Manufacturing method of small sized turbine

This invention is a manufacturing method of small turbine. The procedures are that first proper points on turbine small end conical surface are selected and big excircle is clamped by three claws and big end face is done to plane. Secondly, central hole is tipped by core clamper and big end face is tipped by sleeve, then outer circle is grinded. Thirdly, outer circle is clamped by three claws clamping chuck, welding face is turned. The consistency of small end excircle and passage can be furthest ensured by the above selecting to meet the reference coincidence principle. Reference unification of subsequent processing position is realized, and the central hole used to position in following procedures id processed, so the affection of quality central migration bring from the non concentric of the outer circle and passage and the product discard brought from subsequent processes non precise in traditional technique is effectively avoided. So the passing percent is raised to more than 95%.