Australian/New Zealand Luthiers Forum

I don't think I would use thixotropic for this, you would want to use the ordinary thin resin so that you saturate the CF Tow.

It is also important to recognise that the CF capping is not just about increasing stiffness, it is providing resistance against long term creep whilst providing an appropriate stiffness. So you don't get excess bridge rotation and belly behind it with advancing years. And yes, there is no need to r...

Hi Francis It's looking good I have only ever used CF capped top and bottom Falcate braces. Looking at what you have done with laminating in a central strip of sapele, unfortunately it will NOT have increased the brace stiffness compared to just using spruce. The published Modulus of elasticity for ...

10 will work if -you have an appropriate tuner layout -you have a 1/4'' thickness fretboard (and a thin headstock overlay) -you don't have excess tuner post protrusion Only time I have seen a problem with a low angle headstock angle was on some Maton Mastersound electrics with their usual thin fretb...

The calculations look fine, the measurements and weight are producing an appropriate density, the frequency is what I would suspect.

Using your figures Felix, I get the same result, But at 5 times the regular stiffness without a high density there is something happening, perhaps an interaction between modes that is preventing you measuring the fundamental frequency?
It would warrant static deflection testing to confirm.

That's alot stiffer than the stuff Ive got in my shop......the highest Youngs Modulus values I got were around 6GPa. Measured a few other pieces picked at random from my pile - ranges from 12 gpa - 38 gpa Your wood is John Holmes wood....perfect for falcate braces..... :cl :lol: Very unlikely, rech...

Women don't argue, they just bitch about their friends behind their backs.

I think that the problem is that the term "Hand Made" is seen as by some as implying some additional intrinsic worth. I have seen quite a few Handmade guitars with less than stellar workmanship. One in particular, by a highly regarded overseas luthier, besides some cosmetic issues, had a 7th fret th...

I don't buy the "air gap between the neck and pocket can cause moisture to get into the heel of the neck" concept.

This is based on the premise that more contact area = more energy transmission. I have never seen any experimental or theoretical proof as to why this should be so. By the same argument acoustic guitars with adjustable necks should have less sustain than acoustics with glued/bolted on necks. And th...

This is based on the premise that more contact area = more energy transmission.
I have never seen any experimental or theoretical proof as to why this should be so.

All sorts of ways of doing it. but I really don't believe there is any advantage in the full contact shim.

A customer of mine has a friend in Japan who sends him guitars for resale on Ebay Australia. A while back he brought me a couple of archtops, one of which looked very much like yours with the wide binding, but with the original dark finish. It was a horrible guitar, bad neck angle,huge non adjustabl...

A couple of comments -I would not expect a back monopole to encompass the whole back, but only the lower bout, that 235 Hz result looks like a monopole to me -Using a radially braced back does not guarantee that it will be live, that will depend on stiffness and mass Is this the AGMS modification of...

I was looking at the picture of the soundboard wrong, looked to me like parallel braced capped with CF when it was actually grooves.

Do the ribs contact the top, or are they just breaking up the air resonance?

No I did not do any deflection testing prior to closing, I did think it was a bit firm so I took the braces down from 19 to 16 as I recall. I think a lot of the strength and stiffness of the soundboard came from doing a tapered pliage (max at centre to nothing at rim) and then jointing the plates an...

Whilst on an archtop the outside of the brace is uniformly in tension, in a flattop with fixed bridge that side is in tension in front of the bridge and in compression behind. Besides any increase in stiffness the big advantage of CF capping is to avoid long term creep under load (which wood is susc...

The 3K as I understand it is a fibre count, I gather Tow just refers to an unwoven or untwisted stand.You Just use one strand, I use it top and bottom as does Trevor but the local school here has simplified it to only apply to the outer face of the brace. I won't speculate as to why.

Its 3k
I pull the strands from plainweave cloth 198 gram/m2

From these guys
http://www.ebay.com.au/itm/Carbon-Fibre ... SwBnVW~FLN

Also epoxy resin from them

You could do that, just have to make the appropriate decisions on neck angle etc to give you a suitable break angle over the saddle, not too much nor too little

Hard to say, depends on your priorities for feedback resistance. I have only built one acoustic bass it was full flattop acoustic with a pin bridge, but I built this to be quite acoustically responsive especially to the fundamental and this may not suit you for a loud performance situation. You coul...

Personally, if I wanted an upright sound I'd probably go with some form of piezo bridge pickup rather than the magnetics(or as well as) That way you are driving the pickup from the bridge location ala upright rather than just picking up from locations along the string. Also consider some form of str...

What about going es335 style with a centreblock inside the body?