Green Sand Casting III

Returning the next day to attempt to make this cast work several slight changes were made:

• The pattern was smoothed to remove a slight undercut;
• The cope was packed harder than previously; and,
• The packing was performed as several layers across the base of the cope rather than filling the void first then filling the rest of the cope.

This seemed to work.
Sprue and vent holes were added to allow the metal to flow to the now empty void and to act as risers, showing when the mould is full.

Adding a spue hole to the cope

Cutting a channel from the sprue to the pattern

Sprue hole and funnel sit atop a reassembled mould box

 Once the channels are cut the mould is reassembled taking extra care not to damage the protruding mould face. The mould is then ready to pour. Unfortunately we didn't use enough metal and the aluminium didn't completely fill the void. Oh well, better luck next time.

Incompletely poured button mushroom cap. The rim is supposed to form a circle