Sa ver tsrAfe in svijv j

Always use a little powdered borax in the metal being melted.

The time honored foundry method for casting metal, using a sand mold, was used very little by Indian silversmiths until recently. A matching pair of casting flasks is necessary, as is a quantity of fine sand. Many places in the Southwest a good sand can he found which has been blown by the wind until the edt|<!s of its grains appear rounded when viewed under a magnifying glass. Good sand can ¡ilso be purchased from jewelers' supply houses. Before being used, the sand must be mixed with water until It reaches the correct consistency. A good test for this is to squeeze a handful of sand into a "cigar". Whon the "cigar" is broken, if it breaks cleanly, without crumbling, it is about ready to use. The sand should be dry enough so that it doesn't readily stick to The fingers and also to pass through a "window screen" sifter without clogging it.

A small amount of parting powder is put on a thin cloth and the «loth tied into n hag. This is used lo dust a thin coating on the model to act as a moisture barrier.

The drag showing the top of the ring already mold

Parting powder is a moisture resistant powder, that is usually part ly composed of lycopodium powder, which is the minute spores of a club moss. This powder, when dlisted on the surface of a wet sand mold, or the surface of a model, forms a barrier to keep wet sand from adhering to the dusted surface.

ass ttthe of the proper size arnmed full o1 wet sand. A iod dowel is used to push it out This core is placed into the mold after the ring model has been removed.

The cope with the ring and Hrel in place, ready to be The core should than be The two halves are put the metal poured, for

The sprue pi a te with half arbor and sprue in place th

The trimmed ring

Tools used to form and trim the sand around models

The filed ring

The ring as it comes from the mold showing vent holes made by shoving vent wires from the top of the ring mold through ihe sand to the wood base underneath

The finished ring

^^^^^^^^^^^viith a ball point pen or other rounded instrument, rub or burnish the transparent paper over the letter with broad strokes in order to

E press and transfer the letter onto the surface of the silver. When the transparent sheet is removed, the letter will stick to the silver sheet

Saw out the initial be sawed otJt with B jew eler's saw.

The easiest and probably the best method o making initials is to use the press or transfer type letter. There are many different kinds, made by ¡* number of companies, obtainable at the local art supply store.

Belt buckles illustrating two types of overlay techniques

The jeweler's saw is used to cut out the letters.


Was this article helpful?

0 0

Post a comment