Search found 195 matches
- Wed Jan 14, 2015 12:02 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Tape on the back for testing
- Replies: 5
- Views: 7315
Re: Tape on the back for testing
Thanks for the uncrossing the wires! I'll let you know how it goes.
- Tue Jan 13, 2015 12:22 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Tape on the back for testing
- Replies: 5
- Views: 7315
Re: Tape on the back for testing
Compared to removing a glued on back for adjustments, I don't think the time issue will be significant for you! You must be better at it than I. My backs are laminated and the hot knife tends to wonder into the first laminate (mahogany) and splits the laminate in places. Makes more a mess of it tha...
- Sun Jan 11, 2015 10:04 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Tape on the back for testing
- Replies: 5
- Views: 7315
Tape on the back for testing
In a recent thread, Jeff (jeffhigh) mentioned: "I could do like Brian Burns and tape the back on, glue on the bridge, test and modify." Does that actually work? Is the connection to the sides solid enough with tape to get a reliable test of the closed box? I glue my tops to the sides first so I can ...
- Wed Dec 10, 2014 6:25 am
- Forum: Instrument Builders Forum
- Topic: New Luthier Tips du Jour video - Accelerating break in
- Replies: 27
- Views: 29001
Re: New Luthier Tips du Jour video - Accelerating break in
Speaking of breaking in guitars, opening up, etc. and numbers & FRC, has anyone done such a study for instruments that have been played in naturally? Since I've started keeping deflection and FRC plots I've looked at maybe three of my guitars and one of a another builder, a couple years after they w...
- Wed Nov 26, 2014 6:20 am
- Forum: Instrument Builders Forum
- Topic: Controlling humidity on a budget
- Replies: 5
- Views: 7270
Re: Controlling humidity on a budget
For what it's worth, I use a cheap dehumidifier in the summer and a misting humidfier in the winter. I have a gauge in the shop and control the humidity devices manually. I probably have $150 US invested in the humidifier, dehumidifier and gauge. My shop is ~ 300 sq. ft, heated by base board electri...
- Sat Nov 15, 2014 9:45 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Simulating stiffer back, closed box
- Replies: 10
- Views: 11770
Re: Simulating stiffer back, closed box
A number of the French vintage gypsy guitars had soft backs, molded (laminated) to a dish or violin back shape, some with only one or no braces at all. Soft being a back with B(1,1) lower than T(1,1)2. Deflection under a 1kg load can be over 0.30mm! The result is usually light weight, high volume, q...
- Sat Nov 15, 2014 11:50 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Simulating stiffer back, closed box
- Replies: 10
- Views: 11770
Re: Simulating stiffer back, closed box
Right, I had a 7x18mm ladder brace at the max width of the lower bout already. Molded archtop like backs with a single brace were used on some vintage French gypsy guitars. This was my first go at it and I misjudged the stiffness. I thought the shape would lend more stiffness, but it was less than I...
- Sat Nov 15, 2014 12:48 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Simulating stiffer back, closed box
- Replies: 10
- Views: 11770
Re: Simulating stiffer back, closed box
Here's what I ended up doing. Epoxy filled the back until the grain was fully filled and smooth. Then glued a couple pieces of scrape 4mm cedar top material to the back with five minute epoxy. The laminated back is the first I've made with an violin back shape. I thought with the shape and one brace...
- Thu Nov 13, 2014 7:13 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Simulating stiffer back, closed box
- Replies: 10
- Views: 11770
Re: Simulating stiffer back, closed box
Would holding the box down on a solid surface with some padding take the back out of the picture? I know not ideal but not hard to do. It might, holding the guitar tight to the body does deaden the back some, but I don't want to take the back out of the picture, I want it in the picture, only stiff...
- Thu Nov 13, 2014 12:49 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Simulating stiffer back, closed box
- Replies: 10
- Views: 11770
Re: Simulating stiffer back, closed box
For simulation purposes, with an unfinished guitar you can glue braces on the outside and shave and trim at will, then remove all traces and finish the guitar. That what I've been thinking too. My backs are laminated with 0.5mm veneers so I have to be a little careful, no room for glue staining, bu...
- Wed Nov 12, 2014 9:24 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Identifying a peak
- Replies: 5
- Views: 7736
Re: Identifying a peak
Just did the obvious test of setting the Bradley to 200.00 hz and using VA to read it, exactly the same, so it must be my technique. Thanks,
- Wed Nov 12, 2014 8:31 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Identifying a peak
- Replies: 5
- Views: 7736
Re: Identifying a peak
Thanks for the reply. Yes, I think a long dipole on the back in this range is a possibility. Before I wrote the OP, I ran a Chladni on the back around 245hz and got a rather weak long dipole. The back has three ladder braces, so a weak dipole is not so surprising I guess. This was before your reply ...
- Tue Nov 11, 2014 7:17 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Identifying a peak
- Replies: 5
- Views: 7736
Re: Identifying a peak
Another thought, if this peak at 244hz is a monopole of some sort, I guess I would have expected the frequency of this peak at 244hz to have risen with the removal of bridge mass (~ 11gr), but this did not happen like it does with T(1,1)2 This lack of change seems to reinforce the idea that 244hz is...
