10
• The casting ring arm should then be balanced out with the weights. Loosen the star-shaped nut (Fig. 4,
Pos. 17) and by turning the balancing weights (Fig. 4, Pos. 16) on the spindle, balance out the casting arm.
Re-tighten the star-shaped nut and remove the casting ring. This adjustment is usually carried out before the
actual melting process has begun.
Caution The star-shaped nut must be securely tightened! Otherwise the casting arm or
machine itself may become damaged during the casting procedure.
6.2 Starting the melting process
Once the casting arm has been correctly balanced and the wax pattern in the casting ring has been entirely
burned out, the actual melting procedure may begin.
iNote The hot casting ring can either be placed into the casting chamber directly before the melting
procedure is started or after the metal in the crucible has been melted (pre-heating function).
This prevents the casting ring from cooling down too much. It is advisable to pre-heat the alloy
if larger amounts of metal are to be melted.
iNote When melting gold-colored precious alloys, use a ceramic crucible with a graphite insert. When
melting silver-colored precious alloys, use only the ceramic crucible. This also applies to
palladium base alloys. Vitrify the crucible with melting powder prior to use.
iNote The potentiometer „HEATING“ (Fig. 3, Pos. 13), for the heat rate and the duration of the pre-
heating function must be adjusted individually for each type and amount of metal alloy so that
the melting does not occur entirely to 100% during pre-heating.
• Turn the potentiometer „HEATING“ (Fig. 3, Pos. 13) to choose the melting degree required. Select the power so
that, depending on which metal alloy is to be melted, the process takes less than one minute but more than 30
seconds. If there is a large amount of metal to be melted, then the process may take longer than
60 seconds. If a graphite crucible is in use within the ceramic crucible, reduce the heating power considerably so
that the graphite crucible may heat up slowly and therefore melt the precious metal gently.
• Select the spinning duration with the alloy selection switch „GOLD/OTHER ALLOYS“(Fig. 3, Pos. 10). When
„GOLD“ is selected, the spinning time increases. When „OTHER ALLOYS“is selected, the machine runs at maxi-
mum acceleration strength and the spinning time is reduced.
• Position the casting arm over the induction coil until an acoustic signal can be heard.
• Press the „START“ button (Fig 3, Pos. 12) to raise the induction coil.
• Close the casting chamber lid, the melting process begins and the melting display „HEATING“ (Fig. 3, Pos. 9)
lights up.
• Observe the melting metal by looking through the protective glass. When the metal is almost completely
molten, the casting ring can be inserted.
• Place the hot casting ring into the insert (Fig. 4, Pos. 21) using suitable tongs and clamp securely.
• Once the lid is closed, the melting process continues immediately. It is possible to turn the potentiometer for
heating (Fig. 3, Pos. 13) up or down during the melting process to correct the efficiency.
iNote The melting process can be stopped by pressing the red „STOP“ button (Fig. 2, Pos. 6) (see also
chapter 6.6).
Caution Fire Hazard! Very high temperatures can be reached during the melting process in the
casting chamber.
