Modern power tools, automated machine tools, and human-operated power machinery complicate the definition of "machine" greatly. Machines used to transform heat or other energy into mechanical energy are known as engines.

The grinding machine consists of a power driven grinding wheel spinning at the required speed and a bed with a fixture to guide and hold the work-piece.

A Grinding Machine is a machine tool used for producing very fine finishes or making very light cuts, using an abrasive wheel as the cutting device. This wheel can be made up of various sizes and types of stones, diamonds or of inorganic materials. For machines used to reduce particle size in materials processing see grinding.

A Drilling Machine is used for foundation construction in the building industry, or for drilling water or oil wells. Drilling Machine are classified on the basis of their constructional features, or the type of work they are required to do.

Different parts of drilling machine are Chassis, Power Unit, Rig Mast, Kelly and Drill Bit.