Search found 1610 matches
- Sat May 27, 2023 10:53 am
- Forum: Instrument Builders Forum
- Topic: Chladni and VA tests ???
- Replies: 61
- Views: 81082
Re: Chladni and VA tests ???
Generally, you have to excite where you expect an antinode to be, which helps reduce the power requirement. Google up some pictures of Chladni patterns and that will give you an idea of where those are. There are pics in the book, too, of course. The monopole at at 356 Hz is unusual. I suspect you a...
- Sat Apr 22, 2023 1:52 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: eBook edition?
- Replies: 16
- Views: 35906
Re: eBook edition?
Unfortunately, my crystal ball is no better than Philip Lowe's.
- Sun Apr 16, 2023 10:54 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: eBook edition?
- Replies: 16
- Views: 35906
- Fri Mar 17, 2023 8:56 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Win 10 +usb mic
- Replies: 6
- Views: 13734
Re: Win 10 +usb mic
Good to hear!
File Explorer:
Keyboard shortcut is Windows key + e
or the long way is Start (Programs list)/ Windows System/File Explorer (then drop a shortcut onto your task bar)
File Explorer:
Keyboard shortcut is Windows key + e
or the long way is Start (Programs list)/ Windows System/File Explorer (then drop a shortcut onto your task bar)
- Thu Mar 16, 2023 8:36 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Win 10 +usb mic
- Replies: 6
- Views: 13734
Re: Win 10 +usb mic
Once you get behind the Win 10 GUI, you'll find that things look a lot like Win 7.
- Wed Mar 15, 2023 9:28 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Win 10 +usb mic
- Replies: 6
- Views: 13734
Re: Win 10 +usb mic
I have an Audio-Technica ATR 2100-USB mic which works fine on Win 10 and Win 7, plugging straight into the computer. This mic can be connected as either an XLR dynamic mic or as a USB mic and works fine with either connection (mic socket or USB). The problem is likely with Win 10 not recognising the...
- Thu Feb 23, 2023 8:13 am
- Forum: Instrument Builders Forum
- Topic: Repairers in Darwin
- Replies: 5
- Views: 3732
Re: Repairers in Darwin
You could try Jim Scofield, Darwin Strings and see if he is interested. Jim has been a frequent contributor to the forum.
- Tue Feb 14, 2023 8:08 am
- Forum: Instrument Builders Forum
- Topic: Action & relief for C# open setup
- Replies: 6
- Views: 7516
Re: Action & relief for C# open setup
The amplitude of oscillation is entirely dependent on the pluck displacement. Of course, it takes less force to displace a lower tension string for the same oscillation amplitude of a higher tension string. For the same feel you have to go to a higher tension string set, i.e. heavier strings, which ...
- Mon Jan 16, 2023 7:32 pm
- Forum: Instrument Builders Forum
- Topic: Heelless neck joint
- Replies: 8
- Views: 9040
Re: Heelless neck joint
Not my idea, and no pictures, but you could do a tapered sliding dovetail into what I call the neck block top plate, with a single screw accessible from inside to stop it unplugging. Fully fit the dovetail before you glue the fret board on.
- Mon Jan 16, 2023 8:43 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Vibrational stiffness freq for ukulele?
- Replies: 4
- Views: 11587
Re: Vibrational stiffness freq for ukulele?
You might find some relevant information in this thread. Otherwise, try to track down Clancy.
- Wed Dec 07, 2022 8:25 pm
- Forum: Instrument Builders Forum
- Topic: Frets causing back bow
- Replies: 8
- Views: 12873
Re: Frets causing back bow
My fret saw is 0.5mm, my fret tangs are 0.5mm wide so why when I install the Frets do I get a back bow on my fretboard I wonder? I'm guessing that the 0.5mm measurement doesn't include the barbs (or the frets would just fall out). The barbs will force a bit of back bow, especially if you're frettin...
- Sun Oct 16, 2022 11:34 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Top thicknesses :)
- Replies: 6
- Views: 14094
Re: Top thicknesses :)
The deflection method will also not work on those. Is there any way to still use them? It's still possible to use the deflection method if the cupping is not too bad. Basically, pre-load the panel with enough weight to flatten the cupping, zero the deflection gauge, then add more weights to take th...
- Sat Oct 15, 2022 11:04 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Top thicknesses :)
- Replies: 6
- Views: 14094
Re: Top thicknesses :)
At the moment my guess is there was some problem with the tap testing. Some of those tops were slightly bent in the short axis (cross grain) while being totally straight in the long grain direction. That would explain things. Cupping across the grain will make the long grain Young's modulus measure...
- Thu Oct 13, 2022 7:18 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Live back too low when uncoupled
- Replies: 8
- Views: 12550
Re: Live back too low when uncoupled
Gluing fiber carbon over a X-Brace to increase stiffness would be an option? I don’t know if anyone tried before. See page 11-12 in the Build book. What is the consequences of having the main frequency too low? "Low" is a matter of taste. The lower you take the main resonances, the more bass you ge...
