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