GC EUROPE Fujivest Super - Manual (Page 36)

36
Cause Remedy
- Incomplete elimination of pattern materials - Heat soak longer at the recommended
temperature, ensure that the furnace is
correctly vented and calibrated
- Insufficient heating of the alloy/melt too
cold
- Increase casting temperature of alloy,
preheat the crucible, check the alloy
manufacturer’s data
- Investment mould too cold during casting - Transfer investment mould to casting
machine and cast at once
- Casting machine operated with insufficient
pressure or too few turns
- Increase casting pressure; use more turns
- Misalignment of crucible and sprue hole - Position investment mould with sprue hole
aligned with crucible
- Insufficient amount of alloy by weight - Calculate the correct amount based upon
the wax weight
- Patterns improperly sprued ,Wax-up too
thin, wrong position of casting objects
- Review the pattern & sprueing system
6
Incomplete castings & rounded cervical edges