If history is anything to go by, whiskey and wine!
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- Wed Apr 24, 2024 4:42 pm
- Forum: Instrument Builders Forum
- Topic: Re: Modal Tuning Course, Melbourne Notice - Rescheduled
- Replies: 8
- Views: 17004
Re: Modal Tuning Course, Melbourne Notice - Rescheduled
- Wed Apr 24, 2024 12:36 pm
- Forum: Instrument Builders Forum
- Topic: Re: Modal Tuning Course, Melbourne Notice - Rescheduled
- Replies: 8
- Views: 17004
Re: Modal Tuning Course, Melbourne Notice - Rescheduled
I have nothing more scheduled for Melbourne this year, but there may be a course in Sydney, but dates etc. are yet to be decided. The next scheduled courses are in October at Robbie O'Brien's place (Colorado), if your travels take you in that direction.
- Tue Apr 23, 2024 8:29 am
- Forum: Instrument Builders Forum
- Topic: Re: Modal Tuning Course, Melbourne Notice - Rescheduled
- Replies: 8
- Views: 17004
Re: Modal Tuning Course, Melbourne Notice - Rescheduled
We had a total of 17 students at the course held in the excellent facilities of the Northern College of Arts and Technology, in Preston, a northern suburb of Melbourne. The mix of students was outstanding, with a number of well known luthiers and also some young and very keen people at the early end...
- Sun Mar 31, 2024 10:00 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: compensation spreadsheet question
- Replies: 9
- Views: 10819
Re: compensation spreadsheet question
This takes me back 15 years or so when I initially wrote these equations.... I haven't found any errors in the equations and nobody has reported any, so I think they are all OK. But I also got high results for E so I always use the classical string method even for steel strings (though I started out...
- Mon Mar 18, 2024 8:47 am
- Forum: Instrument Builders Forum
- Topic: Carbon Fibre Threads
- Replies: 5
- Views: 652
Re: Carbon Fibre Threads
Design: Section 4.4.6, Paragraph 1.
- Tue Mar 12, 2024 8:37 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: 1st falcate build slowly underway.
- Replies: 3
- Views: 476
Re: 1st falcate build slowly underway.
Looking good, so far Jim.
If you pre-drilled the bridge pin holes (recommended) remember to stick tape over them when you do a tap test. It will give a better indication of where your resonances will end up.
If you pre-drilled the bridge pin holes (recommended) remember to stick tape over them when you do a tap test. It will give a better indication of where your resonances will end up.
- Wed Feb 07, 2024 3:26 pm
- Forum: Instrument Builders Forum
- Topic: Re: Modal Tuning Course, Melbourne Notice - Rescheduled
- Replies: 8
- Views: 17004
Re: Modal Tuning Course, Melbourne Notice - Rescheduled
Hello everyone, It became apparent that many people who wanted to attend the course had family commitments through January that precluded them from attending. Consequently, by popular demand, I have rescheduled the course to a couple of weeks after Easter, namely the 12th, 13th and 14th of April. Ot...
- Fri Feb 02, 2024 4:07 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Natural resonant frequency of uncoupled top
- Replies: 6
- Views: 1682
Re: Natural resonant frequency of uncoupled top
I guess one could say that, in the example above, the monopole mobility using 1/SQRT(Km) is 23.3, but the true MM = 1/SQRT((k + κA^2)m) is 20.0. Because the volume of the box and the area of the piston matter. Two guitars of different body dimensions but the same K and m, don't really have the same...
- Mon Jan 29, 2024 3:33 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Natural resonant frequency of uncoupled top
- Replies: 6
- Views: 1682
Re: Natural resonant frequency of uncoupled top
Any frequency you calculate, by whatever method, is only as valid as the assumptions under which the method was developed. Remember that the published 4-DOF model and input parameters was for a single specific guitar with the K and m values sized so that the model output matched that guitar's specif...
- Mon Jan 29, 2024 11:57 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Natural resonant frequency of uncoupled top
- Replies: 6
- Views: 1682
Re: Natural resonant frequency of uncoupled top
Basically, my question is: what is the meaning of the κA^2 term? Why is it included some times but not others? The simple answer is that MM is meant as a simple and useful way (i.e. not involving a huge amount of maths, or a detailed understanding thereof) of gaining a measure of the responsiveness...
- Fri Dec 22, 2023 1:37 pm
- Forum: Instrument Builders Forum
- Topic: Re: Modal Tuning Course, Melbourne Notice - Rescheduled
- Replies: 8
- Views: 17004
Re: Modal Tuning Course, Melbourne Notice - Rescheduled
Attention those who live in Melbourne, or don’t mind the travel: I will be running one of my 3 day Modal Tuning courses in Melbourne early next year. I’ve lost count of how many times I’ve run this course now, but probably close to 30 times, including 8 times in the USA. It has proved to be very pop...
