Positioning tool for machining lower top peg through surface grinding machine

A positioning tool for a surface grinding machine to machine a lower top peg relates to the technical field of positioning tools and comprises a support, a rotary table, a positioning key and the lower top peg, the rotary table is arranged on the support, the positioning key is arranged on the top surface of the rotary table, and the lower top peg is fixedly connected with the rotary table through a bolt drilled from the bottom surface of the rotary table. After a workpiece is positioned through the positioning key and fastened through the screw rod, the workpiece is rotated by a certain angle, so that a machined surface is parallel to the working table surface of the grinding machine and is adsorbed on the working table by utilizing a large surface at the bottom of the support, and a worker directly grinds after setting a tool, so that the problem that a surface grinding machine cannot machine large and small inclined surfaces of the lower top peg is solved. 一种平面磨床加工下顶栓用定位工装，涉及定位工装技术领域，包括支座、转台、定位键以及下顶栓，所述转台设