Australian/New Zealand Luthiers Forum

In my last Ukulele build, I tried positioning the back braces on the nodes of the back (the free back plate that is) thinking that these nodes do not vibrate and so would be a good place for a brace. I could not detect any improvement in volume.

This is what I use for a re-saw fence. A short rounded square. You can adjust the piece if the cut want to drift.

if your current frequency is 50Hz, then the 47 peak is probably some noise from the current. Make sure you do not place your microphone on the same table as your computer or use some foam to isolate it.

I am no expert in compensation, but someone (don't remember who) mentioned something which I am still digesting. If you compensate the nut and you put a capo on a fret, the total length of the string is still shorter compared to a non compensated. So the nut compensation will make a difference with ...

LSA is now at version 1.7. Also there is now a Linux version as well. You can find the versions here: Windows: https://drive.google.com/drive/folders/1X4FSJKr_xdisqzpeUNJYVBuAeHgzvdnP?usp=sharing MacOS: https://drive.google.com/drive/folders/1oGqALjZbIEzcvmBvFxp87wma6DI_mu6z?usp=sharing Linux: https...

What I do is tap and record the back. It should confirm if 230 is the right peak for T(1,1)3. The back tap willl be close to the T(1,1)3

LSA is now available for Mac users. You can find a copy Here: https://drive.google.com/drive/folders/1oGqALjZbIEzcvmBvFxp87wma6DI_mu6z?usp=sharing Please consult the readme file for instructions. This has not been tested intensively, please report any problems. The windows version is still available...

I have no idea how a Flamenco spectrum should look. But based on your numbers and the back tap, I would say the T(1,1)3 is that little bump around 217 Hz. It look like the back is not contributing much to the top resonance.

If you record a tap of the back this will give you an aproximation of where the T(1,1)3 is.

If you like "science building" make sure you visit https://ukuleles.com/

I just did that recently on a 000. You need to reduce top stiffness. Your best bet is reducing the X brace height. Here is a spectrum of the original : 000 top.jpg The next chart show how it changed after 1, 2, 3, carving session of the braces. Notice that the air mode did not changed much as this i...

You can try my software Luthier Spectrum Analyser (free Demo). It is already setup for luthier usage. There is a windows version here: https://drive.google.com/open?id=1X4FSJKr_xdisqzpeUNJYVBuAeHgzvdnP I have also a Mac version, but this is still a Beta version. It need more testing (looking for tes...

Update: I have made several additions/improovments to LSA. It now come with an installer , which may make things easier for some. The "sound shape" graph is now saved with the spectrum. The cursor now show the frequency in the status bar, the decay/duration can be measured with a left click, Etc. Yo...

56nortondomy wrote: ↑

Tue Nov 12, 2019 4:49 pm

I'd like to see how you do it too Steve.
Wayne

+1

Beautifull instrument, well done, congratulation.
This is a 14 frets to the body. Did you change the scale length or just moove the bridge?

Could be the bridge or the NUT or a bad string.
I would start with the nut. Make sure the string contact point is at the very edge of the front of the nut and not at the back.