Milling machine is so widely applied in the manufactures today and here is the errors that occurred in it. One expert proposed that, in order to achieve an ever increasing demand for greater accuracy, a more stringent performance specification in the design process of milling machine should embrace error avoidance, error measurement and error compensation techniques. Moreover, he postulated that the measurement of the repeatable time and spatial errors can allow compensation methods to be applied to the machine for correction of those errors. This is based on the condition that sufficient resolution has been allowed for in the design and that the absolute limit on accuracy for a particular milling machine is set by its measured repeatability figures. Actually, his theory applies to all the cnc machine tools.
He also stated that the three main areas of concern affecting component accuracy are environmental effects, user effects and the machine tool static and dynamic accuracy. He stated that sources of error confined to a 3-axis cnc milling machine are the geometrical inaccuracies, thermally induced errors (causing thermal structure distortion) and the load errors (causing the machine structure to strain and deform). It is also true that the control of the machining errors for a milling machine needs the understanding of the process for peripheral milling and face milling.
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