Abstract: A dressing device for attachment to a machine of the type used for dressing, grinding and shaping operations on a wheel, or the like. A collar is attached to the frame or hub of a motor housing through which the spindle for the grinding wheel extends. The frame, or collar, carries a post on which a first slide is adjustably mounted. The first slide carries a bar on which a second slide may be adjustably mounted, and the second slide carries a dressing tool head. The head is turnable on a swivel and has a cam slot which serves as a cam guide for actuation of a dressing unit.