Abstract: An apparatus for stopping the movement of a lathe cutting tool at a precise spot along a workpiece has a rugged support bracket for mounting securely to the guide track of a moving carriage which bears the tool. A micrometer-adjustable stop member disposed at one end of the bracket interacts with a rotatable turret stop, having multiple interchangeable stop members, located at the opposite end to achieve precise and rapid positioning of the multiple stops. A particular embodiment is suitably configured for lathes with dovetail-bed-type guide tracks.