Manual Chapter 5

5-32 Using UltraSpec Alignment - General Overview

Tolerance Example

Tolerance Chart (2000 to 3500 RPM)

The chart above shows the Angle and Offset for a machine that operates at

2000 – 3500 RPM plotted together. A pure angle reading of 0.45 Mils/Inch

and a pure Offset reading of 2.5 Mils are marked by the arrows. These read-

ings are clearly in the acceptable range when looked at individually. How-

ever, look what happens when these two “acceptable” reading are plotted

together. The two lines connect outside the acceptable range. This illus-

trates the importance of looking at the Offset and Angle together when

establishing speciﬁed tolerances.

Excellent

Acceptable

Offset (mils)

Angle (mils/inch)

12 3

0.25

0.50