Australian/New Zealand Luthiers Forum

Dave, I got the wood at Cook Woods https://www.cookwoods.com/ . The pernambuco really darken with age. The board that came in was a very different color than the surfaced wood I have now. It has the stiffness and density I would expect. Here is where I am at. I need to do the final prep for finishin...

Not in Europe, but I use sitka and englemann spruce. I thickness to 1.7 mm strips and bend them to form on a hot pipe before laying them up. What issues have you had with spruce.

johnparchem wrote: ↑

Mon Mar 11, 2019 3:24 pm

... T(1,1)1 90 Hz T(1,2) 195 Hz and T(1,3) 261 Hz. ...

Should be T(1,1)1 90 Hz T(1,1)2 195 Hz and T(1,1)3 261 Hz.

sorry about that :<

Today I bound the body of the guitar with the three piece pernambuco back. This is a contemporary classical edging on being a crossover with a 49 mm nut. I took my first tap and was happy with the results without a bridge I am at T(1,1)1 90 Hz T(1,2) 195 Hz and T(1,3) 261 Hz. I get a pretty good res...

I could not see that it was cracking the finish. If it was cracking at all the finish would be cracked. I just had a very figured cocobolo back this did move not even crack on a grain line and it open a finish crack. I refinished but told the owner that the finish my crack there again.

I think you are good; whats a thin strip of top relative to the mass of the bridge? Just a thought, if you are OK with the current width of the saddle slot, glue in a strip of rosewood just thick enough to give you the correct slot depth into the slot. Then there is no need to reroute. You have it e...

The guitar looks great and I bet it has a good voice as well. I just round the end of my fret boards off short of the 19th fret.

The acacia top looks great, I never thought to use a flush cut saw like you did on the purflings. This will be a fun guitar build to watch.

Thanks guys! ... I shall certainly try your technique. Dave make sure you check out Greven's description as well. http://www.grevenguitars.com/retopping-demo.html the source I used for the process. Today I handed the guitar off to the young guitarist who had me build it. He was thrilled, he may perf...

... I think my main focus with this guitar is that the back be as "live" and resonant as I can make it. What are some hallmarks of a truly live back? Higher dB on the T(1,1)3? Thanks again for all the help! Chris To me it is the way it couples with the top also I get a much more complex final tap s...

I am with Martin, I would not touch anything now until you see where you are at with the guitar strung up. On my classical guitars the top resonance goes up a bit when I glue on the bridge and down a bit when I string up the guitar, so not a big change from the point you are at. On my steel strings ...

Thank you for the previous kind comments I am FINALLY ready to deliver this guitar Saturday. I finished the top with post catalyzed Royal Lac sprayed on top of a shellac wash coat. I originally French Polished with an amber shellac hoping to give the instrument an older feel to it but I hated the co...

John, I am assuming you're going for a live back because you're computing a target panel thickness. Check what the back panel mass will turn out to be and then compare that with other live back guitars you have made. I'm suspecting that the pernambuco might be too dense and therefore have too low a...

Thanks Simon, those posts were really helpful as I like the way Jim laid out the three piece back.

I am making a new classical guitar with pernambuco sent to me by my client. I have never used it before. I need to make a three piece back as you can see in the picture. pernambuco.jpg I tap tested the wood as I was getting very clean tap tones. I have not tried it on this narrow of a piece. I could...

I built a falcate braced 14 fret to the body Martinish 00 on commission. The owner loves the sound and has recently bought a falcate brace classical guitar of mine as well. I like the the deep or more full bass sounds that I get from 12 fret joins. I tried to talk him into the 12 fret but all of his...

John, That looks great! How were you able to drop the main air that low? I'm primarily building with a Hauser plantilla and my air resonance is usually around 102 HZ and I would like to drop it some. Looking at Trevor's sensitivity analysis it looks like sound hole diameter and back stiffness are m...

As always nice looking work John. As always I am interested in the falcate bracing. You presumably beefed it up a bit for the extra strings so I wonder what height you ended up with? I wonder if you have had time yet to look at resonant frequencies, and perhaps particularly with this one, the bridg...

Thanks Mark, The neck wood is mahogany, I think the light hit it funny in the picture. I build for a customer, but take no deposits. My thoughts are I will try and if I succeed and they still like it they can buy it. If not well it was just like a private build. It has been awhile but she is all str...

I am ready to start cleanup and finish prep on this Bocote\Lutz spruce 8 string crossover commision. The 2 extra strings will be bass strings. I will have to play to see how low to go. The player would like to go down in fourths from the low E. I know I can make the 7th string a D and the 8 string a...

I am not sure it is Q, but when I took a voicing class from Jeffery Elliott a Portland Oregon classical guitar builder, he taught that he consistently thicknesses all of his top spruce panels for evaluation. Then on tapping he wanted to hear it ring for 5 seconds. It seems like the sustain would be ...

Nice work on this guitar. It was interesting to see it built on a work board instead of an outside mold.

I was feeling groovy, All and all it was a easier process. When I carved away parts of the braces I found no gap between the brace and the CF or the CF and the top.

On my latest guitar I am slotting the bottom of the falcate braces for the carbon fiber. It really made the glue up process go a lot better for me. At the Guild of American Luthier auction I bought a router base\table called the Otter by the maker of Luthiers friend. http://www.luthiersfriend.com/aO...

Too much room noise

I tried again this time with the mic a AKG C1000S, about 250 mm away pointing at the 12th fret

https://soundcloud.com/johnparchem/gore ... take-two-3

here is the Martin 00 sized falcate through the K&K pickup.

https://soundcloud.com/johnparchem/kandk-pickup