Mark W. Ingalls
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The bulkhead and 'sleeper' are 3/4 nom. sanded ply. The arms are 1/2 nom. sanded ply.
Arms are attached to the bulkhead in pairs to balance the forces. So, each bulhead has four arms-- two long in the back & two short in the front.
We used 1/4-20 x 2-1/2 carriage bolts|washers|nuts and 1/2 x 0.257 x 1" nylon spacers (Lowes). I then counter bored one of each arm pair 1/2 x ~5/32" to capture the spacer so that the linkage was tight enough to rotate without slop or binding. Then I torqued the nut to compress the spacer.
The sleepers were topped with 3 x 19-5/8 x 1/4" nom. plywood, glued and bradded, to allow the sleepers to be screwed to the seat cushion.
The front of the seat cushion is set forward on the sleepers about 2".
Let the testing begin!
The bulkhead and 'sleeper' are 3/4 nom. sanded ply. The arms are 1/2 nom. sanded ply.
Arms are attached to the bulkhead in pairs to balance the forces. So, each bulhead has four arms-- two long in the back & two short in the front.
We used 1/4-20 x 2-1/2 carriage bolts|washers|nuts and 1/2 x 0.257 x 1" nylon spacers (Lowes). I then counter bored one of each arm pair 1/2 x ~5/32" to capture the spacer so that the linkage was tight enough to rotate without slop or binding. Then I torqued the nut to compress the spacer.
The sleepers were topped with 3 x 19-5/8 x 1/4" nom. plywood, glued and bradded, to allow the sleepers to be screwed to the seat cushion.
The front of the seat cushion is set forward on the sleepers about 2".
Let the testing begin!