Search found 1610 matches
- Tue Apr 26, 2022 8:25 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Un-coupled top frequency
- Replies: 2
- Views: 11490
Re: Un-coupled top frequency
Hello, I'm determining the monopole mobility of a just finished steel string. I need to find the UN-coupled tops main frequency. The strings are off, and the sound hole is plugged with a cut off sour cream container. When I tap it into the analyzer with no saddle or bridge pins I get 188hz. With a ...
- Fri Apr 01, 2022 8:29 am
- Forum: Instrument Builders Forum
- Topic: Applying G&G techniques to a kit guitar
- Replies: 14
- Views: 9331
Re: Applying G&G techniques to a kit guitar
The main reason for routing the saddle slot after gluing down the bridge is because the bridge is pre-positioned by the bridge pin holes on falcate braced designs, as there is little latitude for error due to the proximity of braces if the pin holes are drilled in the closed box. If you have the rig...
- Fri Mar 11, 2022 8:21 am
- Forum: Instrument Builders Forum
- Topic: 0 Taper Bridge Pins
- Replies: 19
- Views: 13953
Re: 0 Taper Bridge Pins
They also have no taper at all, the shaft measures 4.7mm the whole length. As such, neither my 4.5mm or 5mm drill bits are suitable... 4.7mm is 3/16". You should have no trouble finding a 3/16" drill if you want to use the supplied pins. A 3/16" drill is also a good size to use as a pilot hole for ...
- Wed Mar 02, 2022 3:13 pm
- Forum: Instrument Builders Forum
- Topic: Saddle Compensation
- Replies: 10
- Views: 6333
Re: Saddle Compensation
Hi Trevor, thanks for the response mate, You will note that I simply excluded the 3mm for nut compensation in my calculation, does that now make my numbers correct? Definitely not! Adding nut compensation, in very approximate terms, halves the amount of saddle compensation you need. So just excludi...
- Wed Mar 02, 2022 9:15 am
- Forum: Instrument Builders Forum
- Topic: Saddle Compensation
- Replies: 10
- Views: 6333
Re: Saddle Compensation
Steel string, Falcate braced, 645.2mm Scale Length, no Nut Compensation. I have read and re-read sections pertaining to Saddle Compensation and I am terribly confused about Saddle Location. If I use a 5mm Saddle, straight not slanted, the front of the saddle slot should be (from page 20-19, section...
- Fri Jan 21, 2022 7:56 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Intonation Problem
- Replies: 10
- Views: 18137
Re: Intonation Problem
I've not applied any more thought to this (a bit busy at the moment), but have you got some sort of tail piece resonance going on?
- Sun Jan 16, 2022 11:06 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Intonation Problem
- Replies: 10
- Views: 18137
Re: Intonation Problem
Check out that peak at ~440Hz. That's likely your problem...
In the 2nd Edition, Section 22.3.4 shows an example of how to fix this sort of problem on the 2nd partial (not in the 1st Edition). Also likley in the Modal Tuning Course notes.
In the 2nd Edition, Section 22.3.4 shows an example of how to fix this sort of problem on the 2nd partial (not in the 1st Edition). Also likley in the Modal Tuning Course notes.
- Fri Nov 26, 2021 8:16 am
- Forum: Instrument Builders Forum
- Topic: Schertier Slot Head Tuners
- Replies: 5
- Views: 5154
Re: Schertier Slot Head Tuners
I haven't used them either, but I would drill full depth at 6mm then open out for the collar with a metric step drill that has (at least) 6, 8 and 10mm steps. Picking up the original 6mm bore with the 6mm step should keep everything concentric. Best done with a pillar drill to keep the bores square ...
- Thu Nov 25, 2021 8:33 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Air, Top and Back Resonances, Coupled and Uncoupled - Untensioned?
- Replies: 17
- Views: 82831
- Fri Nov 12, 2021 8:52 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Target Plate Thickness for 0/Parlor Guitars
- Replies: 7
- Views: 20570
Re: Target Plate Thickness for 0/Parlor Guitars
I measured 9 top plates today and calculated targeted thicknesses for 343 mm wide 0 guitars. Adirondack, Engelmann, Lutz and Sitka. I look a random 10% stiffness reduction considering the top width. If you're using the formulae in the books for the elastic constants, measuring them correctly and ap...
- Thu Aug 05, 2021 7:07 pm
- Forum: Instrument Builders Forum
- Topic: West systems GFlex or Titebond original
- Replies: 2
- Views: 3439
Re: West systems GFlex or Titebond original
If you're looking for a gap filling glue, avoid Titebond. The thinner the Titebond glue line, the stronger it is. I would also avoid liquid epoxies, which is what G/Flex appears to be. You need the glue to stay where you put it. So I would suggest using Techniqlue (an epoxy), which is thixotropic, s...
- Sun Aug 01, 2021 11:37 am
- Forum: Instrument Builders Forum
- Topic: Torrefied Tonewood
- Replies: 24
- Views: 56829
Re: Torrefied Tonewood
No, I haven't done any objective tests.
