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Step 4Piece them together
Next, we'll attach everything.
Start by taking two of the arms and the two "elbow" connectors. Making sure that the two C channel arms are back to back, pop rivet one of the elbow connectors to each of the arms. Flip the assembly over and then pop rivet the other elbow to the bottom of the set of arms.
At this point you may notice a couple of things. First, lining up the holes may not be exact; particularly if you drilled the holes the way I did (by eyeballing them). As long as you're close, it shouldn't make a difference; the arm will still articulate ... it will just have a little more friction. The second thing is that the elbow hinge doesn't move uniformly. Don't worry about this yet. Once the rest of the assembly is done, connected, and installed, the movement will be uniform.
Next up, take two of the "wrist" pieces (the flat ones), and pop rivet them the same way you just did the elbows (to the top and bottom respectively of one of the arms). Then take two of the "shoulder" pieces (the folded ones), and pop rivet them to the only holes left in the arms.
The last piece is strictly optional. I had some adhesive zip tie mounts that were 3/4" across. They fit perfectly into the channel and would allow me to make sure the cables stayed within the channel. The two drawbacks to this were that they were adhesive (which would come loose eventually) and that they took up about 1/8" of the base of the channel. A better solution would be to cut slots in the arms to hold velcro ties but, honestly, I was too lazy to do it. Maybe next time.
Start by taking two of the arms and the two "elbow" connectors. Making sure that the two C channel arms are back to back, pop rivet one of the elbow connectors to each of the arms. Flip the assembly over and then pop rivet the other elbow to the bottom of the set of arms.
At this point you may notice a couple of things. First, lining up the holes may not be exact; particularly if you drilled the holes the way I did (by eyeballing them). As long as you're close, it shouldn't make a difference; the arm will still articulate ... it will just have a little more friction. The second thing is that the elbow hinge doesn't move uniformly. Don't worry about this yet. Once the rest of the assembly is done, connected, and installed, the movement will be uniform.
Next up, take two of the "wrist" pieces (the flat ones), and pop rivet them the same way you just did the elbows (to the top and bottom respectively of one of the arms). Then take two of the "shoulder" pieces (the folded ones), and pop rivet them to the only holes left in the arms.
The last piece is strictly optional. I had some adhesive zip tie mounts that were 3/4" across. They fit perfectly into the channel and would allow me to make sure the cables stayed within the channel. The two drawbacks to this were that they were adhesive (which would come loose eventually) and that they took up about 1/8" of the base of the channel. A better solution would be to cut slots in the arms to hold velcro ties but, honestly, I was too lazy to do it. Maybe next time.
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