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Model
5528A
Straightness and Squareness
Consi derations
21·8
l
..
-.
.1
\
..-\
0,
\
\
\
,
'0
-
-
- -
-
-
i
- -
0,
t
-
-
MACHINE
TOOL
AXtS
OPTICAL
AXIS
0,
-
SLOPE OF THE
OUT-OF-
STRAIGHTNESS
DATA ALONG AXIS
1.
02"'"
SLOPE OF
THE OUT· OF-STRAIGHTNESS DATA ALONG AXIS
2.
TOTAL ANGLE BETWEEN AXtS
1 & 2
-
goa
+
02
-
0,
+
OPTICAL SQUARE
ERROR
SQUARENESS
-
82
-
0,
+
OPTICAL
SQUARE
ERROR
Figure
21
·
1,
Squareness
Squareness Sign Conventions
When making
a single
Straightness
measu
rement,
you
need not
worry
about
the
sign
convention
used,
o ther than
to
relate positive
values
to one direction of
the machine
tool's
movement.
However,
when
you are
making
a Squareness measu rement.
the
sign
convention is
critical
in
making
sure you have
the
correct sign and
magnitude
of
the
Squarcness
error.
Figure 21-1 shows how 10 obtai
n
a
square ness va
lu
e. This
is
the
sa
me procedure the
HP
Dimensional Metrology
Ana lysis System
uses to define
squa reness.
Determining Sign Conventions
To determine
Ihe sign
conventions
for
Stra
igh tness and Squa reness,
1.
Draw the
Squareness
measurement
you
are
going to take.
Identify
which
direction along
each of the
two
Straightness
measurcment paths
wi
ll
be "into"
the
square and
which
direction
wil
l
be
"O
UI
"
of
the
sq uare (See Figu re
21·2).
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