TECHNICAL INSTRUCTIONS
MODELING: Commercially made plastic patterns are availatvle for most
of the framework.
SPHUING: Sprue through a hole centrally located in the mold. Location
and amount of sprues are at discretion of lab technician. It is advisable to
join together tips of the clasp to help prevent incomplete casting.
INVESTING: After wax model is completed. invest the ring with partial
investment following manufacturers recommended instructions. if you
are using a rapid-fire investment. follow the manufacturers instructions.
BUFINOUT:
Recommended cycle:
1. Start-up at 750-B50°F (4DO»455°C)
2. After 1 hour increase to 2000°F (1095°C)
3. Hold at 20D0°F (1D95"C) for 1 hour.
4. Use spacers under the ring.
Note: The process above is recommended. Each investment is unique,
please review investment manufacture instructions.
CASTING: Use induction or torch casting. when using the oxy-acetylene
torch, equipped with no. 4 or no. 6 tip, adjust the flame with inner core
between 1/2 inch and 1 inch (12mm - 24mm) long. Do not hold torch too
close to the alloy. Cast when the metal slumps. Do not overheat the alloy.
Do not pull the torch away from the metal when casting. After casting,
allow the ring to bench cool.
FINISHING: Sandblast casting thoroughly to remove all evidence of
investment particles and oxide suflace. Finish with appropriate stones
and E|ectro<polish as per manufacturers recommended instructions.
SOLDERING: Use: Co/Cr Pre