Difficulty: Easy
Correct Answer: Incorrect
Explanation:
Introduction / Context: Numeric precision on a drawing carries meaning. The number of decimal places often implies tolerance per a general note or standard block. Careless use drives unnecessary cost or creates ambiguity, resulting in nonconforming parts.
Given Data / Assumptions:
Concept / Approach: Choose decimal places to match functional needs and realistic process capability. Overly tight precision inflates cost and scrap; overly loose precision risks poor fit or function. Apply geometric tolerances for form, orientation, and location where necessary.
Step-by-Step Solution:
Determine functional requirements and fit with mating parts.Select decimal places and associated tolerances per drawing standards or notes.Use GD&T where needed to control features critical to performance.Verify process capability aligns with specified tolerances before release.Verification / Alternative check:
Discuss with suppliers or manufacturing engineers; confirm that tolerances are achievable and economical.Why Other Options Are Wrong:
Correct: Suggests ignoring precision, which undermines quality.Only critical dimensions need decimals / CAD defaults choose decimals: All dimensions must intentionally reflect needed precision; defaults are starting points, not rules.Common Pitfalls:
Using excessive precision everywhere, driving cost.Failing to define datums and positional tolerances for assemblies.Final Answer:
Incorrect
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