It is the amount of variation allowed for any given dimension to achieve the proper function. In short, tolerance is the deviation of parts in the process of processing, measuring equipment precision because of the impact of the deviation must exist. The difference between these two values (allowable range) is known as the “tolerance”. Therefore, the upper permissible value and the lower permissible value of the upper permissible value relative to the target size are determined based on the use of the metal bar. This size and shape deviation basically fluctuates up and down with the target value as the center. Although the design and fabrication sites have been working to reduce such deviations, they still cannot be controlled to zero. Even if all the bars are intended to be machined into the same shape, not all the bar’s manufacturing accuracy can be machined to exactly 100.00mm because of the size and orientation of the bars.
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