I am attempting to build your falcate SS.

Are the deflection and load you quote above only typical for your Fleta type classical guitars? If so, what are the typical deflection and load for your falcate SS design?
by Woodsy23
Mon Dec 22, 2014 12:24 pm
Forum: Instrument Builders Forum
Topic: Bridge Pin reamer (3 Degree) - Where to buy cheap?
Replies: 11
Views: 5005

Re: Bridge Pin reamer (3 Degree) - Where to buy cheap?

I got a cheap hand held one from McJing in Sydney. You may be able to adapt one of these. Here's the link.
https://mcjing.com.au/categorybrowser.a ... oryid=1137
by Woodsy23
Mon Aug 11, 2014 1:32 pm
Forum: Instrument Builders Forum
Topic: Build thread - Blackwood & Bunya Dreadnought
Replies: 232
Views: 65573

Re: Build thread - Blackwood & Bunya Dreadnought

For cleaning "water stains" off blackwood after bending, I used Cabot's Deck Clean. It contains oxalic acid and is available is a smaller 1l container for around $12.65 at Bunnings. It worked pretty well on my blackwood sides. I did my first trial bends on some timber (silky oak I think) that was fl...
by Woodsy23
Mon Aug 04, 2014 1:40 pm
Forum: Instrument Builders Forum
Topic: What finish to use:
Replies: 4
Views: 1822

Re: What finish to use:

I have just completed my first acoustic build and I finished it using Liberon Finishing Oil, which I understand is a similar type of finish to Tru-oil and danish oil. I don't think it "filled up the sound board". I don't think it penetrates significantly more than other finishes but I am certainly n...
by Woodsy23
Mon Jul 21, 2014 10:41 pm
Forum: Instrument Builders Forum
Topic: Tips for a virgin electric builder.
Replies: 33
Views: 10999

Re: Tips for a virgin electirc builder.

A drawing I have of a Flying V shows the body thickness as 35mm. That is also the thickness of a Gibson SG so pickups will fit. You will need to get an L-shaped pickup selector switch to fit within that depth.
by Woodsy23
Mon Jul 21, 2014 1:33 pm
Forum: Instrument Builders Forum
Topic: Tips for a virgin electric builder.
Replies: 33
Views: 10999

Re: Tips for a virgin electirc builder.

My first electric guitar build was a through-neck made from Tasmanian Blackwood. With a through-neck, the timber pieces are smaller and could be obtained from a specialty timber supplier. You can also get nicely figured Blackwood which would suit an oil finish.

Good luck with your build.
by Woodsy23
Thu Jul 10, 2014 1:06 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Tap Test after Closing Box
Replies: 21
Views: 8847

Re: Tap Test after Closing Box

Trevor, I must be the slowest guitar builder around this forum. It has taken me since January to complete the guitar. However, the build seems to have worked out reasonably well. I previously wrote: With 394 gm of mass the T(1,1)2 is 179.0 Hz (181.5 Hz before thinning). With 202gm of mass it is 183....
by Woodsy23
Thu Mar 06, 2014 1:10 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Designing 12-string guitars and baritones
Replies: 18
Views: 9098

Re: Designing 12-string guitars and baritones

The string tension will be approximately doubled, so if the braces were 26% higher (cube root of 2 = approx. 1.26) that would take care of most of the strength issues. I think stiffness of the braces is proportional to cube of depth but strength (stresses in wood) is proportional to the square of t...
by Woodsy23
Mon Jan 27, 2014 7:25 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Tap Test after Closing Box
Replies: 21
Views: 8847

Re: Tap Test after Closing Box

OK. I have done some edge thinning this weekend and achieved pretty close to 2.5mm with the top sanded to remove all tool marks and grain tear out. I have repeated the tap tests with 394gm, 202gm and no side mass loading. Generally I'm getting a reduction of around 2.0 to 3.0 Hz as a result of the e...
by Woodsy23
Sun Jan 19, 2014 9:07 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Tap Test after Closing Box
Replies: 21
Views: 8847

Re: Tap Test after Closing Box

Hi Trevor, Today, I was able to make 4 steel blocks to mass load the sides and I have some more spectrum tests with two different masses. I first added 394 grams total (2 steel blocks each side) and obtained the following result. The T(1,1)2 is at 181.5 Hz, a drop of 7 Hz or 3.7%. Figure 2.3-13 woul...
by Woodsy23
Sat Jan 18, 2014 7:17 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Tap Test after Closing Box
Replies: 21
Views: 8847

Re: Tap Test after Closing Box

Trevor, OK. I'll do some more tests. My blackwood (690 kg/m3) bridge currently weighs in at 27g and after tapering the thickness at the back edge will probably get down to about 24 grams. I'm not sure I can easily get much lower with a 12 string bridge with a curved back edge (like in fig 20-3 of wh...
by Woodsy23
Sat Jan 18, 2014 6:32 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Tap Test after Closing Box
Replies: 21
Views: 8847

Re: Tap Test after Closing Box

In order to get a decent plot I needed to cover the disk side of my laptop with two pillows, turn off the fluorescent lights (which was a lot; I don't use incandescents unless I have to), and put my mike in the middle of a pile of pillows, with an open area pointing at the guitar. As you can see fr...
by Woodsy23
Sat Jan 18, 2014 4:57 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Tap Test after Closing Box
Replies: 21
Views: 8847

Re: Tap Test after Closing Box

Trevor, As suggested, I attached the almost complete bridge with double stick tape and retested. The bridge was complete except for tapering the thickness at the back edge so I figured that the mass of the wood not yet removed in the tapering would be about equivalent to the mass of the 12 bridge pi...
by Woodsy23
Thu Jan 16, 2014 9:31 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Tap Test after Closing Box
Replies: 21
Views: 8847

Re: Tap Test after Closing Box

Trevor, Your were completely correct. I hadn't checked the microphone input level. It was way too high. How stupid of me. I also had the microphone (a Shure SM58) sitting on the computer deck feeding in the computer fan vibrations. I guess if you're feeding the sound signal directly into VA only, wi...