Abstract: A referencing member capable of generating an oscillating magnetic field is placed at the inside surface of a layup mandrel. A locating member, comprising a plurality of spaced electrical coils is placed on the other side of the layup mandrel. By energizing the reference member to create the oscillating magnetic field, the effect of the field on the coils can be used to sense position of the locating member and thus determine a reference location on the outside surface of the mandrel. Thus, production components of a structure being fabricated can be properly located.

Abstract: During machine tool operation a first set of sensors, referred to as cutter deflection sensors, provides data which is representative of the physical deflection of the cutting tool from a rest position, while a second set of sensors, referred to as position sensors, provides data which is representative of the position of the workpiece mounted on the machine tool relative to a reference or setpoint position. The cutter deflection and workpiece position data are combined to produce a resultant which is representative of the actual position of the cutting tool relative to the workpiece. This resultant is then compared with reference data which is representative of the desired position of the cutting tool relative to the workpiece. The difference between the actual and desired positions is then compared with a preselected tolerance value.