Bosch GLL 2 Professional - Manual (Page 18)

18 | English
1 609 929 W91 | (20.5.10) Bosch Power Tools
– Without changing the height, turn around the
measuring tool by 180°. Direct it against the
wall A in such a manner that the vertical laser
line runs through the already marked point I.
Allow the measuring tool to level in and mark
the cross point of the laser lines on the wall
A (point III).
– The difference d of both marked points I and
III on wall A indicates the actual height devi-
ation of the measuring tool.
The maximum permitted deviation d
max
is calcu-
lated as follows:
d
max
= double distance of the walls x 0.3 mm/m
Example: With a 5 metre distance between the
walls, the maximum deviation must not exceed
d
max
= 2 x 5 m x 0.3 mm/m = 3 mm. Thus, the
marks must not be more than 3 mm apart.
Checking the Levelling Accuracy of the
Horizontal Line
For the check, a free surface of approx. 5 x 5 me-
tres is required.
– Mount the measuring tool between both
walls A and B onto the holder or a tripod, or
place it on a firm and level surface. Allow the
measuring tool to level in.
– At a distance of 2.5 metres from the measur-
ing tool, mark the centre of the laser line
(point I on wall A and point II on wall B) on
both walls.
– Set up the measuring tool 5 metres away
turned by 180° and allow it to level in.
– Align the height of the measuring tool (using
a tripod or by underlaying, if required) in
such a manner that the centre of the laser
line is projected exactly against the previous-
ly marked point II on wall B.
– Mark the centre of the laser line as point III
(vertically above or below point I) on the wall
A.
– The difference d of both marked points I and
III on wall A indicates the actual deviation of
the measuring tool from the level plane.
The maximum permitted deviation d
max
is calcu-
lated as follows:
d
max
= double distance of the walls x 0.3 mm/m
Example: With a 5 metre distance between the
walls, the maximum deviation must not exceed
d
max
= 2 x 5 m x 0.3 mm/m = 3 mm. Thus, the
marks must not be more than 3 mm apart.
d
180°
A B
2,5 m
5,0 m
A
B
2,5 m
d
5,0 m
2,5 m 2,5 m
5,0 m
0 m
A
B
OBJ_BUCH-1236-001.book Page 18 Thursday, May 20, 2010 12:18 PM