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PEWTER, SMALL SCALE CASTING PROJECT - 1 |
V. Ryan © 2007 - 2009 |
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You are the manufacture a medallion based on an
initial. The initial will be manufactured through small scale casting of
pewter and then cleaned and polished by hand. Although the best metal for
small scale casting, even a small amount is expensive. |
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You will also manufacture the casting box. Inside this
box will be placed sand called petrabond which consists of fine, high
purity, silica sand bonded with oil. A pattern will be pressed into the
sand and the molten pewter poured into it. |
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The first stage is to make a casting box. This is
composed of two pieces of 3mm MDF and four sides made from pine or similar
material. The sides can be jointed using rebate joints and glue or left as
simple butt joints. |
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The rebate joint seen above is quite strong when glued.
It is stronger when the four sides of the box are glued to the base. |
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A butt joint is seen opposite. This is strong enough if
the four sides of the box are also glued to the MDF base. |
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The main parts are shown below. |
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1. The two sides to be jointed are arranged as shown in
the diagram. A pencil is used to mark the thickness of the material.
Alternatively look at point 2. |
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2. A marking knife and a try square are used to mark
the material as shown on the diagram. It is possible to use only a pencil
but a marking knife is more precise and it has the advantage of cutting
the wood fibres. This means when a saw is used to cut the joint the
surface of the wood is less likely to split. |
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3. A marking gauge is then used to scribe a line around
the end. A pencil can be used for this stage of marking out but the gauge
cuts the fibres of the wood. This means that when a saw is used to cut out
the joint, the joint is more precise. |
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CLICK HERE FOR NEXT STAGE OF
PEWTER PROJECT |
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CLICK HERE FOR EQUIPMENT AND PROCESSES
INDEX PAGE |
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