11. Place the flask with the opening facing down, so it is easier for the wax to flow out of the cavity during the burnout process.
12. After the burnout process is completed, the flask is ready to be casted.
1) Turn on the EasyCast. Make sure the the air-pressure and Argon (or Nitrogen) gas tank is connected. The LCD display should indicate “ready” status.
2) Check the casting chamber of the machine. Make sure that is clean and the proper flask holder is in place.
3) Make sure that the rotating arm is balanced (follow the instructions in the user manual).
4) Adjust the casting parameters (Acceleration, speed, casting time), using the table in the User Manual of the machine, depending on the casted material. In this particular case, the parameters were set as follows:
- Acceleration: 0.1 Sec
- Rotation: 500rpm
- Casting time: 20 Sec
Note: maximum acceleration is recommended when small platinum parts are casted. The acceleration can be reduced if the casted material is more than 100 g, to prevent from spilling during the initial spinning of the crucible.
5) To optimize for platinum casting, set the emissivity per the table shown in the User manual. For this particular platinum alloy (platinum-rhodium) the emissivity is set to 26%, based on the 30 gr of platinum alloy.
6) For the temperature controller, set to above 2000⁰C. While the melting point for platinum is 1780 ⁰C, the recommended casting temperature for this particular alloy is about 150 degrees higher (~ 1940⁰C). This is needed to slightly overheat the platinum, so it does not start to solidify during the casting cycle. To avoid limiting the temperature below the recommended casting temperature, the temperature setting on the temp. controller needs to be adjusted at above 2000⁰ C (~2100C)