Chapter 5 Straightness Measurements
Aligning the Laser Beam to the Machine’s Travel Path
5-22 Measurements Reference Guide
Aligning the Laser Beam to the Machine’s
Travel Path
Before using the following instructions, make sure the turret ring on the
laser head is set to OTHER and the small opening is in place over the
upper aperture.
To align the laser beam to the machine’s travel path, follow these steps:
1 Attach a target to the moving optic.
• If the interferometer is the moving optic, attach the round target to
the side of the interferometer facing the laser head so the beam passes
through the target’s hole.
• If the reflector is the moving optic, remove the interferometer. Then,
attach the rectangular target to the side of the reflector facing the
laser head.
2 While watching the two dots on the reflector’s surface, move the moveable
optic away from its initial position.
As you move the optic, the two dots in the reflector’s slot separate
(Figure 5-10). Your goal is to make sure that (1) they remain in the plane
of the midpoint notches on the reflector, and (2) both dots remain at an
equal distance from the center of the slot.
• If the two dots on the reflector’s surface begin to move out of this
pattern, tilt the laser head vertically or rotate it left or right to adjust
the dots to their correct position.
• If you are using a retroreflector and the beam moves out of the
alignment ring on the retroreflector’s surface, translate the laser head
vertically and horizontally until the beam passes through the
alignment ring.
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