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THE PINECONE BACK

5/8/2017

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The toughest part of the build is digging out the concave back and thinning it to the right thickness
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After shaping the outside like you want it you turn the piece over and begin hogging out the inside.
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I use a forstner bit that has had the point filed a little shorter. Set the drill press so that the tip of that point stops just at the desired thickness of the back.
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Then, when you have hogged out all the wood possible grind down the rough spots with a disc sanding device on an electric drill.  You sand away wood with a coarse grit (36 grit) sand paper, until all the holes have disappeared.  Then you will know that your back is at the right thickness.
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This is a dusty tedious job. use a new sharp sanding disc and finish with a finer grit, but hang in there.  It is the only way that I have figured how to make a concave hollow instrument back.  Be sure to wear a dust mask.
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