PLTW Engineering – Tolerances Exam Study Guide.

PLTW Engineering – Tolerances Exam Study Guide. Traits of Tolerances - answer- 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 Large Tolerances - answer- May affect functionality of part - Specify tolerances to ensure proper function Small Tolerances - answer- 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 ANSI/ASME Standard Y14.5 - answerEach 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.