Quote Originally Posted by Silversprings View Post
Great info Steve. I thought only us dinosaurs used die heads, and needed the chasers sharpened. I guess the CNC guys might use them too.
Re chasers, I'll check what I've got and get back to you. I do know I've got a few really odd ball ones....probably not that useful to you either.
Cheers, Tony


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Tony...
Hay we maybe not such dinasaurs... the guy I go the 1" head from was using it on an old hurcas belt drive drill press, vertically threading assemballed rag bolt footings. He had NC and CNC, used to "chomp out" the rag bolts (undersizing them for gal) on the big NC. He set coventry head up because even when he cut the thread undersize for the gal (on the nc)... "they still stuffed it up every time" (as he put it) and always had to "die nut them" any way. His customer wanted "clean threads" and tried all manner of things to protect them from the gal. In the end he just used the 1" cs head on the drill and run the thread down to the assembled footing bolts... perfect clean threads every time... as he put it! All he had to do was a decent champher on the bolt ends, to start the chaser/s.

Still making them till he retired @83... now that's a bloody machinest and a lateral thinker!

Steve.