[Jewelry making - Article 00941] - Re: [Orchid] Split emery mandrels for sanding - dangerous?

[KARAT46]

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

    The metal alloy, the heat treatment and manufacturing techniques
    determine if the products for flexshafts are safe or not. 

    If you spin these at slow speed they do not bend. It is the
    velocity, the metal and also the lopsided load that bend it right
    away. 

    Most of these mandrels specially the ones from Grobet are made in
    Germany. These are made on Swiss Screw Machines (Automatic) they spit
    these out at high speed and are well balance plus the metal is strong
    to begin with. 

    Recently there has been split mandrels made in India and they are
    brass nickle plated. These are made on manual machines with cheap
    labor. To begin with the metal is no good. The machines that they make
    these with cannot turn out well balanced pieces. The slotting is not
    done right and it is a disaster in waiting. 

    I would not blame the vendors alone. The market seems to be looking
    for prices and most of the manufacturers in the third world countries
    dont even know what you are using these split mandrels for or at what
    speeds. We use to have 18,000 rpm and now with micro motors we are
    spinning these at 30,000 rpm 

    Please Protect yourself with any of these German or Indian 

Kenneth Singh
46 Jewelry Supply.
____________________________________________________________________
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
____________________________________________________________________