Section 13. qxd

0.050
2
0.20
8
0.80
32
3.20
125
12.5
500
0.075
3
0.25
10
1.00
40
4.0
160
15.0
600
0.10
4
0.32
13
1.25
50
5.0
200
20.0
800
0.40
16
1.60
63
6.3
250
25.0
1,000
Table 13.5.4
Preferred Series Maximum Waviness Height Values
mm
in
mm
in
mm
in
0.0005
0.00002
0.008
0.0003
0.12
0.005
0.0008
0.00003
0.012
0.0005
0.20
0.008
0.0012
0.00005
0.020
0.0008
0.25
0.010
0.0020
0.00008
0.025
0.001
0.38
0.015
0.0025
0.0001
0.05
0.002
0.50
0.020
0.005
0.0002
0.08
0.003
0.80
0.030
Section_13.qxd 10/05/06 10:32 Page 13-75

---

13-76
SURFACE TEXTURE DESIGNATION, PRODUCTION, AND QUALITY CONTROL
or other traditional measuring devices having anvils that make contact
with the part. 
Surface quality
controls, on the other hand, serve to limit
the minute surface irregularities or asperities that are formed by the
manufacturing process. These lie under the gage anvils during mea-
surement and 
do not use up tolerances.
QUALITY CONTROL (SIX SIGMA)
Quality control is a system that outlines the policies and procedures
necessary to improve and control the various processes in
manufacturing that will ultimately lead to improved business
performance.
Six Sigma
is a quality management program to achieve “six sigma”
levels of quality. It was pioneered by Motorola in the mid-1980s and
has spread to many other manufacturing companies. In statistics,
sigma refers to the standard deviation of a set of data. Therefore,