Search found 1471 matches

by jeffhigh
Wed Feb 20, 2019 7:52 pm
Forum: Instrument Builders Forum
Topic: Old build, dead guitar
Replies: 3
Views: 171

Re: Old build, dead guitar

The guitar may just be overbuilt with a top which is too heavy and stiff.
You can't really tell just from a tap spectrum unfortunately, and tapping the back is fairly irrelevant.
You would need to do the deflection testing and uncoupled testing tap testing.
by jeffhigh
Wed Feb 20, 2019 7:21 pm
Forum: Instrument Builders Forum
Topic: Testing existing top and back
Replies: 9
Views: 473

Re: Testing existing top and back

I'd suggest you just use the existing top and back at current thicknesses, brace and assemble and then test. You can always thin the plates in situ. The results from static testing of a shaped back and top are going to be suspect and can't just be rectified my averaging the width as suggested. For o...
by jeffhigh
Wed Feb 13, 2019 8:20 am
Forum: Instrument Builders Forum
Topic: Testing existing top and back
Replies: 9
Views: 473

Re: Testing existing top and back

If you are testing "existing top and back" disassembled from the body as your title implies, all the regular material testing methods will not work since they rely on using rectangular uniform pieces.
by jeffhigh
Wed Feb 13, 2019 8:09 am
Forum: Instrument Builders Forum
Topic: Homemade fret/fingerboard leveller
Replies: 5
Views: 572

Re: Homemade fret/fingerboard leveller

IMHO length is vital,
A 16" beam with 320 grit is far superior to a shorter file, even if you get a good one.
by jeffhigh
Wed Nov 21, 2018 5:06 pm
Forum: Instrument Builders Forum
Topic: Interesting intonation problems with two small high-performance guitars I just completed
Replies: 18
Views: 1606

Re: Interesting intonation problems with two small high-performance guitars I just completed

A few comments, When testing for body, top and back, forget about plugging the soundhole, it's the open soundhole frequencies and only from tapping at the bridge that matter and these are the ones which can put off notes nearby. In the Gore method, the plugged soundhole results are only used for mon...
by jeffhigh
Fri Jul 27, 2018 4:23 pm
Forum: Instrument Builders Forum
Topic: Routing bindings/purflings
Replies: 24
Views: 2801

Re: Routing bindings/purflings

I've used hand held like the luthier tools one with adjustable depth of cut I then mounted it on a drawer slide aparatus and mounted the body on a cradle Then I went to a Gore /Gillet style and used a stewmac bit and bearings. The last is, IMHO overwhelmingly the best. I climb cut as per the stewmac...
by jeffhigh
Thu Jun 21, 2018 6:13 am
Forum: Instrument Builders Forum
Topic: "Dying" craft & radial soundboard
Replies: 6
Views: 1690

Re: "Dying" craft & radial soundboard

Looks like he is basically making dobros or banjos with a wooden soundboard instead of a metal cone/skin head.
I'm not to impressed with his dismissal of the rest of the luthiery world, though perhaps that is a product of editing down to a short clip
by jeffhigh
Mon Jun 18, 2018 8:51 am
Forum: Instrument Builders Forum
Topic: Need E4 string for 500 mm length.
Replies: 6
Views: 1153

Re: Need E4 string for 500 mm length.

If you really need to get down to 10lbs tension, then a 16 is going to be too thick A standard guitar scale is 650mm more or less so a 500 scale length would end up midway between the 4th and 5th fret. 5th fret on the second B string is E, so selecting a guitar B string with a 10lb tension will get ...
by jeffhigh
Wed May 09, 2018 5:36 am
Forum: Instrument Builders Forum
Topic: bandsaw opinions
Replies: 20
Views: 3533

Re: bandsaw opinions

As for specs. I want something versatile with a big table and cuts accurately. Uses will be guitars and general woodworking like cabs for amps and speakers and household projects. For everything except the guitar work you are better served with some sort of table saw and a drop saw. The throat widt...
by jeffhigh
Mon Mar 26, 2018 5:47 am
Forum: Instrument Builders Forum
Topic: Soundboard gluing failure
Replies: 19
Views: 2926

Re: Soundboard gluing failure

Routing and inlaying like that will leave a vulnerable area at each edge of the channel.
Best to just add reinforcement on the surface.
by jeffhigh
Wed Feb 28, 2018 6:01 am
Forum: Instrument Builders Forum
Topic: Bowed Back board
Replies: 13
Views: 2615

Re: Bowed Back board

Cracked the issue. It was a humidity problem! Not the back board itself but the bracing, I had mistakenly used spruce kept in the workshop overnight rather than fresh from the house. Once removed the board sprang back to shape the the bracings turned to bananas. Thanks for all you help guys. Unlike...
by jeffhigh
Tue Feb 20, 2018 5:55 am
Forum: Instrument Builders Forum
Topic: Bowed Back board
Replies: 13
Views: 2615

Re: Bowed Back board

I would very much doubt that the sourcing from spain has anything to do with it. You are doing yourself a disservice if you put the problem down to this. At 2-3mm timber acclimatises very quickly, 3 months is plenty 55% RH is pretty much the top of the range for bracing, most are aiming for 45 or lo...
by jeffhigh
Wed Jan 24, 2018 9:18 am
Forum: The Gallery
Topic: Telealike.
Replies: 8
Views: 2393

Re: Telealike.

