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Posted by Black Dragon on June 1, 2008, 9:02 am
Please log in for more thread options John R. Carroll wrote:
> John2005 wrote:
>>> Tooling for hard milling has come a long way over the years.
>>> People are machining 60 RC D-2 these days from the start.
>> Tool steel at RC 60 would be plenty strong. What type of cutter and
>> feed rates are needed to machine tool steel this hard ? I didn't think
>> anything would really cut tool steel that hard, let alone do it cost
>> effectively. EDM may be a way to go as well, but I'm not sure
>> expensive it is for two prototype pieces to test.
>> I think most tool steel at around 52-55 RC would have a yield around
>> 300,000 PSI which would be plenty strong (280,000 PSI compressive
>> yield strength would be enough for me) . A2 or S7 would probably be
>> ideal, but I don't know if their available in pre-hard, or at these
>> hardness levels. Generally I had thought that anything at these
>> hardness levels pretty much had to be ground.
>> I've drilled and countersunk pre-hard 4140 (I think it was 27-32 RC).
>> I just used a new HSS bit and I was surprised how easy it cut but I
>> had always thought machining tool steel in the 55-60 RC range was out
>> of the question.
> http://www.moldmakingtechnology.com/inmotion/greenleaf1/
> MMT inMotion Multimedia Presentation
> The Benefits & Techniques Of Hard Milling With Ceramics
http://www.creat.com/videos.shtml
See the hard milling and rib milling videos.
--
Black Dragon
Todays title:
Creative Violence in Sexual Relationships
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