[Jewelry making - Article 00041] - Re: [Orchid] Casting a detailed CAD/CAM piece

[Paul D. Reilly]

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David,

    With lettering at only .4 to.25 mm wide in the master, production
    pieces will have areas that are only 0.2mm wide at best. At the
    specified lettering width, the CAD model letter depth should be no
    more than 0.5 or 0.6 mm for cross sections that thin. Even that is
    asking for a low ratio of good to bad castings/ injections. Cost wise
    it is overkill, but most of the platinum investments will hold up
    better that Satin Cast for sections that thin. 

    One other suggestion is: make your letters taper in width. That is,
    if they are raised letters, wider at the inner surface tapering to
    the designated width at the top of the letter; if they are inscribed
    letters, make them the designated thickness at the deepest point and
    taper them out to at least 0.5mm at the attachment point to the
    outer surface. 

    If you need to see what I mean, email me off line and I will send you
    examples of the two scenarios with pictures of what I've done in the
    past for CAD/CAM clients. 

Paul
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