Sunday, August 16, 2009

Focuser board

After finishing the spider, I needed to determine where to drill the holes for the screws that will hold the focuser board and the base for a finder scope. After laying them out, I drilled pilot holes in the rings with a countersink bit, then enlarged them with a 3/16th inch bit. I used a jig to hold the boards vertically while drilling smaller holes into the wood strips on the focuser board and the base for the finder scope. They were then secured with 1 1/2-inch #10 stainless steel screws. The parts were also sanded to remove left over wood glue and the opening for the focuser was drilled out 5 inches from the top ring to the hole's center. Next I drilled two 1/4-inch holes for the poles seats 4-inches apart center to center, and two inches to center from the line midway between the struts. I also sanded off the edges with medium grit sandpaper. The rings are now ready to be filled and sanded with fine and very fine sand paper in preparation for varnishing.

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