Instruction manual

OPERATING_MANUAL_MC20V.DOC 18.03.11 KS Seite 35
5. Collection of Spoiled Castings
Horizontal Flashing or Finning
Cause Remedy
Incorrect powder / water ratio (too much
water).
Using correct amount of water
(especially important with vacuum
investing machines).
Work time of investment not used up. Ensuring the work time is used up and
slurry temperature is 20 - 22ºC
Other Flashing Or Finning
Cause Remedy
Work cycle too long. Investment
beginning to set while still under vacuum.
Ensuring the work cycle is not too long
and slurry temperature is 20 - 22ºC.
Disturbing the flasks too soon Leave the flasks for at least one hour.
Heating too quickly during de-wax. Do not exceed 150ºC during de-waxing.
Moulds allowed to dry out before burn
out.
If not burning out the same day, keep
moulds wet by covering with wet sacking
or plastic sheets.