Bosch GLL 2-50 Professional - Manual (Page 22)

22 | English
1 609 929 S02 | (19.3.09) Bosch Power Tools
– 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 cal-
culated 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 Verti-
cal Line
For this check, a door opening is required with
at least 2.5 metres of space (on a firm surface)
to each side of the door.
– Position the measuring tool on a firm, level
surface (not on a tripod) 2.5 m away from the
door opening. Allow the measuring tool to lev-
el in while in cross-line operation mode, and
direct the laser beams at the door opening.
– Mark the centre of the vertical laser line at
the floor of the door opening (point I), at a
distance of 5 metres beyond the other side of
the door opening (point II) and at the upper
edge of the door opening (point III).
– Position the measuring tool on the other side
of the door opening directly behind point II.
Allow the measuring tool to level in and align
the vertical laser line in such a manner that
its centre runs exactly throught points I
and II.
– The difference d between point III and the
centre of the laser line at the upper edge of
the door opening results in the actual devia-
tion of the measuring tool from the vertical
plane.
– Measure the height of the door opening.
The maximum permitted deviation d
max
is cal-
culated as follows:
d
max
= double height of the door opening
x 0.3 mm/m
Example: With a door opening height of 2 me-
tres, the maximum permitted deviation is
d
max
= 2 x 2 m x 0.3 mm/m = 1.2 mm. Thus, the
marks must not be more than 1.2 mm apart.
2,5 m
2,5 m
2 m
d
OBJ_BUCH-817-004.book Page 22 Thursday, March 19, 2009 12:32 PM