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  • DavidH864 commented on WoodPlusMore's instructable Articulated Utility Arm2 years ago
    Articulated Utility Arm

    I made this yesterday in about 1.5 hours. Using a 2" x 4", I cut the pucks with a 3" hole saw that has a 1/4" pilot. I also used 3/4" O/S aluminum conduit for the arms and varied their lengths by about 3" or so so the arms would fold-up tighter. I then used a 3/4" hole saw to cut ring holes in the pucks and was just going to jam them in with a little glue, but when I discovered I didn't have any I ended up securing them all with self-tapping screws. The 1-1/4" knobs I use for adjusting friction came with pre-drilled 1/8" holes, but I couldn't find 1/8" carriage bolts longer than 3" (needed 3-1/4"+) and the knobs weren't threaded anyway so I ended up using 1/4" x 3-1/2" carriage bolts and a 11/16" bit to drill...

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    I made this yesterday in about 1.5 hours. Using a 2" x 4", I cut the pucks with a 3" hole saw that has a 1/4" pilot. I also used 3/4" O/S aluminum conduit for the arms and varied their lengths by about 3" or so so the arms would fold-up tighter. I then used a 3/4" hole saw to cut ring holes in the pucks and was just going to jam them in with a little glue, but when I discovered I didn't have any I ended up securing them all with self-tapping screws. The 1-1/4" knobs I use for adjusting friction came with pre-drilled 1/8" holes, but I couldn't find 1/8" carriage bolts longer than 3" (needed 3-1/4"+) and the knobs weren't threaded anyway so I ended up using 1/4" x 3-1/2" carriage bolts and a 11/16" bit to drill out the knobs so I could install a 1/4" x 20mm threaded insert. It works well, but I may add some springs behind the upper pivots so it wants to retract rather than sag. I would recommend choosing bigger knobs with more grip to those attempting this, a ball valve knob would be perfect. I use it to support a light and some alligator clips as helping hands. Might add a big magnifying glass later. Thank you WoodPlusMore for posting this. Prior to this Indestructible I was using a wall mounted articulating arm I built from Kinex that had a limited 18" radius. This new one now provides nearly a 5' radius and was super easy. Awesome!

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