Search found 56 matches

by mqbernardo
Thu Apr 19, 2018 9:06 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Measuring top and back frequencies while voicing
Replies: 21
Views: 6731

Re: Measuring top and back frequencies while voicing

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...
by mqbernardo
Tue Feb 20, 2018 12:30 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Flamenco build details from the book
Replies: 6
Views: 725

Re: Flamenco build details from the book

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...
by mqbernardo
Sat Jan 20, 2018 12:12 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Along and Across Grain Stiffness Ratio
Replies: 3
Views: 651

Re: Along and Across Grain Stiffness Ratio

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.
by mqbernardo
Mon Aug 14, 2017 1:52 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: I lost the monopole...
Replies: 20
Views: 6041

Re: I lost the monopole...

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...
by mqbernardo
Mon Aug 14, 2017 1:44 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: I lost the monopole...
Replies: 20
Views: 6041

Re: I lost the monopole...

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...
by mqbernardo
Fri Aug 04, 2017 7:15 am
Forum: Instrument Builders Forum
Topic: Plane manufacturers
Replies: 30
Views: 6409

Re: Plane manufacturers

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 ...
by mqbernardo
Sun Jul 30, 2017 4:16 am
Forum: Instrument Builders Forum
Topic: Plane manufacturers
Replies: 30
Views: 6409

Re: Plane manufacturers

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.
by mqbernardo
Sun Jul 30, 2017 4:16 am
Forum: Instrument Builders Forum
Topic: Bridge Pins - 12 String Guitar
Replies: 5
Views: 1224

Re: Bridge Pins - 12 String Guitar

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...
by mqbernardo
Sun Jul 30, 2017 4:14 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: I lost the monopole...
Replies: 20
Views: 6041

Re: I lost the monopole...

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...
by mqbernardo
Sun Jul 30, 2017 1:25 am
Forum: Instrument Builders Forum
Topic: Bridge Pins - 12 String Guitar
Replies: 5
Views: 1224

Re: Bridge Pins - 12 String Guitar

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.
by mqbernardo
Sat Jul 29, 2017 9:20 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: I lost the monopole...
Replies: 20
Views: 6041

Re: I lost the monopole...

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...
by mqbernardo
Sat Jul 29, 2017 9:13 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: I lost the monopole...
Replies: 20
Views: 6041

Re: I lost the monopole...

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......
by mqbernardo
Sat Jul 29, 2017 9:05 am
Forum: Instrument Builders Forum
Topic: Plane manufacturers
Replies: 30
Views: 6409

Re: Plane manufacturers

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...
by mqbernardo
Sat Jul 29, 2017 8:39 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: I lost the monopole...
Replies: 20
Views: 6041

Re: I lost the monopole...

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...
by mqbernardo
Sat Jul 29, 2017 2:59 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: I lost the monopole...
Replies: 20
Views: 6041

Re: I lost the monopole...

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...
by mqbernardo
Thu Jul 27, 2017 9:53 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: I lost the monopole...
Replies: 20
Views: 6041

I lost the monopole...

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...
by mqbernardo
Thu Jul 20, 2017 10:22 am
Forum: Jigs & Fixtures
Topic: Jet/Performax 10 - 20 drum sander again
Replies: 13
Views: 9349

Re: Jet/Performax 10 - 20 drum sander again

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.
by mqbernardo
Thu Jul 20, 2017 9:25 am
Forum: Instrument Builders Forum
Topic: I'm retiring
Replies: 45
Views: 11510

Re: I'm retiring

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...
by mqbernardo
Fri Apr 28, 2017 8:32 am
Forum: Instrument Builders Forum
Topic: Rosettes using flat sawn wood
Replies: 8
Views: 2076

Re: Rosettes using flat sawn wood

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...
by mqbernardo
Thu Jul 28, 2016 9:14 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Equation 4.5-7
Replies: 55
Views: 18007

Re: Equation 4.5-7

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...
by mqbernardo
Thu Jul 28, 2016 10:04 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Equation 4.5-7
Replies: 55
Views: 18007

Re: Equation 4.5-7

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...
by mqbernardo
Thu Jul 28, 2016 2:09 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Equation 4.5-7
Replies: 55
Views: 18007

Re: Equation 4.5-7

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...
by mqbernardo
Wed Jul 27, 2016 1:05 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Equation 4.5-7
Replies: 55
Views: 18007

Re: Equation 4.5-7

Here´s an attached PDF. values are on page 3.
by mqbernardo
Wed Jul 27, 2016 12:56 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Equation 4.5-7
Replies: 55
Views: 18007

Re: Equation 4.5-7

Sorry for beating up this dead horse, but it seems that everyone going through the book must pass through this initiation rite... So, Eq. 4.5-7 and i have been doing this little dance lately and i can´t figure my head around it... would appreciate some help. It should be said that i had never used a...
by mqbernardo
Thu Sep 24, 2015 8:14 am
Forum: Instrument Builders Forum
Topic: Trevor Gore Course - Contemporary Guitar Design and Modal Tuning
Replies: 14
Views: 4941

Re: Trevor Gore Course - Contemporary Guitar Design and Modal Tuning

Trevor, how can one enroll in one of those (eventual) german courses? I'm definetly interested - if price is not prohibitive.

Thanks,
Miguel.