- Tue Nov 11, 2014 6:13 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Identifying a peak
- Replies: 5
- Views: 7736
Identifying a peak
I wonder if anyone can help me identify the peak at 244hz. Here is a screen shot of the FRC in VA for taps the coupled top, fully strung. It's a good sounding guitar, so worth figuring out. FRC.jpg At 203hz is the T(1,1)2 and at 226hz is what I'm pretty sure is the back. IMG_4062 (Copy).JPG IMG_4065...
- Tue Nov 11, 2014 12:53 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Simulating stiffer back, closed box
- Replies: 10
- Views: 11770
Simulating stiffer back, closed box
Any thoughts on simulating a stiffer back on a closed box? Adding mass simulates less stiffness, but what about stiffer? My case is complicated by a soundhole which is too small to get a hand through, so it is unlikely that I can make a permanent change to the guitar but I wonder if there are non-de...
- Tue Oct 28, 2014 1:16 am
- Forum: Health and Safety
- Topic: Hot glue from the Hot Glue gun
- Replies: 7
- Views: 27474
Re: Hot glue from the Hot Glue gun
I worked in a small furniture factory in my youth and one of my jobs was spraying lacquer. One day, the gun kept plugging up and the foreman said "let me take a look at it". He loaded the gun with lacquer thinner, looked right at the nozzle and pulled the trigger. On the way to the hospital, he told...
- Tue Oct 21, 2014 10:50 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Trevor's course
- Replies: 7
- Views: 10195
Re: Trevor's course
Just wondering, does Trevor ever come to the US and give such a course? I think he (you) have in the past, wonder if anything is on the horizon for the future.
- Wed Oct 15, 2014 11:03 pm
- Forum: Instrument Builders Forum
- Topic: Bending Brazilian Lacewood sides
- Replies: 11
- Views: 12784
Re: Bending Brazilian Lacewood sides
I'll second the SuperSoft II idea. It is the only way I've been able to bend 2mm thick curly maple bindings in the tight cutaway radii without breaking them. The grain of the curly maple I was using ran from one side to the other in less than 10mm. I have since used SuperSoft II on rosewood veneers ...
- Wed Oct 08, 2014 2:26 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Clarity
- Replies: 2
- Views: 4681
Re: Clarity
Thanks Trevor. I reread the sections on tonal characteristics including Attack and Separation. Yeah, there is a lot there that applies. Your comments about the nature of the Selmac is right on. Lots to think about.
- Fri Oct 03, 2014 12:42 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Clarity
- Replies: 2
- Views: 4681
Clarity
Clarity is an attribute I value in an acoustic jazz guitar, especially when being driven hard & fast with a pic, especially in the chords. Anyone have thoughts on what the handles are on this, particularly in the lower register, say below 300-400hz.
- Wed Apr 30, 2014 11:50 pm
- Forum: Instrument Builders Forum
- Topic: Implications of socketing braces
- Replies: 15
- Views: 14566
Re: Implications of socketing braces
Thanks for you ideas guys. I too have seen brace ends coming through the sides on some vintage guitars. My take on this is when in a dry environment, the grain of the top and the brace are 90 degrees opposed. As wood shrinks more across the grain than with the grain, if dried out, the top plate shri...
- Wed Apr 30, 2014 1:22 am
- Forum: Instrument Builders Forum
- Topic: Implications of socketing braces
- Replies: 15
- Views: 14566
Implications of socketing braces
I'm wondering about the implications of socketing brace ends in the linings. In all the good examples of the kind of guitar I build, the bracing scheme is ladder bracing with any where from three to five braces. The ends are always socketed. In other guitar styles, many of the braces are not. What h...
- Tue Apr 15, 2014 4:18 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Fretting about fretting
- Replies: 5
- Views: 7119
Re: Fretting about fretting
For better or worse, I do not glue the frets during installation for the same reasons you mention. I shoot some CA down the slot from both ends after I have dressed the fret ends. I press my frets because I feel it gives a much more accurate set, but I know my little bench drill less is not up to jo...
- Fri Apr 11, 2014 6:26 am
- Forum: Instrument Builders Forum
- Topic: What glue bonds best to Titebond?
- Replies: 6
- Views: 7238
Re: What glue bonds best to Titebond?
Ha, ha, that's funny as that is what I've done in the past, heat it up and reclamp it. I subsequently read how that "doesn't work" and believed it instead of trusting my own experience. Lesson learned.....again Thanks for all the ideas.
- Wed Apr 09, 2014 10:23 pm
- Forum: Instrument Builders Forum
- Topic: What glue bonds best to Titebond?
- Replies: 6
- Views: 7238
Re: What glue bonds best to Titebond?
Thanks for the reply. Timber, but not removed, just a thin gap about an inch long, so cleaning the joint well was not possible. I ended up using a very thin knife blade to do what I could, warmed it up enough to be flexible, filled the gap with thin CA and clamped and let set for an hour. Seems to b...