New Koa and Spruce

Construction and repair of Classical Guitar and related instruments
dbeau

Re: New Koa and Spruce

Post by dbeau » Tue Jul 15, 2014 1:30 am

PETER,
It was great of you to show this and it certainly informs and raises the esteem for luthiery, at which you excel.
It also deepens the appreciation for my guitar, #115.
Thanks, Dave

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Doug Ingram
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Re: New Koa and Spruce

Post by Doug Ingram » Tue Jul 15, 2014 3:11 am

Thanks for sharing, Peter. I always love seeing how others build!

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Leonardo Orsi
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Re: New Koa and Spruce

Post by Leonardo Orsi » Tue Jul 15, 2014 3:50 am

Peter Oberg wrote: This shot shows the neck block with its pad that increases the support under the fingerboard. You can also see how wide the combination of double sides and linings ended up.
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Dear Peter,

I am loving this post. Your crafstmanship is stunning.

These are the details I liked most, the wide block under the fretboard and the wide laminated sides. I d loved a laminated back, too.

Also, that squared ramps in the peghead are perfect.

Thanks for sharing.

Leonardo
"There is no 'talent' or special condition. The real things that makes us better are the effort, the hard work, and the intelligence of focusing it on the right direction"

Marcus Dominelli
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Re: New Koa and Spruce

Post by Marcus Dominelli » Tue Jul 15, 2014 2:16 pm

Hi Peter,
I really like your approach to the assembly process, not to mention the clean workmanship.
What are the linings - maple?
-Marcus

iim7V7IM7
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Re: New Koa and Spruce

Post by iim7V7IM7 » Tue Jul 15, 2014 2:27 pm

Marcus Dominelli wrote:Hi Peter,
I really like your approach to the assembly process, not to mention the clean workmanship.
What are the linings - maple?
-Marcus
Could be the photos, but I see a "greenish" tone in the linings. Poplar?
2015 - John Buscarino, 650 mm, Carpathian Spruce/Honduran Rosewood
2014 - Peter Oberg, 640 mm, Western Red Cedar/Black Cherry

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Peter Oberg
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Re: New Koa and Spruce

Post by Peter Oberg » Tue Jul 15, 2014 4:31 pm

Thanks to everyone for the kind comments. I think the mass under the fingerboard helps the notes above the 12th fret, but I have no way of proving it. The pad pretty much butts to the large upper cross brace, but there are no other braces on the top in that area.
The linings are poplar. It's really inexpensive, bends easily, and you can buy these beautiful large flat sawn boards and adjust how you mill the pieces to end up with quartersawn linings. I gang bend them, then rout a profiled edge before gluing to the body.
p

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Doug Ingram
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Re: New Koa and Spruce

Post by Doug Ingram » Tue Jul 15, 2014 6:14 pm

A friend of mine, who runs a portable mill, tells me that it is very difficult to sell Poplar, whoever, selling Aspen is very easy. Aspen is much more desirable than Poplar!

It is, however, the same wood, as we all know.

Reading that it works so well for you, Peter, I', ready to give it a try.

TomS

Re: New Koa and Spruce

Post by TomS » Tue Jul 15, 2014 11:52 pm

I built a large bookcase for my living room from poplar, low cost, stable and wonderful to work with. :)

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Peter Oberg
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Re: New Koa and Spruce

Post by Peter Oberg » Wed Jul 16, 2014 2:57 am

Doug Ingram wrote:A friend of mine, who runs a portable mill, tells me that it is very difficult to sell Poplar, whoever, selling Aspen is very easy. Aspen is much more desirable than Poplar!

It is, however, the same wood, as we all know.

Reading that it works so well for you, Peter, I', ready to give it a try.
I don't think you will regret it Doug. I have used a lot of different woods for linings but poplar is my favorite. One of the two makers whose shop I worked in when I was coming up used Alder, which is another inexpensive alternative. I found it to be a little stringy when bending-poplar bends like butter and has none of that stringy quality.

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Peter Oberg
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Re: New Koa and Spruce

Post by Peter Oberg » Wed Jul 16, 2014 3:19 am

Nothing like the smell of Deft in the morning.
Image

I do the same to the top before routing for bindings.
Image

This is the fixture for routing the channel for the back strip. I have a dedicated router for this, so the setup is always the same.
Image

The back strip and butt strip are in, and you can see the single binding/purfling ledge I rout.
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Mitering the purfling on the back strip.
Image

Bound and gagged. No talking until later on.
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Back strip, butt strip, and binding converging.
Image

Fitting the top binding and purfling. I run the purfling by a little-I find it easier to get an invisible joint if it's staggered from the binding joint.
Image

Rosette is now flooded with thin super glue.
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This is the fixture for scraping the bindings and back strip flush. The cut C-clamp at the bottom traps the body between two shaped pieces, then the four wedges support the body so
I can use plenty of pressure when scraping.
Image

The finished bindings, which have not been rounded over yet.
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Necks in various stages of completion. The far right one is for an all POC guitar which I hope to finish before 2020.
Image

riffmeister
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Re: New Koa and Spruce

Post by riffmeister » Wed Jul 16, 2014 4:25 am

Looking good!

What is Koa like on the back and sides, sound-wise?

iim7V7IM7
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Re: New Koa and Spruce

Post by iim7V7IM7 » Wed Jul 16, 2014 9:33 am

This is the first "classical" build thread that I have seen (I have seen many steel string, gypsy & archtop). The craft is of course familiar but the structure is not. Thanks for taking the time to let us into some vignettes into your mind and shop.

Appreciated
2015 - John Buscarino, 650 mm, Carpathian Spruce/Honduran Rosewood
2014 - Peter Oberg, 640 mm, Western Red Cedar/Black Cherry

craigleaclocks
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Re: New Koa and Spruce

Post by craigleaclocks » Wed Jul 16, 2014 10:22 am

Hello,
Every time I see beautiful work like this it makes me think of packing it in.
I look at some of the guitars we have for sale and just sigh, :( and knock another 20 quid off the price.
Soon we’ll be giving them away free!
Regards,
Ronnie.

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James Lister
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Re: New Koa and Spruce

Post by James Lister » Wed Jul 16, 2014 10:41 am

Beautifully clean work as ever, Peter.

One question - do you use the Deft to get a cleaner edge when routing the binding rebates?

Errr.. one more question - do you use Deft for anything else?

James
James Lister, luthier, Sheffield UK

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Peter Oberg
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Re: New Koa and Spruce

Post by Peter Oberg » Wed Jul 16, 2014 6:18 pm

riffmeister wrote:Looking good!

What is Koa like on the back and sides, sound-wise?
I imagine somewhere between maple and Indian rosewood, but that's overly general. Same family as Australian Blackwood, and Australian makers use that wood a lot. So much depends on the top and how it's braced, body depth, bridge design, etc. There's no question in my mind that koa will make an outstanding sounding instrument. Clearly not as hard as Indian rosewood, plus the sides are lined with cypress, so I expect the sound to be a bit less bright than rosewood, but very round and sweet, especially with the spruce.

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