Search found 23 matches

by Mitch Lees
Mon Sep 02, 2019 12:12 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Top Edge Thinning - Measurement of Thickness
Replies: 3
Views: 227

Re: Top Edge Thinning - Measurement of Thickness

Sorry to labour this issue, but others may find it interesting. I have done the thinning, and in doing so I have learned a few things. First, experience does not always help - I have made a couple of arch-top jazz guitars and carving the re-curve at the edge of the soundboard leaves the outside edge...
by Mitch Lees
Sun Sep 01, 2019 5:32 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Top Edge Thinning - Measurement of Thickness
Replies: 3
Views: 227

Re: Top Edge Thinning - Measurement of Thickness

Further to my previous post. I was thinking about this (in the middle of the night!) and I have decided not to buy the magnetic device. I will just thin to a target frequency rather then an actual thickness, and use my judgement to ensure I do not thin too much. My 'out of the mould' frequencies are...
by Mitch Lees
Sun Sep 01, 2019 1:07 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Top Edge Thinning - Measurement of Thickness
Replies: 3
Views: 227

Top Edge Thinning - Measurement of Thickness

I have thinned the outer edges of the tops of my previous guitars, but this has been done by guess-work alone using scrapers. I do have a good metal thickness caliper which is fine for measuring the unattached plates, but it will not go through the sound hole of the completed box. I am building a Me...
by Mitch Lees
Tue Aug 06, 2019 8:59 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Practical degreee of accuracy thicknessing panels
Replies: 2
Views: 316

Re: Practical degreee of accuracy thicknessing panels

I find it quite difficult to level my Jet drum sander to better than .2 to .3 mm. Usually one end or the other is just slightly high (more often the motor end). Reversing the feed of the boards each pass helps, but usually I find .1 or .2 variation. I note the high side and take just a little more o...
by Mitch Lees
Tue Aug 06, 2019 3:47 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Wallnut Density for SS Falcate Bridge
Replies: 4
Views: 390

Re: Wallnut Density for SS Falcate Bridge

Thanks Trevor,

I have found another piece in the wood shed. It comes in at 556 which is nearer the mark. Not as tight grained as the previous one, and just off quarter, but I will make another bridge today and see if I can get under 20 grams.

Regards
Mitch
by Mitch Lees
Tue Aug 06, 2019 12:38 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Wallnut Density for SS Falcate Bridge
Replies: 4
Views: 390

Wallnut Density for SS Falcate Bridge

I am building a SS 12 Fret Falcate as per the book and plans - contemporary bridge design exactly as Vol 2 Fig 20-3. Trying to get the bridge weight below 20gms. So far have only achieved 23 gms. I have yet to shape the bottom to fit the guitar top, but this will only require about .5mm to be remove...
by Mitch Lees
Wed May 08, 2019 7:39 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Cutting The Neck Tenon With a Table Saw
Replies: 6
Views: 1398

Re: Cutting The Neck Tenon With a Table Saw

Martin,

Thanks for the reply. Presumably you set the blade angle to plus and then minus 5 degrees - I see this OK, but how do you get the 1 degree back angle - do you use the table saw?

Mitch
by Mitch Lees
Wed May 08, 2019 5:41 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Cutting The Neck Tenon With a Table Saw
Replies: 6
Views: 1398

Cutting The Neck Tenon With a Table Saw

I am making a 12 Fret Falcate Steel String as per the plans. I would like to use my table saw rather than the band saw to cut the neck tenon as it mentions in Book 2 that this is the more accurate method, and hopefully it also means I will have less fitting to do on the shoulders to achieve the corr...
by Mitch Lees
Wed Mar 27, 2019 10:47 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Wood for Falcate Braces in UK
Replies: 12
Views: 1942

Re: Wood for Falcate Braces in UK

Thanks all for going to the trouble.

This will be a great help - particularly the pics

Mitch
by Mitch Lees
Mon Mar 25, 2019 2:03 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Wood for Falcate Braces in UK
Replies: 12
Views: 1942

Re: Wood for Falcate Braces in UK

Thank you for your responses. It seems the spruce I have been trying to use was of the 'will not bend without breaking' variety. Because of this very limited experience, I had assumed all spruce was like this. However, I have another batch of spruce brace wood which I will now try - hopefully it wil...
by Mitch Lees
Fri Mar 22, 2019 7:14 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Wood for Falcate Braces in UK
Replies: 12
Views: 1942

Wood for Falcate Braces in UK

This a question for UK-based members. I am building my first falcate braced steel string as per the plans from the 'books'. Which wood have you used for the braces, and where have you sourced it please? My preliminary experiments with the Sitka and European Spruce I have to hand have not gone well! ...
by Mitch Lees
Sat Feb 23, 2019 6:47 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: To Add Side Weight or Not?
Replies: 2
Views: 801

Re: To Add Side Weight or Not?

