The time and energy spent assembling the 3/8 scale model several times for practice will prove its value later when we are working with the real 20 foot long 2 x 12 chord pieces that make up the lattice trusses for the South Wayne bridge project.
Here Alex and Lynnan are pinning together chord layers 1 and 2 using two inch long trunnels. After figuring out the numbering and playing card identification system they carefully layed these two layers and will place one shortened trunnel into each group of three holes.
At the top of the picture, behind Alex you can see layers 3 and 4 in their bundles. Very important not to mix them up.
With the layers 1 and 2 secured the first web layer, layer 3 was put in place and secured with a single trunnel in each end. This trunnel was three layers long.
After a little head scratching and hunting the process was in full swing. Layer 4 in the truss goes on.
They ran out of time for the day but I assured them that I would dis-assemble their work, re-bundle the pieces and they would have another opportunity to have some more "serious fun" and try it again. This time finishing the full assembly without any help. They said they were up for the challenge!
Puzzler - What is the difference between the two clamps in the picture below and how are they used in truss assembly?