LVDT probes (Linear Variable Displacement Transducer) provide a robust solution for precision production measurements. These units take a given range and provide a measurement based on the capabilities of the analog to digital converter. For example, a probe with a half inch stroke and a 12 bit (4096) A/D converter yields a resolution of 0.000122" or 0.3 microns. Because of their simple design - a steel core in a coil, basically - they withstand the rigors of production life.
The resulting benefits are real-time adjustment of pattern programs that accomodate part variations preventing scalloped or otherwise non-conforming gaskets. These units can also be used to assess (and reject if necessary) parts with missing subassemblies. They can also be used with arrays of parts that will allow a complete array to be processed despite missing array elements.