[Jewelry making - Article 00090] - Re: [Orchid] Firescale Prevention During Vacuum Casting

[LEESSILVER]

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

Juan,

    You are correct in wanting to keep oxygen from around your  casting.
     No oxygen, no firescale. 

    Right off the top I see two possible problems when creating a vacuum
    around your hot flask while its under a bell jar. There is a good
    possibility the heat from the flask could melt  or weaken the bell
    jar. The second problem is the affect of sucking heated  air into
    your vacuum pump for an extended period of time while the flask
    cools. 

    I would suggest you not try using vacuum and a bell jar to keep 
    oxygen away from your hot flask. 

Lee Epperson

____________________________________________________________________
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
____________________________________________________________________