[Jewelry making - Article 00295] - Re: [Orchid] Mold making on the cheap

[castaldo]

========[ Invite a Friend - http://www.ganoksin.com/invite.htm  ]========

Dear William,

    This is Michael Knight at Castaldo. 

    Molds made with our No Shrink Pink rubber will indeed exhibit 0.0%
    shrinkage if done properly -- something that requires at bit of
    learning and experimentation to compensate for the wide variations in
    the generally poor quality of vulcanizer thermostats. 

    Castings, however, are a different matter entirely. And I'm sure
    that the final shrinkage of the finished piece is what you are really
    talking about and what you are really concerned about. 

    Making a mold with 0.0% shrinkage is an excellent first step but
    will not produce a final casting with no shrinkage-- there are
    1,000's of other factors involved, all of them introduced by the
    user. 

    A short and partial list of factors includes wax type, wax
    temperature, wax injection pressure, sprue length vs. width ratio,
    injection time, sprue placement, sprue design, investment shrinkage,
    metal shrinkage, rubber mold use temperature one can go on and on. 

    All these factors will exist even with an RTV rubber mold. 

Michael Knight
____________________________________________________________________
T h e   O r c h i d   L i s t
Open Electronic Forum for Jewelry Manufacturing Methods and Procedures
____________________________________________________________________
Orchid FAQ:
~ http://www.ganoksin.com/orchid/faq.htm
Orchid Archives:
~ http://www.ganoksin.com/orchid/archive
Orchid Galleries:
~ http://www.ganoksin.com/orchid/gallery.htm
Invite a Friend:
~ http://www.ganoksin.com/invite.htm
____________________________________________________________________
Tips From The Jeweler's Bench - Article Archive
~ http://www.ganoksin.com/borisat/tip_sear.htm
The Jeweler's Selected Bibliography List
~ http://www.ganoksin.com/jewelry-books
Buy Orchid Jewelry:
~ http://www.ganoksin.com/shop
____________________________________________________________________
-Unsubscribe:
-Email: orchid-request AT ganoksin.com Body=unsubscribe subject=blank
____________________________________________________________________