DeWalt DW089 Instruction Manual page 38

FIG. 7A
2
G
1
F
2
CHECKING 90º ACCURACY BETWEEN VERTICAL BEAMS
(FIG. 8A–8C)
Checking 90º accuracy requires an open floor area at least 33' x
18' (10 m x 5 m). Refer to the graphic for the position of the DW089
at each step and for the location of the marks made at each step.
Always mark the center of the beams' thickness.
TABLE 4
Distance
from A to B
14' (4.0 m)
17' (5.0 m)
20' (6.0 m)
23' (7.0 m)
1. Set up the laser in one corner of the floor and turn on the forward
vertical beam.
FIG. 7B
5
G
H
4
3
Allowable Distance
Between Marks
5/32" (3.5 mm)
3/16" (4.5 mm)
7/32" (5.5 mm)
1/4" (6.0 mm)
2. Mark the center of the beam at three locations (A, B and C) on
the floor along the laser line. Mark (B) should be at the midpoint
of the laser line.
3. Move the laser to mark (B) and turn on both vertical beams.
4. Position the beam crossing precisely at mark B, with the forward
beam aligned with mark (C).
5. Mark a location (D) along the side vertical beam at least 5 m (18')
away from the unit.
6. Rotate the laser over mark (B) so that the forward vertical beam
now passes through mark (D).
7. Mark the location (E) where the side vertical beam passes by
mark (A).
8. Measure the distance between marks (A and E). If the measurement
is greater than the values shown in Table 4, the laser must be
serviced at an authorized service center.
FIG. 8A
18'
(5 M)
38
33' (10 M)