Search found 109 matches

by Woodsy23
Sat May 28, 2016 10:18 am
Forum: Instrument Builders Forum
Topic: Bending New Guinea Rosewood
Replies: 8
Views: 3907

Re: Bending New Guinea Rosewood

I think the piece I was trying to bend is particularly difficult for some reason although the iron was probably not hot enough also. I bent a 2mm thick piece from a different NGR stock after a light spray with water and it was really easy to bend to a tight radius. Iron temperature was closer to 200...
by Woodsy23
Thu May 26, 2016 12:56 pm
Forum: Instrument Builders Forum
Topic: Bending New Guinea Rosewood
Replies: 8
Views: 3907

Re: Bending New Guinea Rosewood

I have only had time to check the temperature of my bending iron and to try a 1.8mm piece (from the same source) using a metal bending strap. That bent more easily, as expected, but still a bit of a struggle. I checked the temperature of the bending iron with another thermocouple thermometer and I a...
by Woodsy23
Fri May 20, 2016 7:52 am
Forum: Instrument Builders Forum
Topic: Bending New Guinea Rosewood
Replies: 8
Views: 3907

Re: Bending New Guinea Rosewood

Thanks everyone for your advice. I can check all suggested improvements. I have another piece of NGR from a different purchase which is a very different colour. I can check the temperature of the bending iron. I too have a home made one using a Chinese heater element and a controller but I do also (...
by Woodsy23
Thu May 19, 2016 7:52 am
Forum: Instrument Builders Forum
Topic: Bending New Guinea Rosewood
Replies: 8
Views: 3907

Bending New Guinea Rosewood

I attempted some trial bending of New Guinea Rosewood last night in preparation for building an F style mandolin. Using a bending iron, I found it quite difficult to bend. The gentler curves could be achieved eventually but I could not get the tight bends that would be required at the head, scroll a...
by Woodsy23
Thu Apr 07, 2016 12:48 pm
Forum: Instrument Builders Forum
Topic: parekh exports
Replies: 7
Views: 3071

Re: parekh exports

My experience with Stewmac is that they will send replacements for defective parts, no questions asked. Worth a try, even if the order was large.
by Woodsy23
Tue Mar 22, 2016 7:32 am
Forum: Instrument Builders Forum
Topic: 12 String SS Falcate braced guitar.
Replies: 4
Views: 2302

Re: 12 String SS Falcate braced guitar.

John,
I have sent you a PM about design of falcate bracing for a 12 string
by Woodsy23
Wed Mar 16, 2016 12:55 pm
Forum: Anything Goes
Topic: RIP Keith Emerson
Replies: 4
Views: 3485

Re: RIP Keith Emerson

So poor old Jon English doesn't rate a mention. RIP
by Woodsy23
Thu Mar 10, 2016 12:55 pm
Forum: The Gallery
Topic: Falcate Steel String in Maple
Replies: 7
Views: 3551

Re: Falcate Steel String in Maple

That is a fantastic job. Well done. I'm sure no one will find any flaws except for you.
by Woodsy23
Tue Mar 08, 2016 12:47 pm
Forum: Instrument Builders Forum
Topic: Rare Aria Pro 2 repair
Replies: 8
Views: 3833

Re: Rare Aria Pro 2 repair

I think that quite a few people use "filament tape" for gluing bindings. It's the tape with fibreglass fibres and readily available from Officeworks and ebay.
by Woodsy23
Sat Mar 05, 2016 8:15 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Determining target thickness with non-rectangular panels
Replies: 7
Views: 4787

Re: Determining target thickness with non-rectangular panels

How does it correlate to dynamic testing results? For the pieces that I did a twist test on, I couldn't get a good value for Glc from the dynamic tests because I was not getting the distinct peaks for the longitudinal and twist frequencies. I determined the Glc using FE analysis of the panel and ad...
by Woodsy23
Fri Mar 04, 2016 4:39 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Determining target thickness with non-rectangular panels
Replies: 7
Views: 4787

Re: Determining target thickness with non-rectangular panels

In my post above I said that I don't have a formula for the corner deflection of a rectangular panel as a function of the Glc. However, I have just realised that the deflection of the corner of a rectangular panel with the other three corners supported is equivalent to the twist of a "beam" with one...
by Woodsy23
Mon Feb 29, 2016 9:26 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Determining target thickness with non-rectangular panels
Replies: 7
Views: 4787

Re: Determining target thickness with non-rectangular panels

Provided the variation in width is not too great, a beam deflection test on the whole piece should give a reasonably accurate for El. You would base the calculation on the average width of the piece. That will be easier to judge if the two long edges can be made straight - it would be the width half...
by Woodsy23
Sat Feb 20, 2016 10:16 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

I'd like to verify some things regarding the units that are input into the formulas. deflection = mm .266 in my case Load = newtons 12.106 using 1235 gms Freq = hz 151.4 (plugged Top) The monopole mobility you calculated from these numbers is correct, by my spreadsheet. In my case this came out to ...
by Woodsy23
Thu Feb 18, 2016 1:31 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Binding with Carbon Fiber?
Replies: 3
Views: 2250

Re: Binding with Carbon Fiber?

