IMPORTANT TERMS OF CASTING EXPLAINED !!

1.)AIR GATE – A vertical channel for the removal of gases from the mould;
checking of the filling of the mould cavity with metal and feeding up
the casting with metal during solidification.

2.)BACK DRAFT – Taper or draft which prevents removal of pattern from the
mould.

3.)BINDER – Material used to hold the grains of sand together in moulds or
cores. May be cereal, oil, clay, resin, pitch etc.

4.)BLEED – Molten metal oozing out of a casting stripped or removed from
the mould before solidification.

5.)CAVITY, MOULD or DIE – Impression or impressions in a mould or die
that give the casting its shape.

6.)CHILL – A metal object placed on the outside or inside a mould cavity to
induce more rapid cooling at that point and thereby produce hard zone
i.e., hard, unmachinable surface.

7.)COPE – The upper or top most section of a flask, mould or pattern.

8.)DRAFT – Taper allowed on the vertical faces of a pattern to permit removal
of it from the sand mould without excessive rapping or tearing of the
mould walls.
 
9)DRAG – The lower or bottom section of a mould or pattern.

10.)FLASH – Thin fin or web of metal extending from the casting along the
joint line as a result of poor contact between cope and drag moulds.