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Bosch GLL 3-50 Manual

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16 | English
1 618 C00 99J | (10.10.13) Bosch Power Tools
Checking the Levelling Accuracy of the Horizontal Line
For the check, a free surface of approx. 5 x 5 metres is re-
quired.
– Set up the measuring tool on a firm, level surface between
both walls A and B. Allow the measuring tool to level in
while in horizontal operation.
– At a distance of 2.5 metres from the measuring 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 previously
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 calculated as follows:
d
max
= double distance of the walls x 0.3 mm/m
Example: With a 5 metre distance between the walls, the max-
imum deviation must not exceed
d
max
=2x5mx0.3mm/m=3mm. Thus, the marks must not
be more than 3 mm apart.
Checking the Levelling Accuracy of the Vertical Line
For this check, a door opening is required with at least 2.5 m
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 level 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 m 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 through points I and II.
–The difference d between point III and the centre of the la-
ser line at the upper edge of the door opening results in the
actual deviation of the measuring tool from the vertical
plane.
– Measure the height of the door opening.
The maximum permitted deviation d
max
is calculated as follows:
d
max
= double height of the door opening
x0.3mm/m
Example: With a door opening height of 2 metres, the maxi-
mum 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
,0 m
5,
5
A
B
d
2,5 m
A
B
2,5 m
2,5 m
2 m
d
OBJ_BUCH-1973-002.book Page 16 Thursday, October 10, 2013 4:45 PM
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