Abstract: A grinding machine for continuous descaling, cleaning and polishing of steel wire and the like employs a plurality of grinding wheels which are self-adjusting for wear and self-trimming so that no manual adjustment or trimming is required for the life of a wheel. The wheels are made of an open-pore resilient abrasive material and canted with respect to the workpiece to provide more effective descaling than that provided by prior art grinding machines. Guides are employed to align and straighten the workpiece as it is moved past the grinding wheels.