At the same time, manufacturing accuracy will mean that you may end up with some holes at 2.6 mm.Īdding a lower limit of -0 mm and an upper limit of +0.3 mm guarantees that all the holes will be between 2.8 and 3.1 mm in diameter. To ensure that only the smaller ones, all of them, will actually fall through the holes while keeping the larger ones on the sift, you can set the nominal value for the hole diameter as 2.8 mm. ![]() The smaller ones are in the range of 2.3…2.7 mm. The larger pieces of rocks vary in size between 3.3 mm and 3.7 mm. You want the smaller pebbles to fall through the holes while keeping the larger ones on the sift. ![]() Let’s say you are designing a sieve to separate 3.5 mm pebbles from 2.5 mm pebbles. In mechanical engineering, we are mainly talking about tolerances that apply to linear, angular and other physical dimensions.īut regardless of the unit, a tolerance states an acceptable measurement range from the base point (nominal value). For example, the working conditions may have tolerances for temperature (° C), humidity (g/m 3), etc. Tolerances can apply to many different units. VI Why Tolerance Matters & Where to Use It? What Is Tolerance in Engineering?Įngineering tolerance is the permissible variation in measurements deriving from the base measurement.
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