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Routing internal chambers with a template. This operation cuts several of the acoustic chambers in the center area of the body.
Here are the top and back with all of the internal routing completed. Note how little wood is left! The center section of the body is filled with chambers with thin walls between them.
The black epoxy is sanded off, leaving it just down in the grain...a messy job! This does the rough filling of the grain, and provides a nice black contrast.
Here's the top and back with the F-holes cut through.
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This operation rough cuts the control cavity and two of the other chambers. You can see how the cutouts in the template are offset in size to allow for the collar on the router base.
This is a good time to start filling the grain on the outer surfaces of the body. The surfaces are first coated with Smith's MultiWoodPrime, which sinks down deep and provides a base for the subsequent coats to bond to. Then, West Systems epoxy tinted black is poured on and squeezed down into the grain with a piece of stiff cardboard.
The top and back are temporarily pinned together and put into this fixture, where I rout the F-hole openings.
The edges of the F-holes need to be smooth and wear resistant. I coat them with black epoxy, sand that smooth, and then brush on 2 coats of black KTM-9 paint.
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