Build Calibration Frame
Assemble the calibration frame as shown. The frame consists of 3 x 36” extruded struts. A 90 degree corner bracket and 5 hole plate are used on either side.
The center holes of the curved guide plates must line up with the pre-drilled guide hole in the center of the 36” strut, as shown.
Make sure that the sliding plate mounts are flush with the front of the frame (opposite the curved guide plate), and are spaced so that the centers of the threaded holes for mounting the Gatorboard are 28.5” apart.
Bond Gatorboard
Cut a sheet of 1/2” thick Gatorboard to dimensions of 42” x 70.375”. Bond the calibration target sheet onto the Gatorboard with Spray 77 or an equivalent adhesive, being careful to prevent bubbles or air pockets from forming.
Align Target to Frame
Next, drill 1/4” diameter holes centered on the 4 hole guides circled above.
Push a narrow drill bit or Allen wrench through the center of the calibration target (marked by a black dot) and the Gatorboard. Insert this through the center guide hole of the 36” center strut of the calibration frame. This alignes the optical center of the calibration target with the center of rotation of the calibration frame.
Attach Target to Frame
Insert the provided 1/4-20 socket head cap screws and fender washers into the 1/4” mounting holes you’ve just drilled in the target. Carefully rotate the target atop the frame (pivoted on the drill bit at the center of the target) until the 1/4-20 cap screws thread into the threaded holes in the plate mounts (the plate mounts may need to be loosened and adjusted slightly back and forth in their slots to align everything correctly).
After all 4 cap screws are threaded into the plate mounts, tighten both the cap screws and the sliding T-nut screws that hold them into the frame.