- Sat Dec 09, 2023 10:00 am
- Forum: Instrument Builders Forum
- Topic: Spraying Hard Shellac
- Replies: 8
- Views: 32258
Re: Spraying Hard Shellac
....And yet another potential source of contamination is oil in the air from your compressor.
- Tue Nov 14, 2023 8:04 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: brace stress
- Replies: 5
- Views: 7736
Re: brace stress
My question is, can I use another method, not transforming the sections? Specifically, can I keep the dimensions as in the drawing, calculate the second moment of area around the neutral axis for each shape, and then multiply the panel Ipanel times Esitka and the total of the braces' I, Ibraces tim...
- Sun Nov 12, 2023 6:29 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: brace stress
- Replies: 5
- Views: 7736
Re: brace stress
Is there any reason it's not correct to do what I've just described: to multiply the I of part of the structure by one E, and the I of another part by different E, to get two EI's, and add them together? I haven't had the time to check out your spreadsheet, Greg, so apologies for that. However, whe...
- Sat Jul 29, 2023 1:24 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Nodes and anti-nodes
- Replies: 7
- Views: 26612
- Fri Jul 14, 2023 12:18 pm
- Forum: Instrument Builders Forum
- Topic: Nomad nut files
- Replies: 9
- Views: 35059
Re: Nomad nut files
Japarts seem to be selling sets of 3 files. Angkor are selling a set of 8 (and they're sold out!)
- Wed Jul 12, 2023 8:51 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Visual Analyzer Settings
- Replies: 9
- Views: 14263
Re: Visual Analyzer Settings
The "Run as administrator" thing is another of those XP to Win 7 conversion issues. As viruses and things proliferated, MS bumped up security levels, so only those with Administrator rights could do certain things, like save *.ini files, for example. Theses issues were, of course, addressed in the l...
- Mon Jul 10, 2023 7:25 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Visual Analyzer Settings
- Replies: 9
- Views: 14263
Re: Visual Analyzer Settings
That error message occurs on Windows 10 systems and likely Win 11, too. When I made the videos with Robbie I was using Win 7 on my computer, and the error message seems not to appear in Win 7, though the effects are there. As VA v9.0.6 was written for Win XP it was written to suit the input/output p...
- Wed Jul 05, 2023 12:35 pm
- Forum: Instrument Builders Forum
- Topic: Trouble Build
- Replies: 20
- Views: 153496
Re: Trouble Build
That shouldn't create a problem.
Definitely worth investigating.johnparchem wrote: ↑Wed Jul 05, 2023 9:48 amI get noise like that when I am clipping. The gain being too high.
- Wed Jul 05, 2023 8:29 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Visual Analyzer Settings
- Replies: 9
- Views: 14263
Re: Visual Analyzer Settings
Good day, I had to update my laptop which runs iOS 11. Windows 11? VA won't run on Apple/Mac systems. VA version 9.0.6 was built for Win XP which has different I/O requirements from Windows 10 (Win 11 I'd expect to be much the same as Win 10, but I haven't tested it). 9.0.6 runs fine on Win 10. Ins...
- Tue Jul 04, 2023 10:42 pm
- Forum: Instrument Builders Forum
- Topic: Trouble Build
- Replies: 20
- Views: 153496
Re: Trouble Build
Those are fairly nasty looking VA plots, Martin. Lots of background noise or something else going on?
- Tue Jul 04, 2023 8:43 am
- Forum: Instrument Builders Forum
- Topic: Trouble Build
- Replies: 20
- Views: 153496
Re: Trouble Build
Neck relief? Back buzz? Truss rod? Loose neck attachment hardware? Pick-up if fitted?
- Sat May 27, 2023 2:44 pm
- Forum: Instrument Builders Forum
- Topic: Chladni and VA tests ???
- Replies: 61
- Views: 80467
Re: Chladni and VA tests ???
The neck can be involved in some modes, so its best to have it free. The neck is permanently connected. It’s like a modern Spanish heel connection I’ve been doing to complicate my life more! When I said free, I meant not clamped in a vise! Basically, try to mimic the conditions the guitar is in whe...
- Sat May 27, 2023 10:53 am
- Forum: Instrument Builders Forum
- Topic: Chladni and VA tests ???
- Replies: 61
- Views: 80467
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: 30673
Re: eBook edition?
Unfortunately, my crystal ball is no better than Philip Lowe's.