From your 7/8'' line to the short end of the wood, sand at some sort of angle, curved or straight. You want to drop the edge at least 1/8'' to get the approximate shape.
From the 2 3/8'' line to the edge, sand a angled line. If you need to, you can adjust where the angle starts (if it's too close to the edge of the hole, you definitely want to move it away some). My angle is roughly 30 degrees but I went with more of a 'does it look right' vibe than an actual measurement.
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ISAC Build - Cutting the Channel |
Tuesday, October 4, 2016 |
By
Wulf |
To cut the groove in the wood, first draw a line in the center of the wood to the edge. Measure 1 1/4' on either side and draw a line there as well.
Now we get to the hard part and the following isn't my step by step but is a combination of a couple of techniques that I finally managed to make work in the end. The best way I finally found to do it was to take a dremel with a cutting (saw?) attachment and use it to cut the lines about a 1/4'' down. After that, grab your chisel and chisel out the channel. Sand it however you need to, I did a combination of sander, dremel, nail file (for really fine parts), and the jewelry files. Hopefully, you can find an easier way of doing it for yourself!
In the end, your basic shape looks something like this...
 
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