Search found 546 matches
- Sun Oct 17, 2021 1:43 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Puzzled re adding mass etc…
- Replies: 5
- Views: 17674
Re: Puzzled re adding mass etc…
John Thanks a lot for the reply. I will take your advice and check when strung up. I thought it was to be tested without strings on but as I said it’s my first time to try side mass so I will wait. Can I assume with those figures that you would be trying to get the 178 down to 170?? Dave It depends...
- Sat Oct 16, 2021 3:26 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Puzzled re adding mass etc…
- Replies: 5
- Views: 17674
Re: Puzzled re adding mass etc…
Personally I would not do anything until it was strung up at tension and then measured. I would also evaluate how the guitar sounds. My guess is after being strung up the top will drop a bit (2-5 Hz). Then you may be able to use side mass to get close to 170 Hz if you think you need to lower it. If ...
- Sun Oct 03, 2021 3:05 am
- Forum: Instrument Builders Forum
- Topic: Inside mould
- Replies: 5
- Views: 6823
Re: Inside mould
I have considered using an inside mold for ukuleles but I have never pulled the trigger on my thoughts. I put a pretty good radius on my guitar backs so I have appreciated the support of a mold and spreader as I sand in the radius. I am getting better at cutting my sides close to the finial radiused...
- Sun Sep 05, 2021 1:34 am
- Forum: Instrument Builders Forum
- Topic: Finding the High Points
- Replies: 9
- Views: 8917
Re: Finding the High Points
One other option to chalk is sand paper to mark the high spots on the cheeks. I insert a strip of sandpaper under the cheeks and pull once. The sandpaper will mark the high spots. I use a chisel to remove the high spots. This is not "flossing" as I am not trying to change the neck angle, just mark t...
- Fri Sep 03, 2021 2:31 pm
- Forum: Instrument Builders Forum
- Topic: Finding the High Points
- Replies: 9
- Views: 8917
- Thu Aug 19, 2021 2:34 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Collecting 4DOF models
- Replies: 26
- Views: 43498
Re: Collecting 4DOF models
Just read through the posts. I am not sure it is addressed, does the mass of the top only include the vibrating area of the top not the weight of the top itself. That thought always kept me from weighing the top.
- Sun Aug 01, 2021 11:51 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Soundport and Weight Effects on Frequencies
- Replies: 6
- Views: 13218
Re: Soundport and Weight Effects on Frequencies
Interesting data, I had always planned on playing with the sound port size but never did. My falcate braced classical guitar all have very long sustain relative to my fan braced guitars. I do not use a lower transverse brace on my falcate guitars and I do on fan braced guitars. I am not sure how to ...
- Mon Jul 26, 2021 12:43 am
- Forum: Instrument Builders Forum
- Topic: My third guitar
- Replies: 9
- Views: 7715
- Sun Jul 25, 2021 5:07 am
- Forum: Instrument Builders Forum
- Topic: Beginners question
- Replies: 6
- Views: 6280
Re: Beginners question
... and some seem to end the lower arms of their crossbraces about 10mm from the Kerfing . In this case it seems to me that tension carried by the strings is being held by the glued rim of the soundboard . How does this work ? It’s attractive as I can see that the lower part of the soundboard is fr...
- Tue Jul 06, 2021 11:45 pm
- Forum: Instrument Builders Forum
- Topic: Falcate Bridge Plate Thickness
- Replies: 6
- Views: 4622
Re: Falcate Bridge Plate Thickness
If I recall there were two options, the thicker one was to be used if the CF fabric under the bridge plate was not used.
- Fri Jul 02, 2021 5:20 am
- Forum: Instrument Builders Forum
- Topic: Tear out
- Replies: 8
- Views: 6903
Re: Tear out
I drop fill with gluboost fill and finish. I wait to drop fill until after I have sealed the top, usually shellac for me. I could see drop filling with lacquer if lacquer is going to be used to finish the top. I find any wood fill always shows more. Sometimes even the matching bit of chip out, as th...
- Sat Jun 26, 2021 8:12 am
- Forum: Instrument Builders Forum
- Topic: Vacuum clamping bridges
- Replies: 20
- Views: 15148
Re: Vacuum clamping bridges
John, I do normally use a couple of 1/16" pins through the saddle slot. I tried replacing those with tapered wood pins that I think would have plugged the holes, but maybe not. I realize now that I never tried the clamp on the top with the pins in and no bridge. Should have done that.-Bob I specula...
