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CHECKING 90º ACCURACY BETWEEN THE 2 VERTICAL BEAMS
5. Rotate the cross
laser clockwise
so that the
forward laser
beam passes
through marks
b1 on the table,
and b2 on wall B.
6. Mark the center
of the side
a2
vertical beam at
2 locations. Point
c1 on the table
near the cross
laser, and point
c2 on wall C.
7. Rotate the cross
laser clockwise
so that the
forward laser
beam passes
through marks
c1 on the table,
and c2 on wall
C.
8. Mark the center
a2
of the side
vertical beam at
2 locations.
Point d1 on the
table near the
cross laser, and
point d2 on
wall D.
ENGLISH
A
B
b2
90°
C
b1
a1
c2
D
c1
A
B
b2
90°
b1
C
a1
c2
d2
D
c1
d1
9. Rotate the cross
laser clockwise
so that the
forward laser
beam passes
through marks
d1 on the table,
and d2 on wall D.
10. Mark the center
of the side
a4
vertical beam at
a2
2 locations. Point
a3 on the table
near point a1,
and point a4 on
wall A near
point a2.
11. Measure the distances:
∆1= from a1 to a3
∆2= from a2 to a4
12. The diff erence ∆2 – ∆1 should be no more than 4 mm.
A
B
b2
90°
C
b1
c1
a1
c2
a3
d2
D
d1
12
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