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General Tolerance
(from ASME Y14.5M-2009)
Tolerances can be expressed:
1. directly to a dimension
2. geometric tolerance
3. in a note
4. In a general tolerance block
Limit dimensioning
-The high limit is placed
above the low limit.
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Plus and Minus Tolerancing-The dim. is given first and is
followed by a plus and minus
expression of tolerance.
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Millimeter Tolerances
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A
B
C
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Inch Tolerances
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Tolerances Accumulation
1. Chain Dimensioning, 0.15
2. Base Line Dimensioning, 0.1
3. Direct Dimensioning, 0.05
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Dimensional Limits should
be counted from an origin.
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Limit of size.
MMC (Maximum Material Condition): The condition in which afeature size contains max. amount of material within the limits of
size.
LMC (Least Material Condition)
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Angled Surface
Where defined by a linear dimension and an angle, the surface lie within the tolerance by two
nonparallel planes.
Where a tolerance zone with parallel boundaries is desired, the basic angle can be specified in
rectangle.
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Conical Tapers
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Flat Tapers
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Controlled Radius ToleranceRadius Tolerance