un término bastante usado por los técnicos

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Note added at 20 hrs (2008-05-25 23:08:14 GMT)
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http://en.wikipedia.org/wiki/Tolerance_(engineering)
Mechanical component tolerance
Dimensional tolerance is related to, but different from fit in mechanical engineering, which is a designed–in clearance or interference between two parts. For example, if a shaft (or bolt) with a nominal diameter of 10 mm is to have a sliding fit within a hole, the shaft might be specified with a tolerance range from 9.964 to 10 mm and the hole might be specified with a tolerance range from 10.04 mm to 10.076 mm. This would provide a clearance fit of somewhere between 0.04 mm (largest shaft paired with the smallest hole) and 0.112 mm (smallest shaft paired with the largest hole). In this case the size of the tolerance range for both the shaft and hole is chosen to be the same (0.036 mm), but this need not be the case in general.

When designing mechanical components, standardized tolerances are often used. The standard (size) tolerances are divided into two categories: hole and shaft. They are labeled with a letter (capitals for holes and lowercase for shafts) and a number. For example: H7 (hole tapped hole or nut) and h7 (shaft or bolt). H7/h6 is a very common standard tolerance which gives a rather tight fit, but not so tight that you can't put the shaft in the hole, or turn the nut on the bolt, by hand. The tolerances work in such a way that for a hole H7 means that the hole should be made slightly larger than the base dimension (in this case for an ISO fit 10+0.015-0, meaning that it may be up to 0.015 mm larger than the base dimension, and 0mm smaller). The actual amount bigger/smaller depends on the base dimension.


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Note added at 20 hrs (2008-05-25 23:27:35 GMT)
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These instruments are calibrated to a certain tolerance and a constant is assigned to each individual. viscometer. Experimenters can use the time required ...
rothfus.cheme.cmu.edu/tlab/visc/projects/t6_s03/t6_s03.pdf - Páginas similares


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Note added at 21 hrs (2008-05-25 23:59:00 GMT)
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TOLERANCIA, LUZ, O SEPARACIÓN CONO/PLACA