505.839.3010
Neutec/Rio Grande™ J-2
r
Rev. F
Page 9-4
Rotate the flask if necessary to improve the vacuum.
If the vacuum is still less than 21 inches/Hg,
remove the flask and replace the flange
gasket or clean the sealing face of the flange
on the flask before proceeding.
7. Swing the flask chamber back under the
crucible chamber and rotate the lifting cam
lever to the right. This will lift and lock the
flask chamber against the crucible chamber.
Close and secure the flask chamber.
8. Time the flask insertion to allow 10–20
seconds for the nitrogen gas to replace
the air in the mold cavity before set-point
temperature is reached and casting occurs.
Casting the Flask
1. When the metal is molten and within
a few degrees of set-point temperature,
rotate the stirring rod lever several times
to stir the alloy.
Important! Never attempt to stir
the metal before it is well above its melting
temperature. Any solids remaining in the
crucible may dislocate the sealing rod and
cause molten metal to leak.
Rotate the stirring rod to stir the molten alloy.
2. At the moment the metal reaches the
casting set-point, squeeze the sealing
rod handle for five seconds. This lifts
the sealing rod and allows the molten
metal to flow into the flask.
Squeeze the handle to cast the metal.
3. Release the sealing rod handle.
4. Rotate the sealing rod adjusting knob three
times to seat the sealing ball against the
bottom of the crucible for the next cast.
