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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

25

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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

23 23

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Flat Tapers

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Controlled Radius ToleranceRadius Tolerance