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Flow drill for pipe threads - they only list up to 3/4 Flowdrill - Products - Flowdrill
A couple of questions:
1. How does that put the threads on ?
2. how do you sharpen it (or even know when to) ?
I've never used one of those friction drills, but I have seen them work. They leave a pretty nappy hole.
I think you would be better off with a threaded rivet bushing- you punch a regular hole in your sheet metal, and then use a press of some sort to rivet a pre-threaded bushing in. Cheaper set up, time tested, and reliable. Several companies make these-
https://www.rgafasteners-psm.com/files//PSM.Files/anchor rivet bush.pdf
Anchor Rivet Nuts and Clinch Nuts - inserco.eu
It's two hits...first a pre-punch and then an extrude tool-->Extrusion | Punch Press Tooling Catalog | Wilson Tool Punch Press Job it to a sheet metal shop with a turret punch.
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