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[0] Pinion Shaft [1] 1 [2] 1 [4] Steel [5] Relatively cheap, steel is needed due to its strength and durability. Plastic is not recommended here. [6] Steel is first extruded and secondly given teeth. Ends forged for strength [7] Necessary for the desired properties of this part. Relatively cheap. [3] 
Takes the energy provided by the motor and distributes it to the saw blade. Transfers energy through the use of gears.
Gate 3 - Group 15 - 2012 - GICL Wiki