Thank you Trevor. I will wait until the instrument is strung up to make a final decision. However, I suppose the good thing about having built-in weight attachment points is that the decision does not have to be 'final'.

Mitch
by Mitch Lees
Sat Feb 23, 2019 1:39 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: To Add Side Weight or Not?
Replies: 2
Views: 801

To Add Side Weight or Not?

I have attached the bridge to my current traditional classical build (Hauser type), and recorded a spectrum which has left me with a bit of a dilemma. By chance (!) the 2 major resonances fall nicely between scale notes: the first air resonance at 102hz falls between G and G sharp and the coupled to...
by Mitch Lees
Thu Aug 16, 2018 2:10 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Carbon Fibre Thickness for Bridge
Replies: 1
Views: 1120

Carbon Fibre Thickness for Bridge

I am making a contemporary classical walnut bridge. I intend to use 2 layers of carbon fibre cloth which is .5mm thick - is this OK or does the cloth need to be thicker to give the correct amount of stiffness? Assuming .5mm is OK - and the walnut slices are 2,3, and 4mm then the bridge blank will be...
by Mitch Lees
Mon Jun 25, 2018 11:49 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Mass Support Block - Positioning
Replies: 4
Views: 1874

Re: Mass Support Block - Positioning

Trevor,

Thank you, I will get on and design my blocks now.

Mitch
by Mitch Lees
Mon Jun 25, 2018 6:22 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Mass Support Block - Positioning
Replies: 4
Views: 1874

Mass Support Block - Positioning

I make my guitars with modified side splints to house magnets which mate with similar magnets on a knee support. The support I use is a modified Ergo Play (magnets instead of suckers): it has 3 attachment points and hence 3 magnets - 2 on the upper bout and 1 on the lower bout. For the first time I ...
by Mitch Lees
Sat Feb 10, 2018 7:07 pm
Forum: Instrument Builders Forum
Topic: Bowed Back board
Replies: 13
Views: 3800

Re: Bowed Back board

Did you by any chance take a note of the humidity level when the braces were glued and what it was when you noticed the radius reversal?

Mitch
by Mitch Lees
Sat Jan 27, 2018 9:03 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: The Right Microphone?
Replies: 9
Views: 3022

Re: The Right Microphone?

Thanks for the help guys.

Mitch
by Mitch Lees
Fri Jan 26, 2018 5:09 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: The Right Microphone?
Replies: 9
Views: 3022

Re: The Right Microphone?

Kym,

Are you talking about more then an XLR to mini jack adaptor?

Mitch
by Mitch Lees
Thu Jan 25, 2018 5:19 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: The Right Microphone?
Replies: 9
Views: 3022

The Right Microphone?

I have all my spread sheets (except the 4DOF model - struggling with that), my jigs, speaker, software and poppy seeds! So now I just need to buy a microphone. I was just about to get a Shure SM58, but I have been talking to a studio engineer, and he tells me that (in the price range) the Shure is a...
by Mitch Lees
Thu Jan 18, 2018 12:17 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Along and Across Grain Stiffness Ratio
Replies: 3
Views: 1928

Re: Along and Across Grain Stiffness Ratio

Trevor,

Thank you again for your time. Glad I have been through the 'spreadsheet process' it helped a lot with gaining a more detailed understanding of the relationship of the various equations, and being able to do more with Excel will be useful in the future.

Regards

Mitch
by Mitch Lees
Mon Jan 15, 2018 7:54 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Along and Across Grain Stiffness Ratio
Replies: 3
Views: 1928

Along and Across Grain Stiffness Ratio

This is my first post and so I thought I had better introduce myself. I am an amateur guitar maker living in Findhorn in northern Scotland. I have 3 classical and 3 steel string (plus a number of electrics) to my name, built mainly using the Bogdanovich, Cumpiano methods. I am quite pleased with the...