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Chapter 11 Diagonal Measurements
Installing and Aligning the Optics on the Machine
4
Observe the measurement beam dot as you move the machine to increase
the distance between the interferometer and the measurement
retroreflector along the body diagonal.
Continue moving the interferometer and measurement retroreflector until
the moving dot disappears or until the end of travel is reached, whichever
occurs first. If the dot disappears before end of travel is reached, return
the interferometer to the last position at which you saw the dot.
Movement of the measurement beam dot indicates that the measurement
beam was not perfectly aligned to the work zone body diagonal. If the dot
moves, perform steps 5 through 9 below.
5
Slightly rotate the beam steering mirror to move the measurement return
dot back to the laser head's return port. You may also have to make a
slight adjustment of the knob on the bottom of the mirror tray to do this.
6
Move the machine to return the measurement retroreflector and the
interferometer to their close-together position.
7
If necessary, reposition the measurement retroreflector so its return dot
overlaps the dot from the reference retroreflector attached to the
interferometer. (If you removed the reference retroreflector earlier, you
should re-attach it now.)
8
If necessary, slightly translate the laser head, without turning it, so the
overlapping dots are over its lower (return) port.
9
Repeat steps 3 through 9 to verify satisfactory alignment, indicated by
both dots remaining stationary on the laser head's return port as the
measurement optics are moved through the entire measurement travel
range.
10
When the alignment is satisfactory:
a. Tighten all adjustment locks to keep settings from changing.
b. Repeat steps 3 through 8, to be sure nothing has changed.
11-30
Measurements Reference Guide
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