Search found 1507 matches

by jeffhigh
Fri Mar 24, 2017 7:30 am
Forum: Instrument Builders Forum
Topic: Jigs - Are they worth it?
Replies: 11
Views: 14901

Re: Jigs - Are they worth it?

Jigs and templates etc save you ruining the part you may have already put several hours work into.
by jeffhigh
Fri Mar 24, 2017 7:26 am
Forum: Instrument Builders Forum
Topic: Dry Climate Build Schedule
Replies: 21
Views: 19402

Re: Dry Climate Build Schedule

Gluing the soundboard and back onto the rims is the other operation to do at low RH
by jeffhigh
Tue Feb 28, 2017 7:38 pm
Forum: Instrument Builders Forum
Topic: Break Angle at the Saddle
Replies: 12
Views: 14007

Re: Break Angle at the Saddle

When analysing the torque on the bridge, you can basically assume that the string is pulling to the left at the top of the saddle and the rest of the string, saddle and bridge acts as one with the connection to the soundboard providing resistance to the bridge rotation hence T x saddle height is the...
by jeffhigh
Tue Feb 28, 2017 8:17 am
Forum: Instrument Builders Forum
Topic: Break Angle at the Saddle
Replies: 12
Views: 14007

Re: Break Angle at the Saddle

Torque is pretty simple
For static torque of the bridge on the soundboard it is just saddle height above the soundboard in metres by string tension in Newtons.
As far as the tension change signal it is just a much smaller plus and minus force superimposed on the static string tension
by jeffhigh
Tue Feb 28, 2017 6:47 am
Forum: Instrument Builders Forum
Topic: Break Angle at the Saddle
Replies: 12
Views: 14007

Re: Break Angle at the Saddle

I'm not sure why you have halved the angle, and I think you have transposed sine and cos, but it could be me being rusty on this. There are a few other problems with the calcs too But the major problem is that these are static forces not the signal forces The key issues to understand are that -these...
by jeffhigh
Mon Feb 27, 2017 8:09 am
Forum: Instrument Builders Forum
Topic: Break Angle at the Saddle
Replies: 12
Views: 14007

Re: Break Angle at the Saddle

The vibration from the string is transmitted to the soundboard in two ways Firstly, and the major sound producer is transverse to the string, which drives the soundboard in and out. Secondly and with much less energy and at twice the frequency is the tension change signal. This is the one which rock...
by jeffhigh
Mon Feb 27, 2017 6:21 am
Forum: Instrument Builders Forum
Topic: Break Angle at the Saddle
Replies: 12
Views: 14007

Re: Break Angle at the Saddle

I The string tension exerts and downwards (and forwards) pressure on the saddle, I will call this the Resultant! The bigger the Resultant the more energy that gets driven into the saddle and then the soundboard. Would anyone like to go through my sums and see if I am thinking correctly? This is the...
by jeffhigh
Sat Feb 04, 2017 12:20 pm
Forum: Instrument Builders Forum
Topic: Bottle slide setup
Replies: 7
Views: 7742

Re: Bottle slide setup

It depends on his style of playing. Does he combine fretted notes with slide notes? Many players do and if this is the case you will not want a greatly increased action. I would not replace the nut, all that would possibly be needed would be to raise the saddle and maybe install a slightly higher se...
by jeffhigh
Sat Jan 21, 2017 10:31 am
Forum: Instrument Builders Forum
Topic: Removable Back
Replies: 10
Views: 9673

Re: Removable Back

Brian Burns, a very experienced USA classical and flamenco builder uses the taped on back on all his builds in the process of tuning.
Some form of tie between neckblock and tailblock may be needed on a steelstring.
by jeffhigh
Mon Dec 19, 2016 10:03 am
Forum: Instrument Builders Forum
Topic: Not dead - Just Busy
Replies: 14
Views: 17445

Re: Not dead - Just Busy

This came home with me yesterday
1993 BMW R1100RS

Image
by jeffhigh
Sat Dec 10, 2016 6:25 pm
Forum: Instrument Builders Forum
Topic: Articulated string pull
Replies: 6
Views: 9412

Re: Articulated string pull

You are right Deems that there is still an angle depending on how you look at it. In practice though that extra lateral deviation, on top of the headstock angle does make a difference. For example, the classic Gibson les Paul with a 17 degree headstock angle plus widely spread D and G strings is not...
by jeffhigh
Fri Dec 09, 2016 6:01 pm
Forum: Instrument Builders Forum
Topic: Articulated string pull
Replies: 6
Views: 9412

Re: Articulated string pull

The straight string pull from tuner though nut is not exactly about "better intonation" The idea is that it improves tuning by allowing the string to run freely through the nut slot. So the string doesn't stick in the slot after a big bend and the string goes flat. And tuning up gives instant result...
by jeffhigh
Sun Dec 04, 2016 6:48 pm
Forum: The Gallery
Topic: "Rose Cliche"
Replies: 12
Views: 17623

Re: "Rose Cliche"

The guitar sounds great also a very impressive voice
by jeffhigh
Wed Nov 23, 2016 6:01 am
Forum: Instrument Builders Forum
Topic: Clear lacquer over French polished surface ??
Replies: 6
Views: 7975

Re: Clear lacquer over French polished surface ??

