Traditional Culture Encyclopedia - Traditional culture - Is there a difference between positive and negative tolerances and upper and lower tolerances in cad? Can the upper and lower deviations of dimensions be marked casually?
Is there a difference between positive and negative tolerances and upper and lower tolerances in cad? Can the upper and lower deviations of dimensions be marked casually?
1. There is no positive or negative tolerance, and the tolerance is always positive.
2. There is no upper and lower tolerance, only upper and lower deviation.
3. Tolerance is equal to the upper deviation minus the lower deviation.
4. The up-and-down deviation of the size can't be marked casually. The upper deviation value is "large" and the lower deviation value is "small".
For example, 30(-0.025, -0.05), tolerance = -0.025-(-0.05)= 0.025.
30 0.025, tolerance = 0.025-(-0.025)= 0.05.
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