New Koa and Spruce

Construction and repair of Classical Guitar and related instruments
StevSmar
Posts: 541
Joined: Sun Dec 25, 2011 2:42 pm
Location: Winnipeg Canada

Re: New Koa and Spruce

Post by StevSmar » Fri Jul 25, 2014 1:57 am

Thanks for posting about the guitar you're building. Fascinating.

What's the reason for the light coloured wood recessed into the neck?

Interesting that Australian Blackwood is like Koa, I'll have to look for some next time I visit Australia
Regards,

Steven from Winnipeg

User avatar
Peter Oberg
Luthier
Posts: 800
Joined: Fri Jun 30, 2006 10:44 pm
Location: San Diego, California

Re: New Koa and Spruce

Post by Peter Oberg » Wed Jul 30, 2014 2:06 am

Classicalmark wrote:That is a very beautiful guitar. I particularly like the rosette and head stock. The headstock ornamentation reminds me of Simplicio guitars that I have seen (never played though). Thanks for sharing.
Thanks for the kind comment, I appreciate you noticing those two things.

User avatar
Peter Oberg
Luthier
Posts: 800
Joined: Fri Jun 30, 2006 10:44 pm
Location: San Diego, California

Re: New Koa and Spruce

Post by Peter Oberg » Wed Jul 30, 2014 2:08 am

StevSmar wrote:Thanks for posting about the guitar you're building. Fascinating.

What's the reason for the light coloured wood recessed into the neck?

Interesting that Australian Blackwood is like Koa, I'll have to look for some next time I visit Australia
It is a piece of hard maple, let in to add stiffness to the neck. Never used a truss rod or carbon fiber...still using wood.

User avatar
Peter Oberg
Luthier
Posts: 800
Joined: Fri Jun 30, 2006 10:44 pm
Location: San Diego, California

Re: New Koa and Spruce

Post by Peter Oberg » Wed Jul 30, 2014 2:22 am

In order to shape the top of the fingerboard I like to have the actual bridge set in place, so I need the underside to match the curve of the dome of the top.
Image

The jig works with the drill press and a Robo sander.
Image

Bridge sitting where it will live, with a dummy saddle. I use an action stick to mimic the string band, dictating how to plane the board.
Image

Planing the fingerboard. Do not hit the top while planing!
Image

Scraper after the hand plane. You can see how much wood I removed in the pile of ebony shavings.
Image

Superglue on the fingerboard. Ventilation required.
Image

Crown of the board. Looks like more than it is.
Image

Cutting fret ends. Warning, another opportunity to damage the top here.
Image

Marking the heel cap before starting to carve the neck.
Image

Nothing like a good knife for carving areas like this.
Image

I love my drawknife.
Image

A half-round rasp with safety edges and a rounded end to blend the transition from neck to head.
Image

Filling the fret slots with blackened epoxy.
Image

iim7V7IM7
Posts: 151
Joined: Fri Jun 13, 2014 10:41 pm

Re: New Koa and Spruce

Post by iim7V7IM7 » Wed Jul 30, 2014 3:52 am

Thanks for sharing this work sequence. What is the application of cyanoacrylate to the ebony fingerboard for?
2015 - John Buscarino, 650 mm, Carpathian Spruce/Honduran Rosewood
2014 - Peter Oberg, 640 mm, Western Red Cedar/Black Cherry

User avatar
Peter Oberg
Luthier
Posts: 800
Joined: Fri Jun 30, 2006 10:44 pm
Location: San Diego, California

Re: New Koa and Spruce

Post by Peter Oberg » Wed Jul 30, 2014 8:27 pm

iim7V7IM7 wrote:Thanks for sharing this work sequence. What is the application of cyanoacrylate to the ebony fingerboard for?
You're welcome.
Regarding the cyano, the thinking is that flooding the board with it will help stabilize the ebony, which is notorious for continuing to dry and shrink, even after years of seasoning in a shop.
p

Charles Simons

Re: New Koa and Spruce

Post by Charles Simons » Wed Jul 30, 2014 9:59 pm

Do you find using a drawknife more controllable than a spokeshave or is it just faster?
Looking very awesome!

