Search found 1628 matches

by Trevor Gore
Wed Nov 13, 2024 10:36 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: DIY Sig Gen/Amp unit for Chladni patterns
Replies: 45
Views: 183002

Re: DIY Sig Gen/Amp unit for Chladni patterns

I played around with the above kit to try and find a user friendly configuration for teaching purposes. I wasn’t altogether successful, but here’s what I did and some of you might figure out how to do things better (and let us all know about it!) First, I wasn’t totally convinced about the security ...
by Trevor Gore
Tue Nov 05, 2024 10:51 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: DIY Sig Gen/Amp unit for Chladni patterns
Replies: 45
Views: 183002

Re: DIY Sig Gen/Amp unit for Chladni patterns

Because the Facmogu amp is so small, it will fit inside the speaker tube. P1010027cs.jpg It can be controlled via Bluetooth from VA on your PC, so access to the amp itself is not required. This installment shows you how to mount the amp in the speaker tube. The only external “hard” connection requir...
by Trevor Gore
Mon Nov 04, 2024 8:42 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: DIY Sig Gen/Amp unit for Chladni patterns
Replies: 45
Views: 183002

Re: DIY Sig Gen/Amp unit for Chladni patterns

A minor clarification: Where I said... You should hear a 1kHz sine wave through your left computer speaker. If not, check that you have your speakers on in Windows and then check the “Dev” (for Device) tab on the initial VA screen. On the “Dev” tab select an appropriate output device. Hopefully that...
by Trevor Gore
Sun Nov 03, 2024 4:17 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: DIY Sig Gen/Amp unit for Chladni patterns
Replies: 45
Views: 183002

Re: DIY Sig Gen/Amp unit for Chladni patterns

According to Google translate, Facmogu means "Send out mushrooms" :wink: This next part is about using the Sig Gen functions in Visual Analyser. There are many versions of Visual Analyser and most of the time I use one of the earliest versions (v 9.0.6) because it does what I want with least hassle....
by Trevor Gore
Sat Nov 02, 2024 5:47 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: DIY Sig Gen/Amp unit for Chladni patterns
Replies: 45
Views: 183002

Re: DIY Sig Gen/Amp unit for Chladni patterns

OK, there weren't may suggestions there! But we'll move right along, anyway! Those of you who wanted to get into Chladni patterns but were daunted by the build complexity of the kit shown above, rejoice! There is a much simpler solution, versions of which many of you will have adopted already, namel...
by Trevor Gore
Tue Oct 29, 2024 3:24 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: DIY Sig Gen/Amp unit for Chladni patterns
Replies: 45
Views: 183002

Re: DIY Sig Gen/Amp unit for Chladni patterns

I am re-visiting the DIY sig gen topic due to new hardware becoming available that looks very promising (having already tested it). What I am seeking now is a sig gen app (preferable for free, but not necessarily so) that will run on a PC where the frequency is continuously adjustable using a mouse ...
by Trevor Gore
Tue Oct 29, 2024 8:26 am
Forum: Instrument Builders Forum
Topic: chamfering braces
Replies: 17
Views: 9991

Re: chamfering braces

Yikes!!! I gave up using collet reducers many years ago, due to eccentricity issues. I never had an incident, but it always looked like one waiting to happen. I now only use routers where proper interchangeable collet sizes are available (primarily DeWalt (1/4", 6.00mm, 1/8") , Makita (1/4", 1/8"), ...
by Trevor Gore
Mon Oct 28, 2024 8:52 am
Forum: Instrument Builders Forum
Topic: Pore fill question
Replies: 39
Views: 89431

Re: Pore fill question

Thanks, Nigel and Allen.

Cheers, Trevor.
by Trevor Gore
Sun Oct 27, 2024 10:46 am
Forum: Instrument Builders Forum
Topic: Pore fill question
Replies: 39
Views: 89431

Re: Pore fill question

A question to both Nigel and Allen: Do you have any concerns regarding the longevity of CA as a finish? I ask because I finished an internal door knob with CA over a year ago, it gets handled multiple times a day and the finish is holding up fine. On the other hand, at the same time, I finished anot...
by Trevor Gore
Sat Oct 26, 2024 11:01 am
Forum: Instrument Builders Forum
Topic: chamfering braces
Replies: 17
Views: 9991

Re: chamfering braces

Double post, sorry.
by Trevor Gore
Sat Oct 26, 2024 10:50 am
Forum: Instrument Builders Forum
Topic: chamfering braces
Replies: 17
Views: 9991

Re: chamfering braces

Hi I'm chamfering 20x10 spruce using 'the book' method of screwing the brace to a rebated fixture and freehand routing on a table against the top bearing. It all seems a bit hazardous- the 1/2' router is a beast! Anyone got a better way apart from hand planing? thanks mac IMG_5081.jpeg The screw ho...
by Trevor Gore
Sat Sep 21, 2024 11:09 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Help with bridge rotation
Replies: 8
Views: 8053

Re: Help with bridge rotation

I've got one of those angle cube things. Mine's by iGaging. It doesn't have any "stickiness" like yours seems to have, though.

