Homemade sheetmetal bender. By Mistry MakeTool. 10:53 video:
Sheetmetal circle cutting - GIF
3D-printed sheet metal louver forming tool - video
This design is quite good. Simple, rugged, compact. This could easily be motor powered as well.
The commercial hinged versions need a lot of hardware, replicating the castings with weldments are beyond capabilities of a small shop
...we'll learn more by wandering than searching...
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