CNC lathe machining accuracy is the actual size of the surface of the machined part

February 28, 2023

The machining precision of CNC lathe is the degree of conformity between the three geometric parameters of the actual size, shape and position of the surface of the machine after machining and the ideal geometric parameters required by the drawings. Machining accuracy and machining tolerance are terms used to evaluate the geometric parameters of the machined surface. The ideal geometrical parameters are the average dimensions for the dimensions; for the surface geometry, they are absolute circles, cylinders, planes, cones, and straight lines; for the mutual position between the surfaces, they are absolutely parallel. , vertical, coaxial, symmetrical, etc. The deviation of the actual geometric parameters of the part from the ideal geometric parameters is called the machining error. The actual parameters obtained by any processing method are not absolutely accurate. From the function of the parts, as long as the machining error is within the tolerance range required by the part drawing, it is considered that the machining accuracy is guaranteed. The machining accuracy is measured by the tolerance level. The smaller the grade value, the higher the accuracy. The machining error is represented by a numerical value. The larger the value, the larger the error. High machining accuracy means that the machining error is small and vice versa.
Machining accuracy includes three aspects: a positional accuracy refers to the degree to which the actual position between the relevant surfaces of the part after machining is in accordance with the ideal position. b Dimensional accuracy refers to the degree to which the actual size of the machined part meets the tolerance of the part size. c shape accuracy refers to the degree to which the actual geometry of the surface of the finished part conforms to the ideal geometry.

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