Australian/New Zealand Luthiers Forum

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

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...

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...

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.

Good to hear, Wayne!

This might get things moving again...

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...

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...

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...

kiwigeo wrote: ↑

Wed Apr 24, 2024 2:56 pm

Will there be beer??

If history is anything to go by, whiskey and wine!

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.

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...

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...

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.

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.

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...

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...

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...

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...

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...

....And yet another potential source of contamination is oil in the air from your compressor.

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...

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...

kiwigeo wrote: ↑

Fri Jul 28, 2023 8:26 pm

Trevor?

A somewhat cheesy explanation.

kiwigeo wrote: ↑

Fri Jul 14, 2023 9:12 am

How can this sort of mark up be justified???

Japarts seem to be selling sets of 3 files. Angkor are selling a set of 8 (and they're sold out!)