[Jewelry making - Article 00172] - Re: [Orchid] Turning Speeds and Angles for Platinum

[John Donivan]

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    Hi, Karl. This was asked once before, that I recall, but it was
    silver. I'm not hugely experienced, but I do know the answer. I don't
    know about brass, but the other non-ferrous metals need an extreme
    angle on the cutting edge. For inserts, look at aluminum cutting
    inserts - *CGT. The second letter is the clearance angle, "C" being 7
    degrees, which is quite a lot. Where your typical insert has a fairly
    subdued edge, these have what looks like a knife sticking up - if you
    grind your own just give it a higher clearance angle. Speeds I can't
    comment on in any real way, but I haven't found any troubles with
    typical speeds for the workpiece - it's that angle that solves it -
    and lubricant is highly useful, too. I'd suggest looking at aluminum
    cutting inserts - I found them at www.travers.com, but it was a pdf,
    which is difficult to link to, and either use them or use them as a
    guide for your tool making. 

http://www.donivanandmaggiora.com
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