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29 Cards in this Set
- Front
- Back
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What year was the new GDT system introduced?
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1956
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T or F:
Any increase in dimensional or form accuracy reduces tolerance buildup in the overall assembly. |
True
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What three basic pieces of information does the Feature Control Symbol contain?
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1. Feature Characterisitc symbol
2. Datum reference 3. Tolerance value |
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What is the heart of GDT?
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The Feature Control Symbol
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What does this symbol define?
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Profile of a Line
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What does this symbol reference?
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Angularity
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What does this symbol reference?
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Basic Dimension
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What does this symbol reference?
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Circularity
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What does this symbol reference?
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Concentricity
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What does this symbol reference?
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Cylindricity
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What does this symbol reference?
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Datum Point
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What does this symbol reference?
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Datum
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What does this symbol reference?
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Circularity
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What does this symbol reference?
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Straightness
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What does this symbol reference?
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Flatness
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What does this symbol reference?
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Perpendicularity
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What does this symbol reference?
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Paralellism
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What does this symbol reference?
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True Position
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What does this symbol reference?
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Circular Runout
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What does this symbol reference?
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Datum Target
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What does this symbol reference?
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Diameter
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What does this symbol reference?
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Least Material Condition
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What does this symbol reference?
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Maximum Material Condition
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What does this symbol reference?
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Profile of a Surface
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What does this symbol reference?
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Projected Tolerance Zone
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What does this symbol reference?
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Reference Dimension
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What does this symbol reference?
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Total Runout
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What are the 5 simple rules that should always be applied in GDT?
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1. When a tolerance of size is specified, that tolerance controls both size and form.
2. When position or datums of size are specified, modifiers must be specified 3. When form/orientation is specified, the modifier "regardless of feature size" is implied. 4. For screw threads, splines, and gears, the tolerance and datum reference originate from the pitch cyclinder axis. 5. A virtual condition exists for features of size and datum features of size. (Virtual condition is the worst acceptable condition of a feature). |
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Refer to Chapter 8 and page 9. What are the callouts?
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See Figure 2.
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