[Jewelry making - Article 00628] - Re: [Orchid] [Source] Indexed ring mandrel

[leonid surpin]

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

    I do not have a good source for the indexed ring mandrel, but I can
    offer a substitute which I have been using for many years and it
    will cost you nothing. 

    Take a brass plate and cut out a disk of the diameter a bit larger
    than the largest ring size you think you might need. With the
    dividers inscribe progressively small circles graduating towards the
    center. On mine each circle corresponds to ring size. Divide the
    circles as required for application. 

    To achieve precision in dividing circles, use intersecting arcs
    method. Start by drawing diameter ( any line through the center. Next
    position one point of dividers on the intersection of diameter and
    the circle, open dividers more than 1/2 of the diameter and draw an
    arc which would cross the area where the center would be. ( no great
    precision required ). Position dividers on another intersection of
    the diameter with the circle and draw another arc in the same manner.
    The arcs will intersect exactly opposite the center of the circle.
    Using intersection of arcs and the center of the circle draw a line
    until it intersects the circle on another side. You have divided
    circle into 4 equal arcs. 

    Using the same method you subdivide each arc into required number of
    subdivisions. Use sharp scriber and when done, mix some artist oil
    paint with turpentine and rub into the marked lines. After it dries,
    use emery stick to remove excess of paint and the scribed lines will
    stand out sharply against the metal. Now you have a permanent
    circular ruler which you can use to divide rings into any number of
    divisions. 

Leonid Surpin
www.studioarete.com
____________________________________________________________________
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
____________________________________________________________________