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1
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.
2
Plus and Minus Tolerancing
-The dim. is given first and is
followed by a plus and minus
expression of tolerance.
3
Millimeter Tolerances
4
A
B
C
Φ25
5
Inch Tolerances
6
Tolerances Accumulation
1. Chain Dimensioning, ±0.15
2. Base Line Dimensioning, ±0.1
3. Direct Dimensioning, ±0.05
7
Dimensional Limits should
be counted from an origin.
8
Limit of size.
•MMC (Maximum Material Condition): The condition in which a
feature size contains max. amount of material within the limits of
size.
•LMC (Least Material Condition)
9
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.
10
Conical Tapers
Φ23 Φ23
11
Flat Tapers
12
Controlled Radius ToleranceRadius Tolerance