An involute grinding wheel dresser comprising a base and an arm pivotally mounted on said base for movement about a pivotal axis. A slide is mounted on the arm by anti-friction means for movement transversely of the arm. A dressing tool is mounted on the slide and interengaging means are provided between the base and the slide and are operable to limit movement of the slide with respect to the arm, as the arm is swung about the pivotal axis, in a direction such that the tool moves radially outwardly as well as tangentially to define an involute curve.
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