Search found 1500 matches

by jeffhigh
Sun Aug 15, 2021 4:55 pm
Forum: Instrument Builders Forum
Topic: Hiding a repair
Replies: 11
Views: 862

Re: Hiding a repair

Or cover it with an apple sticker and claim it belonged to Daniel Johns of Silverchair (I worked on about 50 of his guitars and that was a common adornment)

But seriously, some sort of decorative inlay could look good rather than trying to disguise it.
by jeffhigh
Sat Jul 10, 2021 7:48 am
Forum: Instrument Builders Forum
Topic: Bendy ply
Replies: 3
Views: 533

Re: Bendy ply

You would end up with a lot of endgrain presented as a glue surface to the soundboard and back. Does not seem like a good idea.
by jeffhigh
Fri Jun 25, 2021 8:27 am
Forum: Instrument Builders Forum
Topic: Vacuum clamping bridges
Replies: 20
Views: 2137

Re: Vacuum clamping bridges

I use 2mm side dot material to pin the bridge for clamping. You can install these to the soundboard with CA protuding 2-3mm with the upper end tapered slightly, These will not leak with vacuum clamping.
by jeffhigh
Thu Apr 15, 2021 8:24 pm
Forum: Instrument Builders Forum
Topic: Paulownia Acoustic Top
Replies: 10
Views: 2263

Re: Paulownia Acoustic Top

Bear in mind that usage on traditional Japanese and Chinese instuments would be using a talipiece not a glued bridge and that does make a difference.
by jeffhigh
Sun Oct 04, 2020 11:27 am
Forum: Instrument Builders Forum
Topic: Classical Guitar Tuners Creaking and Binding Up
Replies: 13
Views: 5259

Re: Classical Guitar Tuners Creaking and Binding Up

Most builders avoid any products with silicones in the workshop due to the finishing and refinishing problems they can create
by jeffhigh
Tue Sep 15, 2020 1:03 pm
Forum: Instrument Builders Forum
Topic: Danelectro U2 plans?
Replies: 5
Views: 2539

Re: Danelectro U2 plans?

I used wood instead of Masonite for mine, and made a few mods to the original design like an adjustable truss rod, a shorter neck pocket and master vol and tone instead of concentric pots. But I used original style lipsicks and original (but steel not aluminium) bridge. I don't think of it in terms ...
by jeffhigh
Sat Sep 12, 2020 4:13 pm
Forum: Instrument Builders Forum
Topic: Danelectro U2 plans?
Replies: 5
Views: 2539

Re: Danelectro U2 plans?

I built a DC dano copy, no idea on the U2
Recommend NOT using Neptone pickups.
by jeffhigh
Sun Aug 30, 2020 8:32 am
Forum: Instrument Builders Forum
Topic: Saddle position
Replies: 31
Views: 9595

Re: Saddle position

The 5mm width on your saddle is unnecessary. If you go to 3mm you won't end up so close to the holes
by jeffhigh
Thu May 28, 2020 8:21 am
Forum: Instrument Builders Forum
Topic: The order of things ...
Replies: 14
Views: 6622

Re: The order of things ...

I drill the locating holes through the board into the neck then use plastic rod as pins only projecting 3mm from the face of the neck.
Then I can fret the whole board and just leave the pins in place.
Or I fret after gluing the board on, depends.
by jeffhigh
Mon Feb 17, 2020 10:57 am
Forum: Instrument Builders Forum
Topic: X-brace interfaces
Replies: 1
Views: 3533

Re: X-brace interfaces

Tapering down to 2mm at a butt joint between braces is essentially unconnected as far as any bending strength. What you are trying to avoid here is something like a full height butt joint which if it were to crack apart could buzz, Some older Martins connected finger braces and bridge plate to the X...
by jeffhigh
Tue Jan 21, 2020 5:56 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: compensation spreadsheet question
Replies: 5
Views: 5819

Re: compensation spreadsheet question

I had my copies of Trevors books stored away. I have pulled them out now. I'll note that the second paragraph of 4.7.3.1 indicates that the use of published values for the modus of steel are fine for steel strings, and only recommends the jig for use on Nylon or the like Classical strings I would su...
by jeffhigh
Tue Jan 21, 2020 10:32 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: compensation spreadsheet question
Replies: 5
Views: 5819

Re: compensation spreadsheet question

Are you trying to determine E from you test results? I don't see how?
It should be a constant around 190GPa as it is just a material property
Do you have a jig with pulley and weight to supply tension? The contant tension provided will not give meaningful compensation results Pictures?
by jeffhigh
Tue Jan 14, 2020 8:43 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: compensation spreadsheet question
Replies: 5
Views: 5819

