Search found 1483 matches

by jeffhigh
Sun Sep 15, 2019 7:42 am
Forum: Instrument Builders Forum
Topic: Selmac Grand Bouche
Replies: 7
Views: 231

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: 231

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: 1404

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: 4
Views: 1613

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: 2279

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: 2279

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: 1153

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: 13
Views: 1347

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...
by jeffhigh
Tue Jun 04, 2019 9:24 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Cutting The Neck Tenon With a Table Saw
Replies: 6
Views: 1380

Re: Cutting The Neck Tenon With a Table Saw

If I were doing this (and I am not, I use a different neck joint) I would be building a dedicated double sided sled with accurately positioned fences on both sides. Set it up with a 90 degree saw blade and a stop right across to the end of the tenon Use a shim at the headstock end to give the 5 degr...
by jeffhigh
Sat Apr 13, 2019 9:16 am
Forum: Instrument Builders Forum
Topic: Finishing advice - colour under oil??
Replies: 2
Views: 784

Re: Finishing advice - colour under oil??

I have used the Feast Watson Prooftint under wipe on poly on furniture without issue.
I would suspect that asking about compatability with oil is confusing people.
by jeffhigh
Wed Apr 10, 2019 6:00 pm
Forum: Instrument Builders Forum
Topic: Acoustical effect of back woods
Replies: 25
Views: 3961

Re: Acoustical effect of back woods

I agree with a lot of Peter Coombe's concerns about the methodology of this study. In addition -what the guitarist hears of the guitar is dependant on room acoustics - The fact that the guitarist hears the instrument as he is playing it means that they can make subtle adjustments to playing style to...
by jeffhigh
Sun Feb 24, 2019 10:50 am
Forum: Instrument Builders Forum
Topic: Twisted Ringed Gidgee
Replies: 2
Views: 797

Re: Twisted Ringed Gidgee

If the blank is overthick and oversize as they mostly are, cut it to length and width (to minimise the amount of twist you have to deal with) then flatten one side and use that as a base to thickness to final. The exact process will depend on what gear or machinery you have. Dealing with it this way...
by jeffhigh
Wed Feb 20, 2019 7:52 pm
Forum: Instrument Builders Forum
Topic: Old build, dead guitar
Replies: 7
Views: 1750

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: 1688

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: 1688

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: 1465

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: 3829

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: 4824

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: 2829

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: 1874

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: 6094

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: 4451

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: 3788

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: 3788

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: 3530

Re: Telealike.

And how do you install that neck pickup?