[Jewelry making - Article 01276] - Re: [Orchid] Silver Turning

[John Donivan]

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    If you are turning, or to some degree milling, silver, you need to
    look for clues about tooling in the aluminum business.  Silver
    machines almost identically to aluminum - a good sharp milling
    cutter gives a mirror finish, but turning it leaves chatter marks
    ALL over the place.  The reason for this is because you are most
    likely using general purpose (i.e. "for steel" tooling).  Those
    tools usually have a rake angle of 0deg to 7deg or so.  For aluminum
    an silver, you need a rake angle of more like 15 degrees -  it's
    more like a knife than a scraper.  If you go to www.travers.com (a
    great tool supply, by the way), and search for these pages:  172 and
    202 are milling sutters, but you can see the extreme angle of the
    cutting edges - that's what most high-helix cutters are for, is soft
    materials.  Page 396, at the bottom (items 22-286-700 thru
    22-286-780) are inserts for aluminum, and that's what you need to
    cut your tools to look like (silver is a candidate for chipbreakers,
    if you want to cut them, too).  If you cut a HSS tool to look like
    those, with strong angles, I promise your turnings will be smooth as
    glass...... 

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