mounts all can incorporate this azimuth setting circle
design. We use 18mm (nominally 3/4") Baltic Birch
for mount construction. Items 1 and 2 in the diagram are
the underside of the rocker box bottom board, and the
top side of the ground board. Item 1 also has a 1"
wide oval notch as shown.
the rocker box bottom board and ground board are incised
inward from their circumferences one inch to 7.65mm depth.
The ground board is additionally lightened with the circles
cutout, removing material.
3 is the actual setting circle. It has laser inscribed
numbers and increments. Made of 12mm birch plywood (nominally
1/2"), its inside diameter is 0.1875" larger
than the outside diameter of the incised portions on the
rocker box bottom board (gray area) and ground board (gray
3 (setting circle) will sit on the inscribed section of
item 2, and when item 1 (rocker box board/assembly) is
added, the setting circle numbers and increments will
show through the notch opening, shown in item 4. The rest
of the setting circle will remain unseen and safe.
the item 3 protrusion is a nylon screw and tightener,
which is to be used as a small handle for turning the
contained setting circle.
use: place your mount on the ground. Turn the rocker box
to north. Using the nylon screw rotate the setting circle
to north matching the pointer. Finally, turn the screw
upward to lock the setting circle against the bottom board.
setting circle is now aligned to north, and ready for