Pyrites

Galena

Blends

Bauxite

Copper 90%, lead 5%, tin 5%

Copper 94%, lead 4%, tin 2%

Copper 88%, zinc 2%, tin 10%

Copper 85%, lead 5%, zinc 5%, tin 5%

Aluminium

Gunmetal

Brass

Bronze

G.I sheet

Copper sheet

Steel sheet

Aluminium sheet

To maintain the tension

To decrease the tension

Keep the belt centralised

Allow free rotation of pulley