Originally Posted by dagwood
I fucking hate alum/bronze. true bronze. rare. is ok. but still a PITA. just cause it turns nice doesn't make it fun. we call it turnin stripper dust.
and get a few bronze slivers good and deep....see how long. months...before you get them out. fuck that noise. give me H13, A3, 4140, etc anyday over that shit.
Former job used silicone-bronze for tooling pins, with sizes ranging from .625 to 4.0, mostly for weld jigs; tube assemblies. I didn't care much for cutting it either, it just didn't seem like it was happy no matter what speed you ran it. On our WW2 lathe, cutting more than .015 made such a hideous squeal the boss would complain
Any of the chrome moly's-4140, 4150, 4130, machine so fine. I think 4130 is God's own steel. Beautiful stuff to work with.
I did alot of A2..lots...because it heat treats up and grinds so nice after HT. Almost all of our pierce blank and form dies used it.
No surface grinders out there? The big ones usually come in from ship yards and oil field stuff. The little ones are nice. You can put on a really nice flat surface with them, nearly polished surface. Best machine going to milk a job