"Carbon fiber (CF) "strands", which consists of thousands of CF strands of about 7 microns diameter, only has stiffness (high elastic modulus) in tension in its longitudinal direction. When formed into a laminate by embedding the fibres in an epoxy matrix, the stiffness of the laminate parallel with...
by Woodsy23
Tue Feb 16, 2016 12:45 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Brace dimensions for live backs
Replies: 10
Views: 5737

Re: Brace dimensions for live backs

I've been trying a different type of scallop that is a bit easier to adjust and it seems to work OK. I just file a notch in the centre of the lower back brace using a piece of aluminium tube about 140mm long by 65mm diameter with coarse sand paper on one side and fine on the other. I file a starter...
by Woodsy23
Wed Feb 03, 2016 1:04 pm
Forum: Instrument Builders Forum
Topic: Buildng Advice for a Telecaster neck
Replies: 12
Views: 5163

Re: Buildng Advice for a Telecaster neck

If you don't think book-matched halves will look good in the peghead (there is no veneer to cover) then you could consider a contrasting stripe between the two halves - sort of like a full length "skunk stripe", possibly in walnut.
by Woodsy23
Wed Jan 20, 2016 12:57 pm
Forum: The Gallery
Topic: 1st SS Build Florentine Cutaway
Replies: 9
Views: 5087

Re: 1st SS Build Florentine Cutaway

That's a great looking guitar. Congratulations. I'm really impressed with what you took on as a first build. What's that saying? "bite off more than you can chew and chew like hell". the 1st was nitro cellulose and had some 'blooms' that I attributed to a lack of filter in the air line during sprayi...
by Woodsy23
Tue Dec 22, 2015 1:03 pm
Forum: Instrument Builders Forum
Topic: Four Flute Router Cutter
Replies: 17
Views: 7244

Re: Four Flute Router Cutter

I bought a few router bits from MLCS in the USA (when the Aussie Dollar was better), including a 2" long double bearing flush trim bit from their premium "Katana" range. It is only 2 flute but is really good quality. See link http://www.mlcswoodworking.com/shopsite_sc/store/html/smarthtml/pages/kata...
by Woodsy23
Fri Dec 11, 2015 1:24 pm
Forum: The Gallery
Topic: Small body (Neo) SS, with a touch of deco
Replies: 9
Views: 4811

Re: Small body (Neo) SS, with a touch of deco

Beautiful work Trevor, as usual.

Do you think your 14 fret falcate braced SS sound as good / loud / responsive as a similar 12 fret?
by Woodsy23
Tue Dec 08, 2015 1:00 pm
Forum: The Gallery
Topic: Otway Blackwood and Spruce dreadnought
Replies: 6
Views: 3455

Re: Otway Blackwood and Spruce dreadnought

A very impressive result. I particularly like the "rosette". I haven't seen one like that before.

How do you like the sound?
by Woodsy23
Mon Nov 30, 2015 1:17 pm
Forum: Instrument Builders Forum
Topic: Falcate Braced Classical (No 13)
Replies: 9
Views: 2679

Re: Falcate Braced Classical (No 13)

Martin, I'm interested in the approach you're adopting for your compensation spreadsheet. A while ago there was a discussion in a thread about getting the spreadsheet to determine the optimum nut and saddle compensation for each string. That was way beyond me so I decided to adopt the simpler approa...
by Woodsy23
Wed Nov 04, 2015 12:48 pm
Forum: Instrument Builders Forum
Topic: Current Build - Falcate Braced Multiscale OM cutaway
Replies: 217
Views: 87220

Re: Current Build - Falcate Braced Multiscale OM cutaway

Great looking guitar.
Like others, I love the rosette particularly. I cut some burl pieces recently to make a rosette. I think I'll do one similar to yours.
Keep the posts coming.
by Woodsy23
Thu Oct 29, 2015 9:14 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Cross-grain tap test advice?
Replies: 29
Views: 12109

Re: Cross-grain tap test advice?

James, After checking the Black book, I see that my advice was slightly in error. For measuring cross grain frequency the position along the board to hold is not half way but, as shown in Trevor's Fig 4.5-3, its about 3/10 along the board. My figure of 23% was close. It's 22.4%, as shown in Fig 1.6-...
by Woodsy23
Thu Oct 29, 2015 1:04 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Cross-grain tap test advice?
Replies: 29
Views: 12109

Re: Cross-grain tap test advice?

James, I was going to look at the books last night but forgot. My recollection is that the location to hold the board (the node) is a point at about 23% of the length from the end, for the longitudinal stiffness, and 23% of the width from the side for the cross stiffness. These are the points in the...
by Woodsy23
Wed Oct 28, 2015 1:25 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Cross-grain tap test advice?
Replies: 29
Views: 12109

Re: Cross-grain tap test advice?

James,

I haven't got the books with me at the moment so I can't check but my recollection is that the point where you hold the board to generate the cross grain vibration is further from the edge of the board than indicated by your marks. I may be wrong but it's worth checking the books.