Automatic cylinder profiling gage

An automatic cylinder profiling gage comprising:

• I. a generally cylindrical measuring head adapted to fit into a cylinder being profiled and including;
• centering means for maintaining the head in an approximately centered relationship within the interior of the cylinder,
• a plurality of transducers associated with the head, each transducer including a measuring probe extensible from the surface of the head and adapted to generate a positional signal corresponding to the distance from the head to the interior wall of the cylinder without deforming the interior wall of the cylinder, said transducers disposed in spaced apart relationship so as to substantially simultaneously contact a plurality of points along the length and circumference of said interior wall and substantially simultaneously generate a plurality of positional signals;
• II. a signal processor disposed so as to receive the positional signals from the plurality of transducers, compare said signals with stored values corresponding to positional signals obtained from an ideal cylinder and generate a profile signal indicative of the deviation of the measured cylinder from the ideal cylinder;
• and
• III. display means in operative communication with the signal processor and adapted to receive the profile signal and provide a visual display corresponding thereto.