Abstract: A modular fixturing apparatus is provided for locating, orienting and holding a workpiece during a machining operation, having a workpiece specific mounting plate and a carrier apparatus provided with stop means and pusher means for accurately and reproducibly positioning the mounting plate on the carrier. The workpiece specific mounting plate has a workpiece specific pattern of threaded holes adapted to attach locating, clamping and supporting devices to hold the workpiece during the machining operation. Accurate, reproducible location and orientation of successive workpieces of the same geometry on the apparatus for the same machining operations is achieved quickly and positively. Reconstruction of the fixturing apparatus to hold subsequent workpieces of the same geometry in the same location and orientation is also readily achieved.