Thimble finish machining method for machining turbine blade blank of gas turbine

The invention discloses an ejector pin finish machining method for machining a turbine blade blank of a gas turbine, which comprises the following steps of: 1, clamping a turbine blade precision casting blank with an ejector pin boss by using a self-centering vice; 2, the clamping body is conveyed to a three-coordinate measuring machine for three-coordinate detection before machining; 3, clamping the clamping body on a numerical control machine tool; 4, according to the position relation between the top points of the conical surfaces of the ejector pin holes set according to two theories on the turbine blade precision casting blank in the self-centering vice coordinate system, the ejector pin holes of the ejector pin boss are machined; 5, the turbine blade precision casting blank is fed into a three-coordinate measuring machine to be machined and then subjected to three-coordinate detection; and 6, comparing the molded line data of the same detection cross section before and after machining, and evaluating wh