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SESK: Stuff Everyone Should Know · sesk.info/eng-gdt-design-intent

What is the main purpose of geometric dimensioning and tolerancing?

GD&T communicates allowable geometric variation and design intent with standardized symbols and rules.

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  1. To give only the nominal sizes
  2. To list the machining steps
  3. To communicate controlled geometric variation ✔

Why: GD&T specifies how form, orientation, and location may vary while a part remains acceptable. It helps designers, manufacturers, and inspectors interpret the same requirements.

Huh, didn't know that: A datum establishes a reference from which geometric relationships can be controlled and measured.

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The drawing set boundaries because it had tight tolerances.
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References

Answer: To communicate controlled geometric variation. GD&T specifies how form, orientation, and location may vary while a part remains acceptable. It helps designers, manufacturers, and inspectors interpret the same requirements.

  1. ASME Y14.5 Dimensioning and Tolerancing www.asme.org/codes-standards/find-codes-standards/dimensioning-and-tolerancing
    It establishes symbols, rules, definitions, requirements, defaults, and recommended practices for stating and interpreting GD&T
    Checked 2026-10-10.

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