- Tue Oct 11, 2022 9:25 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Live back too low when uncoupled
- Replies: 8
- Views: 12550
Re: Live back too low when uncoupled
If the back has the radial bracing plus main brace over lower bout then you have the option of reducing stiffness of the back by taking material out of the centre of the back brace. That's correct, but reducing the stiffness will reduce the T(1,1) 3 frequency. The OP wants to raise it. To raise sti...
- Tue Oct 11, 2022 9:11 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Curious about a mode at 146-ish Hz
- Replies: 11
- Views: 17621
Re: Curious about a mode at 146-ish Hz
That's an interesting mode, Jim! All I can think of is that it might be a "corpus" mode, and maybe asymmetrical because of the offset excitation. The first corpus mode is the marimba bar mode of the whole guitar. It has a node usually somewhere between the nut and first fret with the other node bein...
- Tue Oct 11, 2022 8:57 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Top thicknesses :)
- Replies: 6
- Views: 14094
Re: Top thicknesses :)
Jurgen, I put your numbers through my spreadsheet and got 3.15mm for the Sitka (twice) and 3.22mm for the Engelmann. So I suspect you may have got the data entry wrong on the Sitka, unless the data you posted is your actual spreadsheet, in which case something really weird is happening. As for alway...
- Tue Sep 27, 2022 8:53 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Tap testing the panels - help, what am I seeing?
- Replies: 2
- Views: 9871
Re: Tap testing the panels - help, what am I seeing?
The cross grain mode is definitely the most difficult to get. However, the thickness result does not depend very heavily on it, which I guess is the good news! I hold the panel about a third of the way down the long edge and tap at the same level down with the mic immediately behind the tap position...
- Sat Sep 10, 2022 8:44 am
- Forum: Instrument Builders Forum
- Topic: Running VA software with Windows 11
- Replies: 3
- Views: 2767
Re: Running VA software with Windows 11
VA will run on anything from Win XP to Win 11. I still use v. 9.0.6, which has a couple of draw-backs listed here , but these are less hassle (to me) than using later versions. After XP, for v. 9.0.6 the mic levels need to be set up in Windows, as after XP the Windows I/O protocol changed which is t...
- Wed Sep 07, 2022 10:39 pm
- Forum: Instrument Builders Forum
- Topic: The Caldersmith Papers
- Replies: 6
- Views: 21258
Re: The Caldersmith Papers
I understand that Graham Mc. had some difficulties obtaining permission to publish a number of papers jointly authored by Graham C. and Tom Rossing. Prof. Thomas Rossing was one of the greats of musical acoustics and a friend to many, including me. It is with considerable sadness that I have to repo...
- Tue Aug 23, 2022 8:37 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Wood species for Falcate braces
- Replies: 37
- Views: 64599
Re: Wood species for Falcate braces
I recently bent some Engelmann spruce into falcate braces - by far the easiest spruce I've ever bent. That was the first time I've tried bending Engelmann, so I don't know if that is representative of the species. What's the general experience of bending Engelmann by you falcaters out there?? Thanks.
- Tue Aug 02, 2022 8:30 am
- Forum: Instrument Builders Forum
- Topic: Epoxy, brushes, CF tow, oh my!
- Replies: 10
- Views: 6607
Re: Epoxy, brushes, CF tow, oh my!
It's best not to buy tow, but to buy cloth and pull threads from the cloth. The cloth spec. is in the book. I get mine from these guys: https://allnex-brookvale.business.site/ . I use artist brushes from Bunnies or try a $2 shop. Use WEST epoxy, 105 resin and 207 hardener (the 207 can be used when g...
- Sat Jul 30, 2022 11:00 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: DIY Sig Gen/Amp unit for Chladni patterns
- Replies: 33
- Views: 150713
Re: DIY Sig Gen/Amp unit for Chladni patterns
- Thu Jul 28, 2022 7:59 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: DIY Sig Gen/Amp unit for Chladni patterns
- Replies: 33
- Views: 150713
Re: DIY Sig Gen/Amp unit for Chladni patterns
On the note of people blowing their speakers I was wondering if you think this Griffin signal generator with amplifier will work? Hard to say, Dave. The specs just say sig gen and amplifier. A bit like saying car with engine. See if you can get more detail out of Griffin, such as frequency range an...
- Wed May 11, 2022 8:23 am
- Forum: The Gallery
- Topic: Figured Koa Acoustic
- Replies: 7
- Views: 12680
Re: Figured Koa Acoustic
Nice work! Definitely one for "The Book" gallery!
The guy who inspired your rosette was "Tricky Fish".
The guy who inspired your rosette was "Tricky Fish".