Rockwell Automation 5370-CVIM2 Module - Manual (Page 255)

5 Chapter Chapter 7
Inspection Tools
7–17
Figure 7.17 shows an arc gage using the wedge angle operation to measure a
“wedge” angle formed by two edges (“features”) on the arc gage and the
implied center of the gage.
Figure 7.17 Example: Measuring the Wedge Angle
Feature A
Feature B
Wedge
The wedge angle operation always measures the angle from feature A on the
gage clockwise to feature B. In the example, feature A is located at 315
°
relative to the X–axis, and feature B is located at 45
°. Thus, the wedge angle
is about 90
° in this example. (If the positions of features A and B were
reversed, the wedge angle would be about 270
°.)
Chord Angle (Arc and Circle Gage Only)
This gage operation is available for arc and circle gages using either the
binary gaging mode or the gray scale gaging mode. The chord angle
operation measures the absolute orientation of the chord formed between two
edges (features A and B) on an arc gage. The value is reported in degrees and
is measured clockwise from the origin (the 0
° position of the X–axis).
Feature A is located on the X–axis and is the center of rotation.
Figure 7.18 (page 7–18) shows an arc gage using the chord angle operation
to measure the angle between a chord across the arc gage and the X–axis. In
this example, with feature A located on the X–axis, feature B is rotated about
22
° clockwise from the X–axis. If the positions of features A and B were
reversed, the chord angle would be about 202
°.