Positioning tool for lathe

The utility model relates to the technical field of shaft positioning devices, and provides a positioning tool for a lathe, which comprises a rotating disc used for being clamped by a three-jaw chuck; the positioning plate is eccentrically arranged on the end face of the rotating disc; the positioning core is arranged on the positioning plate; the pressing piece is arranged on the rotating disc in a sliding mode, and the pressing piece is close to or away from the positioning plate after sliding; according to the technical scheme, the problem that corresponding special tools need to be replaced when different sizes or types of irregular shafts are replaced for punching in the prior art is solved. 本实用新型涉轴件定位装置技术领域，提出了一种车床用定位工装，包括转动盘，用于被三爪卡盘夹紧；定位板，偏心设置在所述转动盘的端面上；还包括定位芯，设置在所述定位板上；压紧件，滑动设置在所述转动盘上，所述压紧件滑动后靠近或远离所述定位板；通过上述技术方案，解决了现有技术中不同尺寸或类型不规则轴换轴打孔，需要更换相应的专用工装的问题。