Instruction manual

OPERATING_MANUAL_MC20V.DOC 18.03.11 KS Seite 38
Rough Surfaces
Cause Remedy
Rough waxes. Use less release agent on the rubbers.
Can be caused by excess talc.
De-wax temperature too hot. Do not exceed 150ºC during de-wax.
Steam de-waxed for too long. Steam, de-wax for a maximum of 1 hour.
Steam will erode surface of the
investment.
De-waxed too quickly. Leave flask for at least 1 hour to achieve
maximum strength before de-waxing
Flasks overheated during burn out. Ensure maximum burn out temperature
does not exceed 730ºC.
Metal too hot. Reduce casting temperature.
Inclusions
Cause Remedy
Improper sprues. Eliminate sharp corners in sprue system.
Crucible break down. Replace crucible. Do not used old,
disintegrating crucibles.
Dirty metal. Do not use more than 50% recycled alloy
and ensure it is clean
Flasks overheated during burn out. Ensure maximum burn out temperature
does not exceed 730ºC.