- Thu Jun 24, 2021 8:25 am
- Forum: Instrument Builders Forum
- Topic: Vacuum clamping bridges
- Replies: 20
- Views: 15148
Re: Vacuum clamping bridges
John, I do have a reservoir on my system. The unit will quickly pull the air from a bag when I use it to veneer lap steels. When I stuck the LMI clamp on the back of an instrument, it would seal in about 20-30 seconds, shut off, and hold a vacuum. Just was not able to ever get it to shut off when u...
- Thu Jun 24, 2021 2:46 am
- Forum: Instrument Builders Forum
- Topic: Vacuum clamping bridges
- Replies: 20
- Views: 15148
Re: Vacuum clamping bridges
Vacuums are powerful things. How do you stop the guitar from imploding? Do you put in violin style sound pegs? The vacuum is not strong enough to rip through the top; it does pull the membrane down to the top. With regards to leaking the vacuum will pull air through the sound hole. If the guitar bo...
- Thu Jun 24, 2021 12:38 am
- Forum: Instrument Builders Forum
- Topic: Vacuum clamping bridges
- Replies: 20
- Views: 15148
Re: Vacuum clamping bridges
a sponge gasket on 2.x mm thick wood is not as air tight as a vacuum bag. So sure, the vacuum needs to be continuously applied. Setups with reservoirs will cycle on and off as a lot of the time the vacuum is maintained by the reservoir.
- Sun Jun 20, 2021 12:39 am
- Forum: Instrument Builders Forum
- Topic: Falcate Bracing question
- Replies: 3
- Views: 3513
Re: Falcate Bracing question
The CF tow for the primary braces passes under the bridge plate. The primary braces are clamped on to the tow during the open time of the epoxy used to glue down the tow.
- Thu Jun 10, 2021 11:54 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Is two better than one?
- Replies: 4
- Views: 4912
Re: Is two better than one?
I do not see a spectrum spike at 216 Hz. I am wondering if your back is pitched a bit below the top and the back is showing at 206 Hz and the top at 230 Hz. You can stick some mass on the top and/or the back (like blue tac) and see how the peaks move in relation to each other.
- Thu Jun 10, 2021 11:04 pm
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Is two better than one?
- Replies: 4
- Views: 4912
- Wed Jun 09, 2021 6:31 am
- Forum: Instrument Builders Forum
- Topic: Just completed first Flamenco Negra
- Replies: 4
- Views: 3524
Just completed first Flamenco Negra
I just completed my first Flamenco Negra. It has the flamenco sound, percussive a lot of separation while played, much less sustain than my classical guitars and easy to play very fast. Before starting the project I was not sure I knew what a Flamenco Negra was. I luckily got my hands on a couple of...
- Mon Jun 07, 2021 4:07 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Adjusting T(1,1)1
- Replies: 4
- Views: 10808
Re: Adjusting T(1,1)1
... Maybe a concern would be moving T(1,1)2 to too close to 185 Hz (F#) ? ... If you use the back to move T(1,1)1 you certainly will move the top down. If you wanted to experiment changing the size of the sound hole may be your best bet. If you want to reduce T(1,1)1 you need a smaller sound hole. ...
- Sun Jun 06, 2021 11:45 pm
- Forum: Instrument Builders Forum
- Topic: Shellac and other finish
- Replies: 4
- Views: 4148
Re: Shellac and other finish
I use Royal Lac, a modified shellac that is much more durable on some of my instrument. Using straight shellac I find that it takes about a month before the finish truly cures. Even longer if the finish is thick. Once cured shellac stands up to normal wear and tear.
- Sun Jun 06, 2021 4:14 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Adjusting T(1,1)1
- Replies: 4
- Views: 10808
Re: Adjusting T(1,1)1
Where are you in the build? My advise is only relevant if the numbers you listed are on a strung up guitar. My first thought is that unless you are chasing a wolf note on G#, you are in the range to just leave it as it is. With regard to the back braces you would have to really lower them before it ...
- Sun Jun 06, 2021 12:49 am
- Forum: Instrument Builders Forum
- Topic: 2 geets on the go
- Replies: 10
- Views: 13013
- Tue May 18, 2021 9:33 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: T(1,1,)3 Double Peak
- Replies: 4
- Views: 5289
Re: T(1,1,)3 Double Peak
One of the double poles may be another top mode like the cross dipole. The first of the double is probably your back.
- Sun May 09, 2021 2:40 am
- Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
- Topic: Confused about frequency response in my first TG style falcate
- Replies: 20
- Views: 25490
Re: Confused about frequency response in my first TG style falcate
... Just adding the mass of the strings can make quite a difference which people often put down to loading the soundboard with string tension, when I usually find that the change can be accounted for by the added mass. ... Interesting, I do test my steel string guitars with pins and saddle both bef...