20 Questions
What are the three categories of dimensioning mentioned in the text?
Geometric dimensioning, general dimensioning, and surface texture
What is the purpose of Geometric Dimensioning & Tolerancing (GD&T)?
To define features more accurately without increasing tolerances
Why has GD&T increased in practice in the last 15 years according to the text?
Due to the introduction of ISO 9000 standards
What is the system that uses standard symbols to indicate tolerances based on the feature's geometry?
Feature-based dimensioning & tolerancing
In which standard are GD&T practices specified according to the text?
ANSI Y14.5M-1994
What does GD&T stand for?
Geometric Dimensioning and Tolerance
When is GD&T typically used?
When part features are critical to a function or interchangeability
What does MMC stand for in GD&T terminology?
Maximum Material Condition
What is the purpose of the Envelope Principle in GD&T?
To define the size and form relationships between mating parts
What is the purpose of Tolerance in GD&T terminology?
To specify the difference between MMC and LMC limits of a single dimension
Geometric Dimensioning and Tolerancing (GD&T) is a means of dimensioning and tolerancing that considers the function of the part and its function with related parts.
True
ISO 9000 requires not only the requirement of something, but also how it is to be controlled, leading to an increase in the practice of GD&T in the last 15 years.
True
GD&T is sometimes referred to as feature-based dimensioning and tolerancing or true position dimensioning and tolerancing.
True
GD&T practices are specified in ANSI Y14.5M-1994.
True
General dimensioning, geometric dimensioning, and surface texture are the three categories of dimensioning mentioned in the text.
False
GD&T can reduce or eliminate inspection of some features, saving money during production.
True
The Envelope Principle in GD&T allows a variation in form between the least material condition (LMC) and the maximum material condition (MMC) of mating parts.
True
The Maximum Material Condition (MMC) refers to the condition where a size feature contains the maximum amount of material within the stated limits of size.
True
The Basic Dimension in GD&T is the nominal dimension from which tolerances are derived.
True
The Envelope Principle in GD&T states that no portion of the feature may be outside a perfect form barrier at maximum material condition (MMC).
False
Learn about the three categories of dimensioning in applied engineering metrology: general dimensioning, geometric dimensioning, and surface texture. Gain an understanding of geometric dimensioning and tolerancing (GD&T) and its application to angle blocks.
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