Three thoughts:
1) There's some damping going on that you may be able to adjust or switch off
2) You have a faulty gauge
3) That's just how it is with that brand
by Trevor Gore
Thu Sep 12, 2024 8:55 am
Forum: Instrument Builders Forum
Topic: tapping plates
Replies: 2
Views: 2805

Re: tapping plates

The reason for the 4mm thickness number is so that (across a variety of different species) you still have the ability to reduce it to your target. Looking through my EIR data, I have target thicknesses ranging from 3.1 mm (medium sized guitar, wood with high long-grain runout) down to 1.9mm (small b...
by Trevor Gore
Tue Jul 23, 2024 1:47 pm
Forum: Instrument Builders Forum
Topic: Bracing question
Replies: 4
Views: 6702

Re: Bracing question

I am building a Gore/Gilet type SS (no cutaway but the more modern shoulder as in Drawing 4) I made the back braces as per the text 20mmx10mm gabled. And glued them in place. Now I notice on the drawings for a live back (Drawing 6), the back braces are 6.3x16. Drawing 6 is a composite drawing showi...
by Trevor Gore
Fri Jun 14, 2024 8:46 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Top Deflection rig
Replies: 47
Views: 105776

Re: Top Deflection rig

GregHolmberg wrote:
Thu Jun 13, 2024 11:13 am
Is it telling me something about the guitar, or something about the rig?
Most likely the rig. The fewer moving parts (to minimise slop and backlash) and the lower the friction the better.
by Trevor Gore
Fri May 24, 2024 2:04 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Where has everyone gone?
Replies: 8
Views: 22408

Re: Where has everyone gone?

This might get things moving again...
by Trevor Gore
Fri May 24, 2024 2:02 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Edition 3 now available
Replies: 0
Views: 12683

Edition 3 now available

After being too long out of stock, supplies of the 3rd Edition of Contemporary Acoustic Guitar Design and Build are now available, but currently only from here . P1080120pcs.jpg There are many small detail changes, but the major ones include: 1) A much better index 2) A new foreword by Gernot Wagner...
by Trevor Gore
Thu May 02, 2024 12:16 am
Forum: Instrument Builders Forum
Topic: Truss rod construction questions
Replies: 11
Views: 15536

Re: Truss rod construction questions

One question: do you re-harden the M8 25mm grub screw after working it? If you let the grub screws just air cool after heating, they will harden up to more-or-less their original hardness, so remember to take the heat down slowly. I usually just put a tin can of grub screws in the wood burner at hi...
by Trevor Gore
Wed May 01, 2024 1:27 pm
Forum: Instrument Builders Forum
Topic: Truss rod construction questions
Replies: 11
Views: 15536

Re: Truss rod construction questions

I was hoping someone in the Brisbane area might have some local knowledge on this. The places to look for are steel stockists e.g. maybe these guys: https://earlybirdsteel.com.au/ . There may be some good offers going as they seem to be closing down soon, but there must be other similar suppliers in...
by Trevor Gore
Wed Apr 24, 2024 4:42 pm
Forum: Instrument Builders Forum
Topic: Re: Modal Tuning Course, Melbourne Notice - Rescheduled
Replies: 8
Views: 30218

Re: Modal Tuning Course, Melbourne Notice - Rescheduled

kiwigeo wrote:
Wed Apr 24, 2024 2:56 pm
Will there be beer?? :mrgreen:
If history is anything to go by, whiskey and wine!
by Trevor Gore
Wed Apr 24, 2024 12:36 pm
Forum: Instrument Builders Forum
Topic: Re: Modal Tuning Course, Melbourne Notice - Rescheduled
Replies: 8
Views: 30218

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.
by Trevor Gore
Tue Apr 23, 2024 8:29 am
Forum: Instrument Builders Forum
Topic: Re: Modal Tuning Course, Melbourne Notice - Rescheduled
Replies: 8
Views: 30218

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...
by Trevor Gore
Sun Mar 31, 2024 10:00 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: compensation spreadsheet question
Replies: 9
Views: 21709

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...
by Trevor Gore
Mon Mar 18, 2024 8:47 am
Forum: Instrument Builders Forum
Topic: Carbon Fibre Threads
Replies: 5
Views: 7365

Re: Carbon Fibre Threads

TallDad71 wrote:
Mon Mar 18, 2024 5:07 am
...I am certain that Trevor and Gerard are right to recommend adding Carbon Fibre but I can't work out why. Any guidance is gratefully received.
Design: Section 4.4.6, Paragraph 1.