Search found 279 matches

by Dave M
Sun Mar 17, 2019 10:04 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: 3 piece pernambuco back
Replies: 9
Views: 1819

Re: 3 piece pernambuco back

John I like that you are doing a cutaway classical. I have decided that by default I will always do a cutaway since as a player it is so much nicer to use. As an aside, as you probably know Pernambuco is/was the favoured wood for violin bows. Usually looking darker than your sample. Stlll sticking w...
by Dave M
Sat Mar 16, 2019 2:51 am
Forum: Jigs & Fixtures
Topic: Tail Strip Glueing
Replies: 1
Views: 61

Tail Strip Glueing

I saw this idea somewhere but since I can't remember where I can't attribute it.

Since I was doing this job today I thought I would try it and it seems to work really well.

A means of holding the body and resist the push of a couple of go bars.
by Dave M
Fri Mar 08, 2019 4:20 am
Forum: Instrument Builders Forum
Topic: Weird finishing problem
Replies: 10
Views: 394

Re: Weird finishing problem

Wouldn't a couple of coats of shellac seal whatever the problem is?
by Dave M
Fri Mar 01, 2019 4:57 am
Forum: Instrument Builders Forum
Topic: What am I doing here?
Replies: 29
Views: 946

Re: What am I doing here?

This is a form of mandolin of course. There is an interesting chapter on it's development in Graham McDonald's book 'The Mandolin a History'

And those pipes are certainly more tuneful than the ones we normally see!
by Dave M
Thu Feb 21, 2019 3:19 am
Forum: Instrument Builders Forum
Topic: Old build, dead guitar
Replies: 4
Views: 455

Re: Old build, dead guitar

As Jeff said. The bridge rotation test in the book is very useful. It has pinpointed a classical that was overbuilt for me recently.


Dave
by Dave M
Wed Feb 06, 2019 10:32 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Falcate braces - radiusing?
Replies: 7
Views: 453

Re: Falcate braces - radiusing?

I haven’t done this but I guess you could check the situation by laying the falcate braces in the radiused/dished workboard and checking for gaps with feeler gauges.

As you have suggested any small gaps will be filled with the epoxy.

Cheers Dave
by Dave M
Wed Feb 06, 2019 4:17 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Falcate braces - radiusing?
Replies: 7
Views: 453

Re: Falcate braces - radiusing?

I take it you mean shaping the underside to fit the spherically arched top - as we do with the back braces. At some point, and it may have been in this forum rather than in the book, Trevor has stated that the braces will happily sit down into the curve even though they are flat. I guess this is due...
by Dave M
Thu Jan 24, 2019 3:41 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Steel String Chladni Patterns
Replies: 3
Views: 403

Re: Steel String Chladni Patterns

Well I can answer my own question having finally got round to doing a bridge rotation test. I have a very stiff top!

It is falcate braced and I thought it a pretty good, loud guitar with plenty of sustain, but maybe I haven't put it alongside a really responsive guitar.
by Dave M
Sat Jan 12, 2019 3:40 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Steel String Chladni Patterns
Replies: 3
Views: 403

Steel String Chladni Patterns

Most of my generating of Chladnis has been on classical guitars. I was testing a recently completed steel string and was having a bit of difficulty exciting the top. It struck me that perhaps the much stiffer top structure of the SS might need a lot more acoustic energy to get it going. Would people...
by Dave M
Tue Jan 01, 2019 3:21 am
Forum: Instrument Builders Forum
Topic: Some mandolin thoughts
Replies: 3
Views: 839

Re: Some mandolin thoughts

Peter that's very interesting. Trying to understand what is going on. Presumably the actual frequency of the back shouldn't matter because we are not hearing it. If the node line of the main top has moved outward presumably this would suggest an effect like Trevor's extra side mass...? Perhaps the e...
by Dave M
Sun Dec 23, 2018 10:16 pm
Forum: Instrument Builders Forum
Topic: Timber identification
Replies: 14
Views: 1807

Re: Timber identification

If it's not an Aus timber it looks an awful lot like Sapele. Dave
by Dave M
Thu Dec 20, 2018 8:58 am
Forum: Instrument Builders Forum
Topic: American Lutherie 118
Replies: 2
Views: 837

Re: American Lutherie 118

Nigel I did dig out that article thinking I might be able to scan and email it to you but it is far too big. Hopefully Martin or someone else local will be able to give you a copy. John Greven certainly has some interesting ideas on improving the efficiency of the building process. I was particularl...
by Dave M
Sun Dec 02, 2018 3:56 am
Forum: The Gallery
Topic: Figured Maple
Replies: 8
Views: 1217

