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One of the first operations after the two halves of the top are joined
is the application of the soundhole rings. |
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A large CNC machine cuts the tops to an oversize contour |
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Those tabs at the waist have index holes so the tops
can fit precisely into various fixtures during the assembly process |
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Top braces are glued in vacuum presses. |
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Bins of CNC machined top braces at the ready. |
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A full set of top braces, laid up on the press, ready
for the lid to come down with its rubber diaphragm under which the vacuum
will applied. |
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The same big CNC machine cuts the outline of both the
tops and backs |
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Here, wood is being graded and matched for backs and
sides. |
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Laying out the back pieces. |
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Tops and backs are joined on this "windmill"
clamping rig. |
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By the time the last back is glued and clamped, the
first one is ready to remove, so this fixture is capable of continuous
output. |
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The CNC in action. |
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This back has had the center strip reinforcement applied
and notched to receive the back braces. |
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Back braces are clamped using similar vacuum fixtures. |
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A back, right out of the press. |
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It takes quite a bit of moist heat to make the side
pliable enough to bend, and this press is just the thing to do that job. |
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It's not a matter of heavy pressure, but a slow controlled
bending process, that gets the job done right. |
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Many of the tighter bends, cutaways, and special models
are still done by hand on classic old time heated "bending irons." |
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Another venerable bender. |
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Here, a cutaway side is bent on a modified version of
a machine designed by Charles Fox. |
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Bent sides, sitting in precision aluminum molds which
are indexed for precise positioning of neck and end blocks. |
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Once the blocks are glued and clamped, and the assembly
can be removed from the mold. |
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Just drying. |
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Back at the CNC machining center, "kerfed"
linings are cut automatically with a small gang of saw blades. |
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Linings are glued in place the same way they have been
for generations, using those classic wooden spring clothes pins. |
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Lots of clothes pins! |
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After linings are glued in, the sides go back into an
aluminum mold, so they can be held rigidly while the contour of the top
and back radius is sanded. |
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This horizontal disc sander has the same concave radius
as the top or back. |
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The aluminum mold fits right into the cabinet, which
is connected to the vacuum dust collection system. |
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Once in the machine, the mold simply settles down onto
indexing stops to limit the sanding, perfectly defining the contour and
depth of the sides, neck and end blocks where they will contact the top
and back. |
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Presses for clamping tops and backs. |
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Each top and bottom plate has a rubber gasket in the
outline shape of the top or back to apply pressure evenly across the joint. |
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It's fun squishing these bodies up! |
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A completed body, with its love handles still attached. |
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After trimming the back and sides, it's time to cut
the channels for the purfling and binding around the body, on a horizontal
shaper. |
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It takes a lot of different cutter assemblies to accommodate
a wide variety of styles, from the simple "16" to the elaborate
"45." |