Australian/New Zealand Luthiers Forum

sorry, forgot to say its gonna be an all wood lattice (spruce and no CF). maybe its gonna get it closer to a traditional top thickness. this is all new to me.

Hello, i haven't found info specific to this topic, but if there is one, i apologise. I´ve used the Books to estimate target plate thickness on my latest builds using famed equation 4.5-7 (iirc). The vibrational stiffness parameter (f) I've used is the same Trevor gives in the book (60). They all ha...

not the help you need, but i´m building a pernambuco guitar ATM - i didn´t do frequency tests as i´d thought it would be too heavy for a live back (mine is above 1 g/cm3). i can tell you that the wood is a PITA to plane, and showed a lot of spring-back after bending. a further nuisance is that the w...

Brian says you can just tape the back on? Hi Jim. Easy to check for yourself. On his site Brian shows very good correlation.I did it twice, but I only have results of my last guitar at hand: No Back: Air x Mono 203 Dipole 260 Tripole 364 Back taped: Air 100 Mono 223 Dipole 244 Tripole 355 Back Glue...

for a flamenca i´d go with dentellones/peones and put them more widely spaced than on a classical, say, about 5mm apart. the thing, for me (but I'm no expert!) with flamenco is bridge height and action. you really want them low. the rest of the design stems from there (IMHO). so, bridge height aroun...

Hi Mitch, Tevor has already given (at least one) courses in the northern hemisphere. Maybe one day he could come to europe? i´d be in.

So, I was talking to a friend and he said that the monopole should still be there, but its frequency being closer to the dipole whenever I excite the top more on one side than the other it favors the formation of the dipole. I still get a lot of tea leaves movement when I excite the center of the lo...

Ok, Back at it. Box is bound. The behavior is still the same, i.e., I can only find a dipole near the strongest resonant peak. Didn't get the time to take pics of the chladni tests, but they're pretty much like the ones I've posted earlier. I did a quick FFT spectrum using the phone's mic. Strongest...

I have to say that my impression is different: I think that quiangsheng's blade steel (t10 - I'm no expert, dont know what it is except that it's an "high carbon steel") holds its edge rather well, for my needs it's in A2 territory. and it's not that hard to sharpen. I've bought a veritas blade for ...

https://www.finetools.com.au/collection ... hand-plane

just googled and fond this site, so quangsheng has a distributer down under. no affiliation, never used their services, can't vouch for them... usual disclaimers. but worth a look.

https://www.finetools.com.au/collections/bench-planes/products/luban-no5-low-angle-hand-plane just googled and fond this site, so quangsheng has a distributer down under. no affiliation, never used their services, can't vouch for them... usual disclaimers. but worth a look. sorry, this answer got i...

Trevor, Thanks for chiming in. So i´ll see what happens after binding goes on. I usually do chladni tests after each stage of building the box (bare plate, uncarved and carved braces, sides on, box closed, box bound and bridge glued). This is the 1st time i noticed this behaviour. Regarding audacity...

https://www.finetools.com.au/collection ... hand-plane

just googled and fond this site, so quangsheng has a distributer down under. no affiliation, never used their services, can't vouch for them... usual disclaimers. but worth a look.

To add to the strange guitar part...I don't know if many around here do the chladni stuff on free tops. I do it just as a check - no fancy voicing. Usually the mode in the pic (the "panty") shows up between 190 and 210 Hz. my lowest was 190, this one only gets to 166. It was not an heavy top, and ev...

Dunno. Good question. I suppose it could lower it (like a tornavoz) but maybe it's not stiff enough. I was asking myself the same question. For a number of reasons I had to leave a tiny bit of the kerfed linings proud of the edges of the sides on the lower bout. It's not a great length, but still......

Reconditioning / refurbishing old planes is almost an artwork in itself. i liked doing mine (a Stanley 4 1/2 and 212 scraper type 11 planes) but now I prefer to invest my time elsewhere. Problem is most vintage, pre-war (1st one that is) nice stanleys are over priced imo (at least here), and some ne...

Jim, the clamps were just for a quick n'dirty test before gluing. All seemed nice then. The 1st pic and the tap spectra are from the closed box (Back glued). No bindings yet but I expected a monopole appearing. 1st time this happens to me. I'm just puzzled. The same thing actually happened to a frie...

hey guys, thanks for chiming in. my normal procedure is both chladni and tap tests. i don´t know what to do from them, but i still do it in the belief that stuff might coalesce in the future. anyway, this present guitar has a 0,39 g/cm3 and 5700 m/s euro spruce top and a 0,557 g/cm3 and 10 Gpa MOE m...

Strange thing (I guess) happened to me. After closing the box on a Blanca, I can't seem to find the monopole. Tea leaves start vibrating around 200 hz, in what appears to be a fuzzy monopole but it doesn't quite settle in. The figure gets into focus at about 230 Hz, but then it's a dipole that shows...

I also should thank Ken for saving my 10-20. He even shoot a video so that if you're dumb like me, there's still little chance you screw up. Not that I didn't try...


Thanks ken, your work should be lauded.

Best,
Miguel.

Bob, just want to thank you for setting this forum up and having things running ever so smoothly. I wish you good luck with your future adventure, it must be an exciting prospect. If you ever feel the need to come to the other tip of the world hunting for barrels I can take you on a guided tour to s...

I think you mean side grain, or perhaps face grain? I've done mostly those. No problems so far but I also inlay them on the thin side, like Allen, around 1,2 mm - maybe less. If you inlay a material that doesn't move on a rebate of material that does move with humidity fluctuations you have differen...

OK, just compared your corrections with my original spreadsheet. While i could go on forever without knowing the SI units for MOE, i can´t believe i did the same error over and over with the divider on Eq 4.5-7... it´s really confusing me... anyway, values seem to be much closer to yours... close en...

Thanks a lot Trevor! can´t wait to get back to the shop and check it. also curious to compare it with my own sheet and find where the errors lie. you´re right, doing it yourself is often the best way to make sense of things. but a little help does go a long way! it was fun going through this stuff a...

Thanks guys, so it appears i´m even more stupid than my ego would let me think... who´d have told? :) Martin, i got lost somewhere in your kiwi humor... Trevor, thanks for the help. I just emailed you my spreadsheet. As i told you in the mail it was made in open office and then exported to .xls form...