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Bosch GLL 3-80 P Professional Manual

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English | 15
Bosch Power Tools 1 609 92A 0KK | (7.5.14)
– Align the height of the measuring tool (using a tripod or by
underlaying, if required) in such a manner that the cross
point of the laser lines is projected against the previously
marked point II on the wall B.
– 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
results in the actual height deviation of the measuring tool
alongside the lateral axis.
On the measuring distance of 2 x 5 m = 10 m, the maximum
allowable deviation is:
10 m x ±0.2 mm/m = ±2 mm.
Thus, the difference d between points I and III must not ex-
ceed 2 mm (max.).
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 vertical operation with
automatic levelling, and direct the laser beam 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).
– Rotate the measuring tool by 180° and position it on the
other side of the door opening directly behind point II. Al-
low 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.
– Mark the centre of the laser line at the upper edge of the
door opening as point IV.
– The difference d of both marked points III and IV results
in the actual deviation of the measuring tool to the plumb
line.
– Measure the height of the door opening.
The maximum admissible deviation is calculated as follows:
Doubled height of the door opening x 0.2 mm/m
Example: For a door-opening height of 2 m, the maximum de-
viation may be
2 x 2 m x ±0.2 mm/m = ±0.8 mm. Consequently, points III
and IV may be no more than 0.8 mm (max.) apart from each
other.
A
B
A
B
d
d
180°
2,5 m
2,5 m
2 m
d
OBJ_BUCH-907-003.book Page 15 Wednesday, May 7, 2014 1:39 PM
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