This article shows how to turn the high-resolution prints with the CA-100 (Nyomo castable material) into investment-ready pieces.
WARNING! The first step for a good casting result it's the printed object finishing, make sure to follow the instructions HERE.
Preparing the Mold
- Sprue printed models on a normal wax base.
- Pour investment slurry into the flask and let it set.
- Place a metal tray inside the kiln on three ½” posts.
- Place the mold on a wire mesh screen on top of the tray. The mold’s sprue holes should be down. The tray will catch melting wax as it drips from the sprue holes.
Info! Keep the kiln’s vent hole(s), if any, open during wax elimination. If the kiln has no vent hole, leave the door open ½”. This allows fumes to escape from the kiln.
- Heat the kiln to 300°F/149°C and hold it at that temperature for at least one hour. Do NOT heat the wax above 300°F/149°C.
- Hold at 300°F/149°C for at least one hour. During this hour, the wax will melt from the mold and drip into the tray.
- After one hour at 300°F/149°C, open the kiln. Remove the mold and wax tray.
- Pour the wax from the tray and leave the tray out of the kiln until your next wax elimination.
- Flip the flask to have the spruce hole facing upwards, allowing fumes to have a clean escape.
- Heat the mold to the temperature recommended by your jeweller's supply house where you purchased the mold material. This is usually around 1350°F/732°C.
Info! Settings are to be used as a reference. It may require adjustment depending on casting conditions.
- Lower the temperature to the casting temperature of the metal. Hold at that temperature until you are ready to begin casting.
- Remove the mold with tongs. Wear protective gloves and safety glasses.
Info! For a better result, one may consider using the double sprue casting process. Directing hot air through one sprue before pouring the material through the other can reduce the ashes and hence giving a better result.