The thickness of the ground glass holder is crucial to setting the ground glass at the plane of focus or film plane. I measured carefully the distance from the edge of a holder to the surface of a sheet of undeveloped film and got 3/16″. My glass is 3/32″ thick. So I planed the cherry to just a little proud of 9/32″. I laid out the the pieces and ripped the cherry to dimension:
Then I crosscut the pieces to final dimension and did a quick check for fit:
The pieces are joined with half lap joints cut with a horizontal router table. It’s not difficult, but more an exercise in transferring dimensions from piece to piece. Half lap cuts on pieces this narrow and thin, though, are a little hairy. I cut close to the lines and clean up with a chisel.
The final frame, dry fit:
Next step: Lay out and cut the rebate for the ground glass, then glue up the frame. The trick with the cuts will be the two stopped rabbets to be cut in the stiles. More on that later…