“SCHAUMBURG, IL—In an ultimately futile act some have described as courageous and others have called a mere postponing of the inevitable, existentialist firefighter James Farber delayed three deaths Monday.” #humor
#video of #Gelbart mostly about how to use adhesives, especially silicone, epoxy, polyurethane (e.g., Gorilla Glue), and spray contact cement. Also talks about #flexures for clamping things. And how peeling-mode failure kills adhesive joints, though less so if you use flexible adhesives. #manufacturing
#video of #Gelbart mostly about spot welding. He recommends 15–25 kVA spot welders at 2½ volts with 5000 amps, for 1–4 cycles for thin ferrous sheet metal, up to 10 gauge, and up to 12 cycles for mounting hardware like screws or, with a conical-hole electrode, balls for kinematic mounts. I’m guessing a “cycle” is 16⅔ms. Talks about how to spot-weld #nitinol into #flexures. Recommends tungsten/copper or chrome/copper alloy tips for your electrodes. #manufacturing #precision
#video on recreating #Gelbart’s bending brake #manufacturing
#pricing of natural gas #energy in #USA: US$3.61 per thousand cubic feet (28.3 m³)