Australian/New Zealand Luthiers Forum

You get a, quote, "perfectly joined top or back with no misalignment..."

What about this near end of the joint? See end of video, (2.00).

I usually do it in one hit, Dom, because I like the idea of it all setting up together, but there's no great rationale to that. I can't see any problem with what you're about to attempt. You'll still need to pre-drill for the bridge pin holes and dowel the bridge plate so that it doesn't move when y...

kiwigeo wrote: Discovered how tough CF cloth impregnated with epoxy is when I ran my plane over the blank.....left a dirty big nick out of the plane blade

It'll do the same to tungsten carbide, too!

You can run the C and E components to any fret you like. If you do a more traditional neck joint with the fretboard extension glued down, probably best to stop at the neck joint fret, because, depending on when you do your fretting, you may not be able to control the build geometry well enough over ...

The neck is modelled as a superposition of a circle, an ellipse and a straight line rather than one type of curve running into another. So, for example, if the elliptical component is zero, all you have is a tilted section of a circle. Alpha=0.5 puts equal weighting on the circular and elliptical co...

kiwigeo wrote:Mic was around 50-60mm from bridge area.

Martin, try backing the mic off to ~50-60cm. I should have picked that one up last time I asked you! Sorry about that.

When I play (and tap) only the edges are in contact.

Martin, have you tried just holding the guitar as is you were playing it, and then tapping it?

What Jeff said. (Thank you, Jeff!)

I was forgetting that you already have the neck on, being a Spanish foot build! That means you may well have some corpus modes showing up which I wouldn't normally be seeing at this stage (and they don't often show up later, either). At least one (or even more) of those "spare" monopoles is likely a...

jeffhigh wrote:Trev, Trev, I'm heartbroken by this rejection......

You'll get over it. Try some of that red medicine that comes from down Martin's way.

kiwigeo wrote:I wonder what sort of tap test a chocolate would give??

Sounds like it's time to be tapping into a barrel of that Coonawarra that your compatriots are so adept at producing.

I dunno Martin, I'm sitting here with a glass of wine , looking at pictures of falcates and nothing is coming up so to speak Am I doing something wrong or have I just reached the age where a man needs some chemical assistance? Do I need to take Trevor out for dinner first or send him chocolates? Je...

kiwigeo wrote:For chaldni testing Ive had the guitar sitting in the carrier that I use on my binding channel cutting jig. This means the back is free to vibrate when doing top patterns and vice versa when doing the back.

... and possibly means the carriage is acting as side mass...

Foam wedges seem to work OK.

Martin, just hold the guitar as you would if about to play it. No need to make things any more complicated. Tap with a small rubber tapper (a bit of eraser or super-ball on the end of a thin stick). My current tapper is a piece of super-ball on the end of a bamboo skewer. The natural frequency of th...

Note also I have been doing the recording with the guitar standing on its end on the bench and mic hanging from the ceiling. I note that you actually hold the guitar in a normal playing position during your testing. Ah, that could explain things. You may well be measuring the response of the guitar...

VA settings are as per guidelines in your book and Doms notes. Im running a Shure mic through a preamp and into line input on my Mac. The mic is 50-60mm from bridge centre and Im tapping on the bridge. Recording with the mic 50-60mm from soundhole doesn't make much difference to the peaks....just a...

Just wondering, trev , can you substitute englemann spruce for bracing on the falcate classical top?? also what species of bracing is being used for the back on this oz blackwood classical ?? thanks Ernie, just go for the stiffest, least dense stuff that you can bend. Some spruce just won't bend wi...

Martin, how are you doing your data gathering? (VA settings, type of mic etc.) There seems to be a lot of stuff going on that I don't normally see and I especially don't see the T(1,1)2 go up in frequency as the top is thinned around the periphery. I normally glue the top and back on (which "seals" ...

Martin, are you sure that's the T(1,1)3 at 262Hz? A quick way to check is to tap the back (mic'ing the back) and you should see a high peak ~260Hz if it is the T(1,1)3. Otherwise, you could check it with poppy seeds on the back.

Sorry Taffy. I'm a bit late on to this one. I haven't come across your specific problem, also having fitted numerous sets. However, there is a related phenomenon that occurs most of the time, but mostly it isn't a problem and it might help you sort things out. After I'd discovered how to fix the pro...

I cross-grain plane backs to close to target with a #5 or #5 1/2 standard-angle plane and finish up with my custom high-angle #6, (60 degree) in line. If I need a higher angle, I use the Veritas bevel-up adjustable mouth jack. On tops I'll use a #5 1/2 standard angle or a #7, depending on whether I ...

Love that height-adjustable work bench!

Here's another one; five piece top, four piece back. No need to worry about the number of pieces!

I just had a close look at this on a classical guitar with the T(1,1) at 100Hz and the T(1,1)2 at 191Hz. The guitar was perfectly tuned on the open strings and played G in tune (according to my Korg CA-1 chromatic tuner) when I plucked the G (3rd fret 6th string) in a fairly normal position. I moved...