Bosch Professional GLL 3-50 Manual Original página 18

18 | English
line at the door opening and allow the measuring tool to
level in.
– Mark the centre of the vertical laser line on the floor of the
door opening (point Ⅰ), 5 m away on the other side of the
door opening (point Ⅱ) and on the upper edge of the door
opening (point Ⅲ).
– Rotate the measuring tool 180° and position it 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 way that its centre passes through
points Ⅰ and Ⅱ exactly.
– Mark the centre of the laser line on the upper edge of the
door opening as point Ⅳ.
– The discrepancy d between the two marked points Ⅲ and
Ⅳ reveals the actual vertical deviation of the measuring
tool.
– Measure the height of the door opening.
You can calculate the maximum permitted deviation as fol-
lows:
Doubled height of the door opening × 0.3 mm/m
Example: At a door opening height of 2 m, the maximum de-
viation amounts to
2 × 2 m × ±0.3 mm/m = ±1.2 mm. The points Ⅲ and Ⅳ
must therefore be no further than 1.2 mm from each other.
1 609 92A 92E | (28.09.2023)
Checking Plumb Accuracy
For this check, you will need a clear measuring space on firm
ground with a distance of approx. 5 m between the floor and
the ceiling.
– Mount the measuring tool onto the rotating platform (16)
and place it on the floor. Select vertical mode with auto-
matic levelling and allow the measuring tool to level in.
5 m
– Mark the centre of the top point of intersection of the
laser lines on the ceiling (point Ⅰ). Also mark the centre of
the plumb point on the floor (point Ⅱ).
d
– Turn the measuring tool by 180°. Position it so that the
centre of the plumb point falls onto the marked point Ⅱ.
Allow the measuring tool to level in. Mark the centre of the
top point of intersection of the laser lines (point Ⅲ).
– The discrepancy d between the two marked points Ⅰ and
Ⅲ on the ceiling reveals the actual deviation of the meas-
uring tool from the vertical plane.
You can calculate the maximum permitted deviation as fol-
lows:
Doubled distance between floor and ceiling × 0.6 mm/m
Example: At a floor-to-ceiling distance of 5 m, the maximum
deviation amounts to
2 × 5 m × ±0.6 mm/m = ±6 mm. The points Ⅰ and Ⅲ must
therefore be no further than 6 mm from each other.
Working Advice
Only the centre of the laser point or laser line must be
u
used for marking. The size of the laser point/the width of
the laser line changes depending on the distance.
180°
Bosch Power Tools