Device for examining the precision of a circular path which is to be executed by a working spindle

A device, supported on a machine table, for examining a precision of motion of a working spindle of an NC-controlled machine tool along a circular path for producing circular cylindrical surfaces on a workpiece, the device comprising:

• a first device part for coaxial mounting to the working spindle;
• a second device part for positioning on the machine table to receive the workpiece, the workpiece being processed coaxially with respect to an axis of the circular cylindrical surface being produced thereon;
• an electronic measuring value sensor which extends radially with respect to an axis of the working spindle and with respect to the axis of the circular cylindrical surface, said sensor being hinged to said first device part and to said second device part;
• a shaft encoder rotatably disposed in said second device part and coaxial to the axis of the circular cylindrical surface, said encoder determining an angular position of said measuring value sensor;
• and
• means for holding said measuring value sensor on one of said first and said second device parts to adjust and fix said sensor transversely to the axis of the working spindle and to the axis of the circular cylindrical surface.