Search found 594 matches

by Dave M
Mon May 18, 2020 2:08 am
Forum: Instrument Builders Forum
Topic: Nozzle Size HVLP
Replies: 9
Views: 15443

Re: Nozzle Size HVLP

OK thanks people. It rather confirms my hunch that this really is not a subject that lends itself to hard and fast rules. Everyone has their own way of working and their own particular kit.

I'll keep working at it.

Dave
by Dave M
Sun May 17, 2020 2:24 am
Forum: The Gallery
Topic: A new classical mandolin
Replies: 9
Views: 10293

Re: A new classical mandolin

Graham that looks great.

I keep looking through your books and trying to decide if the next one will a mandolin but get seduced into another guitar!

Is this one a commission?

Cheers Dave
by Dave M
Tue May 12, 2020 7:12 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Reducing BOBO neck weight
Replies: 12
Views: 13853

Re: Reducing BOBO neck weight

So not much response, but I have often wondered about this pegs versus machine heads. What actually is the weight difference? Classical machine heads don't feel that heavy to me...? D
by Dave M
Tue May 12, 2020 7:08 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Bouchet Bracing Resonances
Replies: 2
Views: 5546

Bouchet Bracing Resonances

I was looking at Courtnall's drawing of one of Bouchet's bracing patterns and was very surprised at the height of the transverse brace under the bridge. It is stated as 14 mm high at the centre, though he doesn't say if it tapers much towards the edges. This is pretty substantial and I was wondering...
by Dave M
Sun May 10, 2020 5:46 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Reducing BOBO neck weight
Replies: 12
Views: 13853

Re: Reducing BOBO neck weight

Cutaways small.jpg Joss I was going to suggest exactly that. The BOBO design needs that large chunk of timber on the head block, and indeed two more bolts. As Martin says one has to alow for the bolt bar but the other thing is that when doing a cutaway it looks a bit silly to have a Spanish type he...
by Dave M
Wed May 06, 2020 8:45 am
Forum: Instrument Builders Forum
Topic: Bridge minimum gluing area
Replies: 3
Views: 4657

Re: Bridge minimum gluing area

Nah don’t listen to him!

Trevor Gore in the book suggests that a SS bridge should have a minimum footprint of 3750 mm squared but that doesn’t leave much room for intonation. Thus roughly 160 by 28 is about right.

I’m sure he knows what he’s talking about.

Cheers Dave
by Dave M
Wed May 06, 2020 8:25 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Trevor’s video by Robbie
Replies: 14
Views: 24995

Re: Trevor’s video by Robbie

Mm don’t think so Richard. If you go to his site and look at his list of online courses Trevor’s stuff is there. Something like guitar analysis etc. Seemed like quite a bit of money but I really learned a lot so am quite happy. It’s a great shame that nobody in the UK has been able to set up a sessi...
by Dave M
Wed May 06, 2020 2:57 am
Forum: Instrument Builders Forum
Topic: Very slow weissenborn wip
Replies: 22
Views: 27502

Re: Very slow weissenborn wip

Well done Steve. There is no better feeling than playing an instrument you have built entirely yourself is there?

Since you re obviously getting a grip on this stuff the next one will be much quicker...

Cheers Dave
by Dave M
Wed May 06, 2020 2:51 am
Forum: Instrument Builders Forum
Topic: Help reading flamenco tap tone data
Replies: 12
Views: 21677

Re: Help reading flamenco tap tone data

Joss, getting your head round section 2.3.7 could be useful. Trevor shows that you can often get the uncoupled back frequency by blocking the sound hole. This could possibly help to nail down the coupled back frequency if it is showing. By the way I would gently point out that these sorts of discuss...
by Dave M
Mon May 04, 2020 9:30 pm
Forum: Instrument Builders Forum
Topic: Help reading flamenco tap tone data
Replies: 12
Views: 21677

Re: Help reading flamenco tap tone data

Hi Joss, you've certainly been busy since that first build with Roy Courtnall! I won't comment on the resonant frequencies as there are people here much better qualified. There is quite a lot in the G&G book but I at least find it a bit hard to retain it all. One of the standout things is to avoid h...
by Dave M
Sun May 03, 2020 8:59 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Trevor’s video by Robbie
Replies: 14
Views: 24995

Re: Trevor’s video by Robbie

I can appreciate that John, I do not normally like video instruction but watching Trevor actually driving VA was really useful. I had missed many of the possibilities the software offers until I saw the screen shots of Trevor driving it. I’m sure this would be true for other areas in a live session....
by Dave M
Sat May 02, 2020 9:32 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Trevor’s video by Robbie
Replies: 14
Views: 24995

Trevor’s video by Robbie

I have just gone through the video published by Robbie O’Brien of Trevor going through the whole process of analysing a guitar’s responses. It is incredibly useful. It is not a criticism of the book to say that a video of many of the processes involved is very powerful. Words can only take you so fa...
by Dave M
Tue Apr 28, 2020 1:37 am
Forum: Instrument Builders Forum
Topic: Nozzle Size HVLP
Replies: 9
Views: 15443

Re: Nozzle Size HVLP

Thanks Allen that's got to be the next thing to try. Dave
by Dave M
Sun Apr 26, 2020 6:24 am
Forum: Instrument Builders Forum
Topic: Crazy times
Replies: 7
Views: 7527

Re: Crazy times

+1 for the opportunist!

