I agree. I presume this is the normal commercial available form, EN24T.
If so, I have always found this quite reasonable to machine, not quite
as free-cutting as EN1A but not that much worse either. Use a sharp tool
and you should not have too much difficulty.
I thought a milling cutter would be a good idea myself, especially a
EN 24T is in condition T ie 55/65 tons tensile, En 24 condition W is
the same material heat treated to 70/80 tons tensile.
I was therefore wondering if HSS would work or would you need to go to
something harder? I was also seeking guidance on speeds and feeds.
I would use an indexable tungsten carbide tool, as indeed I would for
the T variety. I know some people find they get a better finish using
HSS, but I seem to get a good finish with carbide, even for fine cuts.
HV325 is about HRC 34. So HSS should cope quite easily. Go for M42 HSS (8%
Cobalt) to get a longer life.
Feeds and speeds? Dunno, but I'd go with 80fpm and 1 thou per tooth because
I'm a wimp :-)
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