- Stone-in-place casting dramatically reduces labor
costs associated with manually setting the dozens of tiny gems
permitting cost-effective, large-scale production
- There are two setting methods for stone-in-place
casting. With the first, the stones are positioned in the rubber
mould and the wax is injected around them; when the wax is extracted
from the mould, the stones are already set. This method can be used
only with round stones. With the second method, the stones are set
in the wax. This method allows for the setting of any type of cut:
round, oval square, marquise, pear, emerald, baguette, tapered
baguette and fancy cuts
- In stone-in-place casting process the key point
is the preparation of the master model. An adequate preparation of
the model leads you to an easy, rapid, precise and safe wax stone
setting and a top quality final product
- Recent trend is Computer aided model making and
rapid prototyping with presetting
- In stone-in-place casting, a wax model of the
Jewellery piece is created, and the stones are set into the wax
prior to casting. In mass-produced pieces, a rubber mold of the
finished piece is used to make multiple wax models. The waxes may be
set individually with the stones, or in some cases, the stones may
be placed into the rubber mold and the wax injected around them, to
produce a wax model in which the stones are already set.
- The wax model is placed into a flask and a
fine-grained, heat-resistant plaster called "investment" is poured
around it. Once the plaster has set, the flask is placed into an
oven and heated until the wax burns off, leaving behind an empty
cavity and the stones, which are held in place in the cavity by the
investment
- The Jewellery metal, normally gold or silver,
since platinum's melting temperature is higher than most stones can
tolerate, is melted and poured into the cavity, filling the space
left by the wax. After the flask cools, a finished, stone-set
Jewellery piece is removed from the investment.
- Stones that change color when exposed to high
temperatures, such as amethyst or blue topaz, or which will burn at
these temperatures, such as pearl and turquoise, are not suitable
for stone-in-place casting
- Successful stone-in-place casting also requires
careful design of the settings, so that the investment will hold the
stone securely during the casting process. And even with good design
and execution, a certain number of stones will loosen or crack
during casting. As a result, stone-in-place casting is almost never
used for setting large, fine quality gems, which are expensive to
replace if damaged
- The easiest type of wax to use will have good
flexibility to set the stone and sufficient resilience to spring
back and hold it securely in place.
- The stones need to fit exactly into the wax
pattern, claws may need to be adjusted accordingly
- Firing with natural stones requires a lower
burnout temperature (maximum 630°C/1166°F) and this can give a poor
burnout. Any carbon residue from the wax left on or adjacent to the
stones can lead to burning of the stones and so it is vitally
important that there is a good air flow through the furnace during
the burnout procedure. This is easy to achieve in gas fired furnaces
but electric furnaces may need extra ventilation holes drilling
through the brickwork at the bottom or through the door.
- Knowledge about limits, (suitable setting, kind
of stones and possible alloy), adequate tools and equipment as well
as good processing and working skills are also necessary for good
results
- There are Training Institutions, consultancy
organisations exist in different parts of the world for skill
development, process improvements to achieve Productivity and
products Innovations
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Basics
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Stone in Wax Casting
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Cubic Zirconia & Gems
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FAQ: Stone Casting
Manufacturing
Steps
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Production Steps
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Casting
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Dewaxing & Firing
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Investing
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Model Making
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Proportioning Charts
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Sprueing
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Wax Patterns
Process
Information
- Casting Stones in Place
- Casting Metal Directly onto
Stones
- Casting with the Stones
- Lost Wax Investment Casting
Process
- Casting with Cubic Zirconia
set in wax
- Colored stone pavé-set
Jewellery
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Machinery & Tools supplier
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Jewellery Casting Machinery
suppliers
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Lost-wax jewellery casting equipment
Project
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Complete Project & Technology
provider
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Investment powder for jewellery
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Stones, Metals & Tools
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Wax Models
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Guide to Manufacturing
Company & Products
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- Company - USA
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Technical
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- Jewellery Design - Wax
Carving
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World of Industry & Trade
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Recent trends & Developments
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