Reading Assignment
Recommended Reading
- Interpretation of Geometric Dimensioning and Tolerancing (book preview)
- Fundamentals of Geometric Dimensioning and Tolerancing (book preview)
- Emachineshop.com – GD&T (Website)
- SME GD&T Video Series (YouTube Playlist)
Outline
Introduction to Dimensioning
Dimensioning Standards
- ASME Y14.5-1994
- ISO (multiple standards)
GD&T advantages
Rule #1
- Two Sides of Rule #1
- Allows variation in form
- Prohibits variation in form
Table Design Example
Fundamental Rules
Units of Measurement
Applications of Dimensions
General Tolerancing
Limit Dimensions
Plus/Minus Dimensions
- Unilateral
- Bilateral
- Bilateral Symmetric
Example
Feature Control Frame
Basic Dimension
Datum Identifiers
- Planar Datums
- Axis Datums
- Partial Surface Datums
- Datum Targets
- Datum Simulators
Datums
Material Condition Modifiers
- MMC
- LMC
- RFS
Form Controls
- Straightness
- Circularity
- Flatness
- Cylindricity
Orientation Controls
- Parallelism
- Perpendicularity
- Angularity
Profile Control
- Profile of a line
- Profile of a surface
Runout
- Circular Runout
- Total Runout
Location Controls
- Concentricity
- For dynamic balancing, spinning parts
- Position
Combinational Control
- E.g., Runout and Profile
Examples
