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PLTW Engineering – Tolerances QUESTIONS AND ANSWERS 100% CORRECT | LATEST UPDATE 2025
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PLTW Engineering – Tolerances QUESTIONS ANDANSWERS 100% CORRECT | LATEST UPDATE
2025
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 - ANSWER 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.
Tolerances - ANSWER An acceptable amount of dimensional variation that will
still allow an object to function
correctly.
Three basic tolerances that occur most often on
working drawings are ______________. - ANSWER - Limit dimensions
- Bilateral tolerance
- Unilateral tolerance
Limit Dimensions - ANSWER - Provide an upper limit and lower limit
for the dimension.
- Any size between or equal to the upper limit and/or lower limit is allowed
- The upper limit dimension is 0.126
- The lower limit dimension is 0.125
Bilateral Tolerance - ANSWER - Provides an equal allowable variation, larger
and smaller
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