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5526A
Appendix B: Measurement
Considerations
APPENDIX B
MEASUREMENT CONSIDERATIONS
LASER SYSTEM MEASUREMENTS
To fully characterize machine geometry,
you
need to measure
-
•
The
six
degrees of freedom for
each measurement
axis, -
•
Squareness
between measurement
axes, and
-
•
Parallelism between measurement
axes.
The
six
degrees
of
freedom
are
-
1.
Linear displacement
2.
Angular
displacement
about
the measurement
axis
-
a.
Pitch
b.
Yaw
c.
Roll
3.
Displace
ment perpendicular
to
the measurement
axis
-
a.
Straightness
in the
vertical
plane
b.
Straightness
in the horizontal
plane.
These six variables are
used to break down the
complex
movements
of a carriage
traveling
on
a
pair of ways
into
factors which
ca
n be more easily handled
.
(See
Figure
B-
1,)
--
HO
RI
ZO NTAL
ST
RA IGHTNESS
X AXtS
LIN
EAR
D
ISPLACEM
ENT
Figure
B-1.
Six Degrees
of
Freedom
B-1
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