BRIAN.T
Cast Iron
- Joined
- Jul 23, 2018
- Location
- Los Angeles
I don't think I've ever cut heat treated 4140. How difficult is this condition to work with? The part isn't too complicated, it's got a few +/- .002s on it.
Thanks
Thanks
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I don't think I've ever cut heat treated 4140. How difficult is this condition to work with? The part isn't too complicated, it's got a few +/- .002s on it.
Thanks
very slow going, turn and mill?
part is solid and no hollow areas? no small holes or center drills?
Harder than the hubs of hell
Not really. 50-55Rc is fine to machine. It starts to be a P.I.T.A. when the Rockwell gets to 60+.
When you're cutting 50+Rc turn the coolant off and use air blast. Obviously you'll have to slow down you speeds and feeds but once you dial it in it cuts rather easily.
Except for them damn feed marks ... now if you grind it ...... you actually have to try to not get a mirror finish
Well, I started playing with hard 4140 and in the mill, I had to get used to low surface speeds and feeds. 50 SFPM and I haven't tried very heavy cuts.
IMCO tooling made for hard stuff.
Seems to work just fine.
50 SFM? Are you using HSS? Thats too slow even for tool steel in the 60s with carbide.
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