WorksheetsIED 2.1.1 Tolerate This - Review
Total questions: 3
Worksheet time: 9mins
Independent Review Notes: Tolerance Formats
Because variation in manufacturing is unavoidable, engineers must specify an acceptable range of variation for dimensions. This range is called tolerance. Tighter tolerances require more precise manufacturing and measurement equipment, which increases cost. Designers must balance precision and cost, tightening tolerances only on dimensions that are critical for function.
Tolerance can be shown on drawings using three common formats:
Unilateral tolerance
Allows variation in only one direction (larger or smaller than the specified dimension). Plus (+) and minus (–) values are not equal or may appear on only one side.Bilateral tolerance
Allows equal variation in both directions from the specified dimension. A ± symbol is used to show the same allowable increase or decrease.Limit dimensions
Show the maximum and minimum allowable size directly as two values. The part must be manufactured between these limits.
Tolerance can also be represented as a single value, calculated by subtracting the lower limit from the upper limit. This value represents the total permissible variation for that dimension.
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Scoring Guide (10 points per question)
9–10 points: Accurate, clear explanation using correct tolerance terminology.
7–8 points: Mostly correct explanation with minor missing details.
5–6 points: Partial understanding; explanation is vague or incomplete.
3–4 points: Limited understanding; key concepts are missing or incorrect.
0–2 points: Incorrect, unrelated, or no response.
Yes
Yes
Why do engineers avoid using tight tolerances on every dimension of a part?
Describe the difference between unilateral tolerance, bilateral tolerance, and limit dimensions.
