A machine mould pattern is a type of pattern used in the sand casting process. It is created using a CNC machine, which allows for extremely precise and complex patterns to be produced quickly and efficiently. A high-pressure moulding line (HPML) pattern is a type of pattern used in the foundry industry to create sand moulds for casting metal parts. The HPML pattern is typically made from a combination of wood and metal materials and is designed to withstand the high pressures used in the HPML process.