We are the lucky ones with a workshop (well sorry Martin!) and an intense desire to create, so lockdown is not really so bad - I refuse to call it an opportunity but we can certainly find plenty to do.
by Dave M
Sun Apr 26, 2020 6:18 am
Forum: Instrument Builders Forum
Topic: Nozzle Size HVLP
Replies: 9
Views: 15443

Nozzle Size HVLP

I am finishing up a Falcate SS and struggling once again with orange peel in my nitro finish. I am using the 1.3 mm nozzle that came as standard with my Fuji system. However reading Jeff Jewitt's book he suggests that if thinning the lacquer doesn't work then going to a smaller nozzle might do it. W...
by Dave M
Tue Apr 07, 2020 1:18 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: having a go at spectrums
Replies: 11
Views: 14324

Re: having a go at spectrums

Simon I have had trouble getting to a satisfactory state on this. One issue is that you've got gain controls all over the place, on the preamp, on the PC sound card and on VA (at least). Even now I get better results on my desktop than a laptop, using the same (Shure) mic and USB preamp which I can'...
by Dave M
Tue Apr 07, 2020 12:58 am
Forum: Instrument Builders Forum
Topic: Classical Build (s) - Hopefully falcate!
Replies: 96
Views: 106096

Re: Classical Build (s) - Hopefully falcate!

Yup lots of those misshapen and broken plies. As Wayne says real care on the iron and one does get better. I still do 4 plies and sometimes you hit a spruce that simply won't go. Try a completely different batch.

Cheers Dave
by Dave M
Sun Apr 05, 2020 2:23 am
Forum: Instrument Builders Forum
Topic: Classical Build (s) - Hopefully falcate!
Replies: 96
Views: 106096

Re: Classical Build (s) - Hopefully falcate!

Richard yes I essentially used the SS layout with a little tweaking for the different body shape.

Dave M
by Dave M
Sat Apr 04, 2020 3:08 am
Forum: Instrument Builders Forum
Topic: Classical Build (s) - Hopefully falcate!
Replies: 96
Views: 106096

Re: Classical Build (s) - Hopefully falcate!

I always struggle bending spruce so use 4 laminations. Particularly the secondaries. It works fine
by Dave M
Sat Mar 14, 2020 4:35 am
Forum: Instrument Builders Forum
Topic: Double cutaway acoustic
Replies: 15
Views: 17230

Re: Double cutaway acoustic

That's come out pretty smart. Funnily enough it doesn't look as weird as one might expect!
It also seemed to go pretty quick.

Section 8...?
by Dave M
Wed Mar 11, 2020 3:37 am
Forum: Instrument Builders Forum
Topic: Somogyi bridge
Replies: 5
Views: 9145

Re: Somogyi bridge

Well yes I think we have to accept that Mr Somogyi doesn't operate in the same market as the rest of us but has entered the collectables realm. Price is no longer tied to functionality.

I do like the look of that bridge and it may also help in removing mass.
by Dave M
Sun Mar 08, 2020 11:05 am
Forum: Instrument Builders Forum
Topic: Somogyi bridge
Replies: 5
Views: 9145

Somogyi bridge

I was listening to Michael Chapdelaine playing a Somogyi guitar (which sounded great) and I noticed the little tails that he puts on the back of his bridges. I think they look great aesthetically. It may be a bit fanciful but I wondered if perhaps they had a function in terms of reducing the stress ...
by Dave M
Sat Feb 29, 2020 3:33 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Electronic setup
Replies: 4
Views: 8945

Re: Electronic setup

Clearly you can blow up speakers and there have been some reports on here. However although you do need a fair bit of power to bring up the Chladnis, you don't have to be too extreme. I have always felt the big risk is of dropping the speaker box on to the guitar! I keep meaning to suspend it with a...
by Dave M
Wed Feb 26, 2020 4:30 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Electronic setup
Replies: 4
Views: 8945

Re: Electronic setup

I simply use the signal generator in VA. Feed it through an old domestic amplifier, using the headphone output from the laptop. This drives a 4 inch car speaker which I have enclosed in a box. Works fine, the speaker was very cheap.

You will need ear protection!

Cheers Dave
by Dave M
Sun Feb 23, 2020 10:14 am
Forum: Instrument Builders Forum
Topic: Neck Carving
Replies: 6
Views: 8301

Re: Neck Carving

Mark thanks I am indeed doing what you suggest. It is that confidence thing about where the cutting line actually is as you mention. I also realised that one of the issues was that I am making a narrower neck - 45 mm rather than 47 at the nut, which doesn’t sound much but on the ground seems to make...