Metallurgy

ASM Handbook. Nondestructive Evaluation and Quality Control by ASM International

By ASM International

Offers you an simply understood, invaluable reference of recent equipment for nondestructive evaluate and statistical research. With the aid of 1,100 illustrations and one hundred fifty tables, you are going to how one can decide upon, use, and interpret nondestructive tools for comparing the standard of elements and assemblies. the elemental ideas of every process besides its corresponding functions are defined in 23 separate articles.

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1 Elements of a CMM showing typical digital position readout. The probe is positioned by brackets slid along two arms. Coordinate distances from one point to another are measured in effect by counting electronically the lines in gratings ruled along each arm. Any point in each direction can be set to zero, and the count is made in a plus or minus direction from there. Once repeated hits or readings have been made and stored, they can be used in a variety of ways through the computer and geometric measurement software of the CMM.

The first major component to examine is the overall construction of the machine. The CMM must be rigidly built to minimize errors introduced by unintended movement between the machine members and in their movement along the axes of travel. Some designs (such as the cantilever) require a more massive structure to provide the same degree of rigidity than do others (such as the gantry type) that have more inherent rigidness. If the CMM is to operate in the shop, the user should select a design having the same toughness and shielding as a machine tool.

Once these factors have been considered, the CMM buyer should assess the characteristics and capabilities of the following major components of the CMM. Base/Bed Construction. The first major component to examine is the overall construction of the machine. The CMM must be rigidly built to minimize errors introduced by unintended movement between the machine members and in their movement along the axes of travel. Some designs (such as the cantilever) require a more massive structure to provide the same degree of rigidity than do others (such as the gantry type) that have more inherent rigidness.

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