Re: Figured Maple

Thanks Martin. I will be keeping the classical to do my terrible playing on since I have got rid of most of my others.
The SS I'll have to see if anyone is interested.
by Dave M
Sat Dec 01, 2018 3:01 am
Forum: Instrument Builders Forum
Topic: Neck angle
Replies: 11
Views: 1671

Re: Neck angle

And one might add that getting this geometry right is a pretty subtle process and remains one of the more difficult tasks for we beginners.
by Dave M
Sat Dec 01, 2018 2:55 am
Forum: The Gallery
Topic: Figured Maple
Replies: 8
Views: 1217

Re: Figured Maple

Thanks Fisherman. I didn't show them but my mitred purflings at the tail strip are gradually improving! And that is a good question. I keep thinking I should be doing some thinning but on this build I felt it was really such a light weight top that I didn't. It is Engelmann, taken to around 2.1 to 2...
by Dave M
Fri Nov 30, 2018 3:14 am
Forum: The Gallery
Topic: Figured Maple
Replies: 8
Views: 1217

Figured Maple

Drawing 1 small.jpg I haven't been too productive this year but have managed to finish these two which I am very pleased with. Fronts small.jpg One is a standard Trevor Falcate steel string. A design I keep going back to since it works so well. and the other is my Torres influenced classical. Yes I...
by Dave M
Tue Nov 27, 2018 10:21 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Starting out on J45
Replies: 29
Views: 4728

Re: Starting out on J45

I think there is a thing going on here which we toilers in our sheds all tend to suffer from. You really don’t have to own all the machines stroke tools that are needed. There is almost certainly another woodworker near you who actually has a morticing macihine and would happily let you use it for t...
by Dave M
Wed Nov 21, 2018 3:58 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Disharmony in SS Guitars
Replies: 3
Views: 669

Re: Disharmony in SS Guitars

This is it Trent:

https://www.youtube.com/watch?v=PO__iHHQyC0

It has a rather odd intro and outro but the playing is good
by Dave M
Sun Nov 18, 2018 11:06 pm
Forum: Instrument Builders Forum
Topic: Measuring and marking frets
Replies: 5
Views: 843

Re: Measuring and marking frets

Not quite what you asked but when marking out clamp your ruler to the board so you only zero it once, and use a magnifying glass of some sort (I have an illuminated magnifier) to help read the ruler. And don't get too worked up about it. The small errors here are probably not going to matter too much.
by Dave M
Fri Nov 16, 2018 9:44 am
Forum: Instrument Builders Forum
Topic: Donations drive to help cover forum running costs
Replies: 21
Views: 7558

Re: Donations drive to help cover forum running costs

Martin how are we doing on the funding front? Need a topup? Dave M
by Dave M
Fri Nov 16, 2018 9:40 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Disharmony in SS Guitars
Replies: 3
Views: 669

Disharmony in SS Guitars

This may seem a slightly odd place to put this query but bear with me. I am quite at ease with musicians playing classical style music on steel string guitars but I came across a really disturbing video tonight. I have huge respect for Michael Chapdelaine as a player but I listened to him playing Co...
by Dave M
Thu Nov 15, 2018 4:30 am
Forum: Instrument Builders Forum
Topic: Removing old shellac?
Replies: 8
Views: 1135

Re: Removing old shellac?

Pics Ross...?
by Dave M
Sun Nov 11, 2018 4:26 am
Forum: Instrument Builders Forum
Topic: 8 String bocote falcate braced nylon string crossover guitar
Replies: 17
Views: 2953

Re: 8 String bocote falcate braced nylon string crossover guitar

John that does look great. Your description of the ret top is also very timely. I have a falcate braced classical I completed a while ago that is seriously dull sounding. At some point I intend to re top with far less bracing - in fact the opposite of your job and I shall certainly try your technique.
by Dave M
Sun Nov 11, 2018 4:23 am
Forum: Instrument Builders Forum
Topic: Maple or Sycamore for purfling
Replies: 9
Views: 1281

Re: Maple or Sycamore for purfling

Thanks people. And Nigel I hadn't heard of gasket paper. I will have to get hold of some and try it out.
by Dave M
Thu Nov 08, 2018 8:31 am
Forum: Instrument Builders Forum
Topic: Maple or Sycamore for purfling
Replies: 9
Views: 1281

Maple or Sycamore for purfling

I am using (a quite dark brown) walnut for the first time for the body of a classical and want to use a simple white purfling that segments the back into two halves and continues under the binding which will be the same walnut as the back/sides. I had hoped to use some holly that I have in the rafte...