Re: compensation spreadsheet question

Without getting too far into it and having to go back and check terminology etc, I suspect that your problem is that you have used the measured overall string diameter. For string longitudinal stiffness calculations, you need to use the measured core diameter excluding the wrap. The wrap contributes...
by jeffhigh
Sat Dec 14, 2019 5:11 pm
Forum: Instrument Builders Forum
Topic: Fibre Sheet for side lamination
Replies: 3
Views: 3426

Re: Fibre Sheet for side lamination

Fibre sheet would probably be quite damping too
by jeffhigh
Thu Dec 12, 2019 6:13 pm
Forum: Instrument Builders Forum
Topic: Study comparing FRC to subjective experience
Replies: 4
Views: 3715

Re: Study comparing FRC to subjective experience

It's a bit of a Straw man exercise
Put up a proposal that does not really represent anyones position then attempt to disprove it
I'll say worthless is being generous
by jeffhigh
Tue Dec 10, 2019 5:05 pm
Forum: Instrument Builders Forum
Topic: Study comparing FRC to subjective experience
Replies: 4
Views: 3715

Re: Study comparing FRC to subjective experience

Seems deeply flawed to me. To the extent of being worthless It puts up this hypothesis that percieved quality will be correlated with -the lower body frequencies being certain values (though not specified what is desirable) -the ratio of those frequencies not being 2.00 And then throws in a vast mix...
by jeffhigh
Fri Nov 15, 2019 12:03 pm
Forum: Instrument Builders Forum
Topic: Acoustic Bridge Types ...
Replies: 9
Views: 5222

Re: Acoustic Bridge Types ...

I have not made any for a while but definitely prefer the string through bridges for two reasons. - less stress on the glue joint than a tie bridge -better break angle I had to convert one factory uke to string through when lowering the saddle to get acceptable action left the strings sliding around...
by jeffhigh
Sun Sep 15, 2019 7:42 am
Forum: Instrument Builders Forum
Topic: Selmac Grand Bouche
Replies: 7
Views: 4674

Re: Selmac Grand Bouche

There should be, but often there is not.
I repaired a 70's grand Bouche can't remember the brand which was severely distorted around the soundhole resulting in very high action.
by jeffhigh
Sun Sep 15, 2019 7:30 am
Forum: Instrument Builders Forum
Topic: Selmac Grand Bouche
Replies: 7
Views: 4674

Re: Selmac Grand Bouche

There should be, but often there is not.
I repaired a 70's grand Bouche can't remember the brand which was severely distorted around the soundhole resulting in very high action.
by jeffhigh
Fri Jul 19, 2019 10:18 am
Forum: Instrument Builders Forum
Topic: Lefty Build
Replies: 5
Views: 4280

Re: Lefty Build

You would not want to wire audio taper pots in reverse. It would be useless.
You can get the Lefty Pots from these guys
https://www.realparts.com.au/left-hand-parts.html
by jeffhigh
Fri Jul 12, 2019 8:47 pm
Forum: Jigs & Fixtures
Topic: My dust collection system
Replies: 5
Views: 9907

Re: My dust collection system

Just out of curiosity, why two disc sanders?
by jeffhigh
Sat Jun 29, 2019 12:51 pm
Forum: Instrument Builders Forum
Topic: New acquisition. Southern Silky Oak.
Replies: 8
Views: 7494

Re: New acquisition. Southern Silky Oak.

And make sure any end grain is sealed well
by jeffhigh
Fri Jun 28, 2019 7:03 am
Forum: Instrument Builders Forum
Topic: New acquisition. Southern Silky Oak.
Replies: 8
Views: 7494

Re: New acquisition. Southern Silky Oak.

I have found it to move quite a lot with humidity changes (used in making small boxes)
It would not be my choice for neck timber.
by jeffhigh
Thu Jun 13, 2019 6:44 am
Forum: Instrument Builders Forum
Topic: travelling with several guitars?
Replies: 7
Views: 4527

Re: travelling with several guitars?

On an Archtop, I'd be taping the bridge in position and padding under the tailpiece
by jeffhigh
Mon Jun 10, 2019 8:08 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Gore method/Tap tune/Siminoff...help!
Replies: 16
Views: 11208

Re: Gore method/Tap tune/Siminoff...help!

IMHO forget Siminoff He is worse than useless because his principles and methods will lead you astray The Main aspects of the "Gore Method" are -materials testing by tap and then plate thickness calculation -Modal tuning where the finished guitar is tested and adjusted It does NOT tell you how to tr...