iim7V7IM7
Posts: 151
Joined: Fri Jun 13, 2014 10:41 pm

Re: New Koa and Spruce

Post by iim7V7IM7 » Thu Jul 31, 2014 4:33 pm

Interesting, I had never seen an ebony fingerboard flooded in that manner for that purpose.
Peter Oberg wrote:
iim7V7IM7 wrote:Thanks for sharing this work sequence. What is the application of cyanoacrylate to the ebony fingerboard for?
You're welcome.
Regarding the cyano, the thinking is that flooding the board with it will help stabilize the ebony, which is notorious for continuing to dry and shrink, even after years of seasoning in a shop.
p
2015 - John Buscarino, 650 mm, Carpathian Spruce/Honduran Rosewood
2014 - Peter Oberg, 640 mm, Western Red Cedar/Black Cherry

User avatar
Peter Oberg
Luthier
Posts: 800
Joined: Fri Jun 30, 2006 10:44 pm
Location: San Diego, California

Re: New Koa and Spruce

Post by Peter Oberg » Thu Jul 31, 2014 8:50 pm

Charles Simons wrote:Do you find using a drawknife more controllable than a spokeshave or is it just faster?
Looking very awesome!
The advantage of a good, sharp drawknife is that it is fast. There is a minimum of 3 mm of wood in thickness to remove, so I can get rid of that quickly, then change to the spokeshave, a knife, a scraper, and sandpaper. If you start wtih a thinner neck blank, the heel to neck joint will creep out on the flat of the neck, and become almost feathered. Plus I like the look of the joint landing up a bit on the curved surface.

simonm
Moderator
Moderator
Posts: 6816
Joined: Sat Jun 27, 2009 10:22 am
Location: Germany, Würzburg. Spain, IB

Re: New Koa and Spruce

Post by simonm » Thu Jul 31, 2014 9:01 pm

:merci: :merci: :merci:

User avatar
Peter Oberg
Luthier
Posts: 800
Joined: Fri Jun 30, 2006 10:44 pm
Location: San Diego, California

Re: New Koa and Spruce

Post by Peter Oberg » Thu Jul 31, 2014 9:04 pm

In the white:
Image
Image
Image
Image
Image
Image

Freshly egged and ready for polish:
Image
Image
Image
Image
Image
Image

iim7V7IM7
Posts: 151
Joined: Fri Jun 13, 2014 10:41 pm

Re: New Koa and Spruce

Post by iim7V7IM7 » Thu Jul 31, 2014 10:27 pm

Beautiful Peter...

Once you get some french polish on it, the flamed curl of the koa and the hazelfichte in the engelmann will begin to visually blossom.

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

brooks
Posts: 1022
Joined: Tue Feb 20, 2007 12:11 am
Location: halifax, nova scotia

Re: New Koa and Spruce

Post by brooks » Thu Jul 31, 2014 11:19 pm

iim7V7IM7 wrote:Beautiful Peter...

Once you get some french polish on it, the flamed curl of the koa and the hazelfichte in the engelmann will begin to visually blossom.

Kudos
begin? if that guitar visually blossoms any more, i'm going to have to sell a kidney.... :chaud:

stunning work, Peter. I'm sure the sound will be just as beautiful

User avatar
martinardo
Posts: 834
Joined: Wed Aug 11, 2010 8:01 am
Location: Victoria Australia

Re: New Koa and Spruce

Post by martinardo » Fri Aug 01, 2014 1:58 am

Great thread and photos, Peter. Thanks for taking the time to document some of the steps

in your marvellous work.

One question I have: Is the inclined angle of the peghead quite shallow (relative to the fretboard) or perhaps

it's the camera positions ? Most tasteful carving on the face btw.
I'm pink therefore I'm Spam

riffmeister
Posts: 4163
Joined: Sun Nov 30, 2008 9:15 pm
Location: Philadelphia, PA, USA

Re: New Koa and Spruce

Post by riffmeister » Fri Aug 01, 2014 12:30 pm

Taking shape nicely.......and looking gorgeous!

Return to “Luthiers”