Bosch GLL 3-50 Professional Original Instructions Manual page 17

OBJ_BUCH-1973-005.book Page 17 Tuesday, September 13, 2016 3:06 PM
– 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
lows:
d = double height of the door opening x 0.3 mm/m
max
Example: With a door opening height of 2 metres, the maxi-
mum permitted deviation is
d = 2 x 2 m x 0.3 mm/m = 1.2 mm. Thus, the marks must
max
not be more than 1.2 mm apart.
Checking plumb accuracy
For this check, a free measuring distance of approx. 5 m be-
tween floor and ceiling on a firm surface is required.
– Mount the measuring tool onto the rotating platform and
place it on the floor.
– Switch the measuring tool on and allow it to level.
Bosch Power Tools
– Mark the centre of the upper crossing point on the ceiling
(point I). Also mark the centre of the bottom laser point on
the floor (point II).
– Rotate the measuring tool 180°. Position it so that the
centre of the lower laser point is on the point II which has
already been marked. Allow the measuring tool to level.
Mark the centre of the upper laser point (point III).
– The difference d of both marked points I and III on the ceil-
ing results in the actual deviation of the measuring tool to
the plumb line.
In the measuring distance of 5 m the maximum permissible
deviation is: 5 m x ±0.6 mm/m x 2 = ±6 mm.
The difference d between the points I and III can therefore be
at most 6 mm.
Working Advice
 Always use the centre of the laser line for marking. The
width of the laser line changes with the distance.
Working with the Measuring Plate (Accessory)
(see figures G–H)
is calculated as fol-
With the measuring plate 26, it is possible to project the laser
max
mark onto the floor or the laser height onto a wall.
With the zero field and the scale, the offset or drop to the re-
quired height can be measured and projected at another loca-
tion. This eliminates the necessity of precisely adjusting the
measuring tool to the height to be projected.
The measuring plate 26 has a reflective coating that enhances
the visibility of the laser beam at greater distances or in
intense sunlight. The brightness intensification can be seen
only when viewing, parallel to the laser beam, onto the meas-
uring plate.
English | 17
5 m
d
180°
1 609 92A 1YV | (13.9.16)