Rotational Parallelism Measurements - HP 5528A User Manual

Model 5528A
Para lle lism Measuremen ts
14-6
ROTATIONAL PARALLELISM MEASUREMENTS
Th is type of measurement is used to determine the parallelism between a lathe's spind le axis and
its too l's travel path. Two Straightness measurements are made, with the Straightness Reflector
he ld in the lathe's spind le; the spind le (and Reflector) are rotated 180 degrees between the first
and second measurement, o therwise the two measuremen ts arc the same.
STRAIGHTNESS
REFLECTOR
A. TYPICAL PARALLELISM
CONFIGURATION
STRAIGHTNESS
INTERFEROMETER
STRAIGHTNESS REFlECTOR
B. FIRST MEASUREMENT PATH
TURNING
MIRROR
r..-_ LASER HEAO
_ _ --,, 8,- P" I NDLE AXIS
MEASUREMENT AXIS
SPINDLE AND
STRAIGHTNESS REFLECTOR
ROTATED 180
0
MEASUAEMEttT AXIS
_ _ ---' 8 ::. P .:; 1 N 0 LE AX IS
"
C. SECOND MEASUREMENT PATH
PARAllELISM ERROR EQUALS THE ANGULAR DISPLACEMENT BETWEEN THE
TOOLPOST TRAVEL AXIS AND THE SPINDLE AXIS . THIS IS OBTAINED BY COM-
PUTING 0, AND 02; THEN TAKING 112 THEIR ALGEBRAIC SUM .
Figure 14-3.
ROlational Parallelism
Measuremellls