Abstract:With the aid of fixture, plane and drilling machining can be arranged on a lathe,then lathe processing ability can be give full play, turn order time can be reduced, machining efficiency can be improved. Fixture was used to control the relative position of the part and lathe, the fixture precision was used to ensure parts processing precision. Plane processing was 5 points positioning, v-shaped block was used as clamping mechanism. Drilling was 6 points positioning, screw thread was used as clamping and connection. Fixture body was designed circular, easy to install on the lathe chuck triangle.