And how do you install that neck pickup?
by jeffhigh
Sun Jan 07, 2018 11:13 am
Forum: Instrument Builders Forum
Topic: I stuffed up putting frets in a new neck I made - Is it salvageable?
Replies: 11
Views: 2012

Re: I stuffed up putting frets in a new neck I made - Is it salvageable?

I'd be pulling the frets, get them too hot to comfortably touch with a soldering iron first, then the CA will release. What do you mean by "a 12" compound radius". If you truly have a compound radius, matching fret press cauls to the board radius all the way is difficult. Using the hammer is fine, b...
by jeffhigh
Wed Nov 29, 2017 6:03 am
Forum: Instrument Builders Forum
Topic: Tru Oil alternatives
Replies: 16
Views: 5374

Re: Tru Oil alternatives

Just pay the $15 a bottle. I might seem better to buy larger quantities, but once the bottle is opened, it starts going off, so you are better with the fresh small bottle which is plenty for a guitar. I have a bottle of Aussie oil but have not used it yet. The difference between tru oil and many of ...
by jeffhigh
Mon Oct 23, 2017 8:50 am
Forum: Instrument Builders Forum
Topic: Skill sets.
Replies: 15
Views: 4636

Re: Skill sets.

Geometry,
Too many guitars from individual builders and established factories come with neck angles that prevent proper setup.
by jeffhigh
Wed Oct 18, 2017 10:52 am
Forum: Instrument Builders Forum
Topic: 'Old' shellac flakes
Replies: 6
Views: 1915

Re: 'Old' shellac flakes

Button lac is generally less refined and contains wax and has less surface area to oxidise? than flakes.
Dewaxed blonde flakes have the shortest shelf life.
by jeffhigh
Thu Oct 05, 2017 10:48 am
Forum: Instrument Builders Forum
Topic: Bridge Thickness different on Bass to Treble
Replies: 4
Views: 1372

Re: Bridge Thickness different on Bass to Treble

On some brands, such as Martin, the bridge pins are quite close to the saddle, especially on the bass side, so having the extra support from a thicker bridge and the resultant lower protrusion, can be beneficial for the increased sideways load.
by jeffhigh
Mon Oct 02, 2017 8:38 am
Forum: Instrument Builders Forum
Topic: Block grain direction
Replies: 9
Views: 2803

Re: Block grain direction

One issue with using blocks with grain perpendicular to the sides, is that you end up gluing endgrain to the soundboard and to the back.
I tend to laminate blocks myself, with vertical grain to the inside to resist splitting.
by jeffhigh
Mon Sep 25, 2017 4:59 pm
Forum: Instrument Builders Forum
Topic: To kerf or not to kerf - that is the question.
Replies: 1
Views: 1039

Re: To kerf or not to kerf - that is the question.

Some people use the solid lining for the back to sides joint because the consider it to look better though the soundhole. The soundboard to sides joint which is not seen, may use kerfed lining or individual blocks.(especially if building spanish style on a solera) The Trevor Gore method is the oppos...
by jeffhigh
Mon Sep 25, 2017 8:21 am
Forum: Instrument Builders Forum
Topic: Broken headstock
Replies: 8
Views: 2875

Re: Broken headstock

From the photo, It would be a repair I would do with Hot Hide Glue, no splines, after scrubbing out with hot water and a stiff brush to remove any glue residue. HHG is more resistant to warm weather (guitar in car Boot) Epoxy is not a cureall in this situation. in particular a starved joint due to a...
by jeffhigh
Tue Sep 12, 2017 11:45 am
Forum: Instrument Builders Forum
Topic: Can someone please explain neck-body alignment to a newby?
Replies: 6
Views: 2623

Re: Can someone please explain neck-body alignment to a newby?

Hi Richard, I would encourage you to develop your understanding of the geometry involved. Firstly note that a 25' radius top will have greater curvature than a 33' not less It is worth looking beyond the rules of thumb and developing an understanding of the effects of neck angle. fretboard thickness...
by jeffhigh
Tue Sep 05, 2017 6:55 pm
Forum: Instrument Builders Forum
Topic: laminated plates
Replies: 12
Views: 3491

Re: laminated plates

Not questioning the idea of laminating your own plates Rod, Just wheter the use of nomex is worth it.
by jeffhigh
Mon Sep 04, 2017 8:15 am
Forum: Instrument Builders Forum
Topic: laminated plates
Replies: 12
Views: 3491

Re: laminated plates

Rod, I have no personal experience with Nomex, I looked into it a while back and decided it was not for me. What are you expecting to achieve from laminating in Nomex? As far as I could tell it is basically not a really stiff material just providing a lightweight separation layer so that you can end...
by jeffhigh
Sun Aug 13, 2017 9:56 am
Forum: Instrument Builders Forum
Topic: UV cure resin.
Replies: 2
Views: 1370

Re: UV cure resin.

I have not used it, but would expect that you would not get UV penetration through the veneer, let alone any bleed fabrics.
A lot of the early users of UV cure finishes found that the first coat on timber was penetrating too deep for the UV to reach and cure.