Introduction / Context:
Clear lettering ensures that dimensions, tolerances, and notes are unambiguous. Drafting standards specify not just content but also presentation, including recommended lettering styles for readability and consistency. The prompt claims letter shapes are not described by standards; we must evaluate this.
Given Data / Assumptions:
- Standards aim to reduce misinterpretation.
- Lettering affects legibility on screen and in printed plots.
- Many organizations adopt standard fonts or lettering styles.
Concept / Approach:
Standards such as ISO 3098 and ASME Y14-related documents provide guidance for lettering size, line thickness ratios, and character forms to ensure legibility after reduction or reproduction. Company drafting manuals often echo these rules for CAD text styles and plotted outputs.
Step-by-Step Solution:
Recall that standards specify minimum text heights for different sheet sizes and scales.Recognize prescribed character shapes or recommended sans-serif forms that reproduce well.Apply these in CAD through text styles that match standard criteria.Therefore, the claim that shapes are not described is incorrect.
Verification / Alternative check:
Check any corporate CAD standard: it references letter height, font, and spacing compatible with international standards.
Why Other Options Are Wrong:
Correct: Would deny well-documented lettering specifications.Applies only to ISO, not ASME / True for CAD text only: Both ISO and ASME acknowledge lettering requirements; tool does not exempt them.
Common Pitfalls:
Using decorative fonts that plot poorly or reduce legibility at small scales.Ignoring minimum text height leading to unreadable notes on prints.
Final Answer:
Incorrect
Discussion & Comments