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Thread: HSS/carbide tooling
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11th April 2007, 02:36 PM #1
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HSS/carbide tooling
I need to lathe a shaft of 4140 steel.Do I have to use carbide tooling(expensive I know) or can I use conventional HSS? And once I got carbide tooling can I use it on ordinary mild steel (I thought I heard/read somewhere that using carbide on mild steel can bugger the carbide tooling over time)?
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11th April 2007, 05:04 PM #2
Young Bull
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Not at all. You'll find the carbide tooling, provided you don't smash it into the workpiece at a million miles an hour will do just fine. HSS on mild steel is supposed to be run at 35m/min, whereas carbide is typically around 125 m/min. (Nearly 3.5 times faster.)
So for a 50mm dia lump of 4140, you'd be looking at around 800rpm for carbide, versus HSS which would work out at less than 250rpm.
Here's the catch. If it's a one off, I'd buy a HSS blank, as you can grind it on an off-hand grinder for different jobs later on.
'What the mind of man can conceive, the hand of a toolmaker can achieve.'
Owning a GPX250 and wanting a ZX10 is the single worst experience possible. -Aside from riding a BMW, I guess.
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