User manual

Appendix I
ZCast Design Guide - 24
 Make sure that geometries are properly shelled. Almost all molds are capable of having
‘sacrificial’ outer surfaces that can be removed to allow for even baking and proper gas
dispersion during the pouring process (see below).
 Make certain that if the mold has a core that the core is properly vented to the
atmosphere to allow unimpeded release of gas.
 For situations where large surface area to volume ratio geometries are present (i.e., thin
wall mold geometries), skillfully design vents so that gas can readily escape from the
large surface area. It is worth noting that these molds are the most challenging
geometries for ZCast because the user must ensure adequate mold ventilation while also
ensuring mold strength with thin wall geometry.
WARNING
Thin mold geometries can prevent proper mold ventilation
during molten metal casting leading to the unexpected release
of entrapped gases and molten metal causing personal injury.
Design vents to avoid gas entrapment in thin mold geometries.
Ensure venting paths in the mold are arranged and directed
away from the metal path to avoid entrapment of gases.