Chapter 5 Straightness Measurements
Aligning the Laser Beam to the Machine’s Travel Path
Measurements Reference Guide 5-23
3 Repeat step 2 until the machine reaches the end of the travel path.
The laser beam is now aligned to the machine’s travel path. Your goal in
the rest of this procedure is to ensure the following:
• One beam enters the interferometer.
• Two beams exit the interferometer and strike the two mirrors in the
reflector equally spaced from the midpoint notches.
• Two beams enter the interferometer from the reflector.
4 While watching the front of the laser head, rotate the interferometer’s
bezel so that two dots overlap each other over the upper port on the laser
head.
5 If you cannot see the dots, follow these steps:
a. In the middle of a piece of paper, cut a round hole the size of the
interferometer’s lens.
b. Place the paper between the reflector and the interferometer, close to
the interferometer so that the beams pass through the hole in the
paper.
Be sure the paper does not block the beam from the interferometer to
the reflector.
You should see either one or two dots on the paper.
c. If necessary, adjust the tilt of the reflector using the two large
micrometer knobs on the back of the reflector’s mounting until the
dots disappear into the interferometer.
d. Remove the paper.
Two dots now appear on the front of the laser head.
e. Slowly turn the interferometer’s bezel until the dots overlap.
6 Adjust the reflector’s tilt until the overlapping dots are centered on the
laser head’s upper port and create a small halo around it.
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