Difficulty: Easy
Correct Answer: Correct
Explanation:
Introduction / Context:
Dimensions on a technical drawing define the target, or nominal, size of each feature. In real manufacturing processes, machines, materials, and measurement systems introduce small deviations. Modern drafting standards anticipate these deviations and control them using tolerances so that parts remain functional and interchangeable even when they are not exactly the nominal size.
Given Data / Assumptions:
Concept / Approach:
The essential concept is tolerance: an allowable range around the nominal dimension. If a hole is specified as 10.00 with ±0.05, any measured value from 9.95 to 10.05 is acceptable. Tolerances reflect design intent, fit (clearance/interference/transition), function, and economical manufacturability. Geometric tolerances further control form, orientation, location, and runout beyond simple size limits, ensuring performance under assembly and operating conditions.
Step-by-Step Solution:
Verification / Alternative check:
Cross-check with functional gages or GO/NO-GO plugs for holes and snap gages for shafts to confirm fit-based acceptance without relying solely on numeric readings.
Why Other Options Are Wrong:
“Incorrect” ignores the entire system of tolerancing. “Any deviation indicates nonconformance” contradicts the purpose of tolerances. Limiting variation to wood or prototypes is arbitrary and not standards-based; tolerances apply to all materials and production phases.
Common Pitfalls:
Misreading title-block default tolerances, assuming bilateral when limits are unilateral, or ignoring temperature effects on measurements.
Final Answer:
Correct
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