Sand casting

Expendable Mold Casting

Pattern is permanent

Pattern making

Materials:

Properties:low cost, low weight, easy formability, less dimensional changes, surface finishSize of casting, number of casting, dim. accuracy

• Wood: pine, teak, walnut• Metal: aluminium alloys, grey cast iron, steel• Plastic: poly urethine foam

Types of patterns

• Single piece pattern• Split pattern• Gated pattern• Cope and drag Pattern• Match plate pattern• Loose piece pattern• Follow board pattern• Sweep pattern• Skeleton pattern

Single , Split, type

Match plate & Drag and cope type

In sketch:

Follow board pattern