A locator and clamping means, for accurately locating and securing a workpiece onto the flat workplate or bed of a machining tool wherein the bed is of the type having a plurality of spaced grooves with one set disposed at right angles to another set, consists of jig into which the workpiece is secured and which has a flat surface wherein three accurately positioned non-aligned holes are located and consists of dowels removably secured within said respective holes and protruding therefrom. In addition, three apertured keys are slidably disposed within the grooves in the bed so that each key is capable of receiving one dowel. To facilate the insertion of each dowels into a respective aperture, the dowels are tapered and each aperture in the respective key is congruent to the taper. Then, when the three dowels engage the three keys, the jig and, in turn, the workpiece is acturately positioned on and secured to the bed.