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7 PLTW Engineering - Tolerances
1.Traits of Tolerances: - Variation is unavoidable
-No two manufactured parts are identical - some degree of variation will exist -Used in production drawings to control the manufacturing process and control the variation between copies of the same part -In particular, they are applied to mating parts in an assembly -One advantage in using these is that interchangeable parts can be used 1 / 2
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2.Large Tolerances: - May affect functionality of part
-Specify tolerances to ensure proper function
3.Small Tolerances: - Will affect the cost of the part
-Cost generally increases with these -Will require precise manufacturing -Will require quality control with inspection and rejection of parts
4.ANSI/ASME Standard Y14.5: Each dimension shall have a tolerance, except
those dimensions specifically identified as reference, maximum, minimum, or stock. The tolerance may be applied directly to the dimension or indicated by a general note located in the title block of the drawing.
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