#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
on 02024-09-21#video on 5-megawatt McDonnell Douglas #nitinol engine #toread
on 02024-09-10old #video #documentary on #Nitinol #materials showing heat engine #mechanisms at the Lawrence Berkeley Laboratory, by Ridgeway Banks, assisted by Professor McMillan. The video credits Stewart Brand for first drawing attention to it in CoEvolution Quarterly. Looks like about 01975. They were hoping they could convert waste heat into a solution to the energy crisis.
on 02024-07-06