By ASM International
Will give you an simply understood, precious reference of recent tools for nondestructive overview and statistical research. With the aid of 1,100 illustrations and one hundred fifty tables, you are going to easy methods to decide upon, use, and interpret nondestructive equipment for comparing the standard of components and assemblies. the elemental ideas of every process besides its corresponding features are defined in 23 separate articles.
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The CMM can also store the results of all prior inspections of a given part or parts so that a complete history of its production can be reconstructed. This same capability also provides the groundwork for all statistical process control applications. Part programs can also be easily edited, rather than completely rewritten, to account for design changes. When a dimension or a feature of a part is changed, only that portion of the program involving the workpiece revision must be edited to conform to part geometry.
However, instruments have also been introduced for industrial process control. One application is in the primary metals industries and consists of measuring length in a unidirectional flow process. The laser Doppler velocity gage is a non-contact instrument that uses laser beams and microprocessors to measure the speed and length of a moving surface. It can measure almost any type of continuously produced material without coming into contact with it, whether it is hot, cold, soft, or delicate. It outputs various types of measurements, such as current speed, average speed, current lengths, and total length.
Their limitation, however, is the size of part they can conveniently handle, because the part to be measured must fit under the structural member from which the probe descends. In an attempt to overcome this limitation, various designs have been produced. As a result, within the overall category of vertical CMM, there are designs utilizing moving or fixed bridges, cantilevers, gantries, and so on. Each design approach is of course a compromise, because as the size of the work envelope of the machine and the travel distance along the axes increase, so also do the problems of maintaining rigidity and accuracy.
ASM Handbook. Nondestructive Evaluation and Quality Control by ASM International