This is a MOC Chainsaw, broadly based on their real life counterparts. It's designed to be built from the Lego Creator Robo Explorer Set 31062, and makes use of the track that comes in that set as the chainsaw's 'teeth'. This Moc has working rotation of the Saw's chain, and the left hand side of the chainsaw can be pressed in to activate the light brick to illuminate the chain. The design features the normal handles, and safety features of your typical Chainsaw.
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Help Guide - BI File Types
This MOC also has a 3D digital file available (eg LDD, MPD, etc): 3D Model