pneumatic tool - machine powered by an air motor driven by compressed air. Pneumatic power is used to drive a wide range of tools, both those requiring rotary motion, such as drills, and those requiring reciprocating motion, e.g., hammer s and chisels. Pneumatic tool lubricants are generally the same types as those for compressors; however, the percussion forces in some pneumatic tools may demand special lubricants with EP proper ties. See EP additive, rock drill lubricant.