Precision Engineering and Practice
There are three terms often used in precision practices and they are often used incorrectly or in a vague manner. The terms are accuracy, repeatability, and resolution. Because the present discussion is on machining and fabrication methods, the definitions will be in terms related to machine tools. However, these terms have applicability to metrology, instrumentation, and experimental procedures, as well.
Precision engineering deals with many sources of error and its solution. Precision is the most important think in the manufacturing field. Machining is the important part of manufacturing process. Many factor like feedback variables, machine tool variables, spindle variabls,wokpice vaiabls,envronmantal effect thermal errors etc.. affect the accuracy of machine. Main goal of precision engineering is to reduce the uncertainty of dimensions. Achieve the exact dimension is vary difficult . So tolerance is allowed on work piece.
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