I had a 56 Jag Mk8 a few years back The original finish would have been Nitro lacquer which did not stand up well to exposure to the Australian sun. I used acrylic lacquer in refinishing mine. I think putting lacquer over the FP would be a retrograde step but if I had to, I'd probably remove any sur...
by jeffhigh
Tue Nov 08, 2016 1:26 pm
Forum: Instrument Builders Forum
Topic: Dremel or trimmer
Replies: 18
Views: 18102

Re: Dremel or trimmer

I was using a dremel on the SM base, attached to the SM circle cutter for rosettes. I was never really happy with it. I modified the SM circle cutter to take a trimmer base and use the trimmer with 1/4" to 1/8 adapter for rosettes. Much better results due to the better bearings, rigidity, mass and p...
by jeffhigh
Tue Nov 08, 2016 6:13 am
Forum: Jigs & Fixtures
Topic: Lathe Drum sander
Replies: 6
Views: 28839

Re: Lathe Drum sander

Yes, Unless the lathe has a reverse setting you would need to feed in from the back.
by jeffhigh
Sat Nov 05, 2016 4:15 pm
Forum: Instrument Builders Forum
Topic: Creating the Headstock
Replies: 16
Views: 12814

Re: Creating the Headstock

Yep them or Gibsons with the huge truss rod nut pocket and 17 degree angle.
by jeffhigh
Sat Nov 05, 2016 4:04 pm
Forum: Instrument Builders Forum
Topic: Creating the Headstock
Replies: 16
Views: 12814

Re: Creating the Headstock

Well this one broke, but who knows why.
I think every joint has the potential for failure if it is abused enough or poorly glued.
Can't say that I see many failures in headstock location scarfs
by jeffhigh
Sat Nov 05, 2016 3:55 pm
Forum: Instrument Builders Forum
Topic: Most recent build
Replies: 16
Views: 17167

Re: Most recent build

Toot sweet
I put on 2Kg just listening to it
by jeffhigh
Sat Nov 05, 2016 3:45 pm
Forum: Instrument Builders Forum
Topic: Creating the Headstock
Replies: 16
Views: 12814

Re: Creating the Headstock

I'm sorry to tell you Max, but this is a fairly common variation. I have a 1963 Framus here ATM awaiting collection after I repaired a broken joint in this location. Its not a hard repair in this case because I was able to use hot hide glue as per original. You also see it in a lot of Asian factory ...
by jeffhigh
Sat Nov 05, 2016 8:35 am
Forum: Instrument Builders Forum
Topic: Is lutherie hard?
Replies: 20
Views: 20008

Re: Is lutherie hard?

“Is sex dirty? Only when it's being done right.”

― Woody Allen

Is lutherie hard?
by jeffhigh
Wed Nov 02, 2016 7:16 pm
Forum: Instrument Builders Forum
Topic: Building a go bar deck and radius boards on the cheap
Replies: 21
Views: 24922

Re: Building a go bar deck and radius boards on the cheap

I use them for just about everything including fitting soundboard and back to rims. I like the way you can just space them all along a brace at 40mm or so to get uniform pressure and do a complete bracing layout in one go. I use strips of merbau about 15X4 with a set of shorter lengths for closing t...
by jeffhigh
Tue Nov 01, 2016 5:22 pm
Forum: Instrument Builders Forum
Topic: ABG Headstock Thickness
Replies: 2
Views: 4883

Re: ABG Headstock Thickness

15-16mm is fine
That's what my factory electric basses use, and what I used on the one ABG I have made
by jeffhigh
Tue Nov 01, 2016 1:13 pm
Forum: Instrument Builders Forum
Topic: Falbo Intension Bridge
Replies: 92
Views: 93301

Re: Falbo Intension Bridge

Distance may equal delay
But you are so opposed to the long dipole because it has two out of phase areas,
Phase opposition represents a shift to one signal of half the wavelength which is not a constant time but dependant on the frequency, as opposed to the fixed delay found in comb filtering.
by jeffhigh
Tue Nov 01, 2016 9:17 am
Forum: Instrument Builders Forum
Topic: Falbo Intension Bridge
Replies: 92
Views: 93301

Re: Falbo Intension Bridge

So we know from the physics that the long and cross dipole have two antinodes that are 180 degrees out of phase with each other (this should also apply to the monopole cause the antinode in the middle of the board is out of phase with the rim or any part on the other side of the monopole node). So ...