- Fri Jul 09, 2021 12:31 pm
- Forum: Instrument Builders Forum
- Topic: How do you profile your bridge?
- Replies: 10
- Views: 7619
Re: How do you profile your bridge?
Page 20-8 in the Build book. Make a convex sanding form by either laminating veneers into the top dish that you used (then dress any spring-back by sanding in the dish) or just sand a block from scratch in the dish. I start with 80 grit and it never takes very long (no more than 5 minutes total) to ...
- Fri Jul 09, 2021 9:40 am
- Forum: Instrument Builders Forum
- Topic: New Gore Guitars website
- Replies: 7
- Views: 5591
Re: New Gore Guitars website
The UK is quite a low proportion of sales, which was a bit surprising as I know there is a lot of interest there. I think VAT and import duties really loaded up the price. The USA is a big market (no import tax/duties) and also Canada, which does have import taxes. There has been good interest acros...
- Wed Jul 07, 2021 7:56 am
- Forum: Instrument Builders Forum
- Topic: Falcate Bridge Plate Thickness
- Replies: 6
- Views: 4681
Re: Falcate Bridge Plate Thickness
1.5mm as per the second edition. Apologies for the typo that got through in the 1st edition.
- Thu Jul 01, 2021 9:12 pm
- Forum: Instrument Builders Forum
- Topic: New Gore Guitars website
- Replies: 7
- Views: 5591
New Gore Guitars website
When you've had a website up and running for a dozen or so years it can get quite big. I hadn't realised how much stuff I had there until I got a message from my hosting service saying they were going to switch off the content editor. That was about 6 months ago, so my website has been frozen in tim...
- Sat May 08, 2021 5:39 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Confused about frequency response in my first TG style falcate
- Replies: 20
- Views: 25700
Re: Confused about frequency response in my first TG style falcate
Nice guitar, Martin. Regarding the changing frequency responses, your early responses without the neck mean you couldn't have had strings on, and you may not have had saddle and bridge pins in. Just adding the mass of the strings can make quite a difference which people often put down to loading the...
- Tue Apr 27, 2021 9:55 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Bolt On Neck truss Rod
- Replies: 3
- Views: 5988
Re: Bolt On Neck truss Rod
I haven't found much info in the book regarding truss rod extension pocket for BO. :o !! Section 18.9.1 I wonder about where to place the adjuster nut Fig 18-7 Also when the fingerboard is finally glued down, how to stop glue entering the rod channel. Section 18.6, esp. 2 lines up from the bottom o...
- Tue Apr 20, 2021 1:02 pm
- Forum: Instrument Builders Forum
- Topic: detached bridge
- Replies: 5
- Views: 5018
Re: detached bridge
This may not be the only problem, but certainly looks like one of them... Looking at the thickness of the residual glue on the tail side of the detached bridge, that glue line looks way too thick, to the extent that the the joint looks like it wasn't properly closed. There could be numerous reasons ...
- Sat Apr 17, 2021 10:18 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: How useful is the CF under the brace?
- Replies: 15
- Views: 47826
Re: How useful is the CF under the brace?
I think you need to re-check the theory of composite structures... Hint: the CF is held in a matrix...
- Fri Apr 16, 2021 10:08 am
- Forum: Instrument Builders Forum
- Topic: Falcate Classical #2 Build (in NZ)
- Replies: 37
- Views: 26576
- Fri Apr 16, 2021 9:57 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: How useful is the CF under the brace?
- Replies: 15
- Views: 47826
Re: How useful is the CF under the brace?
One of the main reasons for adding CF to the structure is to control cold creep, so it allows you to remove a lot of wood that would otherwise have to be there purely to keep the stress levels down so there is less cold creep. Over time, as wood creeps, only having one layer of CF will likely come b...
- Fri Apr 16, 2021 9:31 am
- Forum: Instrument Builders Forum
- Topic: Problem with side mass not changing T1
- Replies: 2
- Views: 3099
Re: Problem with side mass not changing T1
Moving down 17Hz would take an awful lot of side mass. The critical thing for making side mass work is to make sure the mass is so firmly connected that it is essentially integral to the sides, because to work the mass has to move precisely with the sides. So if the hold-down bolts aren't seriously ...
- Fri Apr 16, 2021 9:17 am
- Forum: Instrument Builders Forum
- Topic: Paulownia Acoustic Top
- Replies: 10
- Views: 8697
Re: Paulownia Acoustic Top
Paulownia has a similar range in long grain Young's modulus as King Billy, but typically is around 75% the density. As ever, it's critical to measure the piece of wood you are about to build with, but I can't see why Equ. 4.5-7 wouldn't work to tell you how thick to leave it.
- Sun Apr 11, 2021 9:51 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Specific mobility
- Replies: 3
- Views: 5893
Re: Specific mobility
The book says "Steel string guitars with monopole mobility greater than 14 x 10^-3 s/Kg are exceptional instruments indeed...." (p. 1-89) Note that in Fig 1.7-8 the guitars below 14 are all wood X-braced guitars and the one above 18 is falcate braced with CF. That tells you something about responsiv...