Method of machining turbine components using a reference surface

A method of repairing a turbine component including a first hardface structure and a second hardface structure, the method comprising:

• positioning the turbine component within a system including a machining tool;
• determining a first distance between a surface of the first hardface structure and a datum surface formed in the turbine component;
• removing the first and second hardface structures from the turbine component;
• coupling a third hardface structure to the turbine component and a fourth hardface structure to the turbine component;
• machining a surface of the third hardface structure using the machining tool, wherein machining the third hardface structure surface comprises controlling movement of the machining tool using the datum surface as a reference, such that the machined third hardface structure surface is located the first distance from the datum surface;
• and
• machining, using the machining tool, a surface of the fourth hardface structure to a second distance measured between the machined third hardface structure surface and the machined fourth hardface structure surface.