Other than the fact that the ovals were hand made, this really isn’t very neander. My confession is I love my routers.
I pondered for awhile the best method to get as accurate as possible the opening for my ovals. I can’t see a knife line well enough, and a pencil line seemed too fat. Then I decided to use the Derek Cohen dovetail suggestion of using blue tape.
I covered the area with tape and then double taped the oval down to the blue tape.
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Then used an xacto to mark/cut the tape around the oval.
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Using a trim router with 1/4” bit, I removed the bulk. Then used a StewMac base with my dremel and a 1/16” bit, and did the final cut up to the tape edge.
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After a few tries and further finessing with the dremel, it was a nice press fit.
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Any minor gaps should fill when glued up.
My one main learning was how to hold the knife when marking around the oval. The first attempt, I had the knife tilted to get to the very bottom edge. It turned out undersized and a real pain to enlarge the whole thing. When holding the knife vertical to trace, it worked well with just some minor fiddling. So, I guess knife skills 101 when tracing for an inlay.
Sorry for the power tool post...but as I said...love my routers.