CNC milling tolerances are the measurement of small-to-large dimensional differences that are allowed or prohibited in a machining operation. Tolerances describe the size of an object, such as a drill bit, compared to its specified dimension. The lower the tolerance, the smaller the size difference between two pieces
The process of reducing or increasing a machine's accuracy relies on knowing how much variation is acceptable in a part's dimensions. This is determined by calculating how much material must be removed or added during production and establishing tolerances for every step of production.
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