Bosch GLL 2 Professional Original Instructions Manual page 19

OBJ_BUCH-1236-001.book Page 19 Thursday, May 20, 2010 12:18 PM
Checking the Levelling Accuracy of the
Vertical 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. Direct the laser beams at
the door opening and allow the measuring
tool to level in.
– 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.
Bosch Power Tools
– 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 deviation of
the measuring tool from the vertical plane.
– Measure the height of the door opening.
The maximum permitted deviation d
lated as follows:
d = double height of the door opening
max
x 0.3 mm/m
Example: With a door opening height of 2 me-
tres, the maximum permitted deviation is
d = 2 x 2 m x 0.3 mm/m = 1.2 mm. Thus, the
max
marks must not be more than 1.2 mm apart.
Working Advice
Always use the centre of the laser line for
marking. The width of the laser line changes
with the distance.
Attaching with the Holder
To fasten the measuring tool on the holder 8,
screw the locking screw 9 of the holder into the
1/4" tripod mount 2 on the measuring tool and
tighten. To rotate the measuring tool on the
holder, slightly loosen the screw 9.
With the holder 8, the measuring tool can be at-
tached as follows:
– Mount the holder 8 to the tripod 18 or a com-
mercially available camera tripod via the 1/4"
tripod mount 13. For fastening to a commer-
cially available construction tripod, use the
5/8" tripod mount 14.
– The holder 8 can be fastened to steel parts
via the magnets 12.
– The holder 8 can be fastened to drywalls or
wood walls with screws. For this, insert
screws with a minimum length of 50 mm into
the screw holes 10 of the holder.
– The holder 8 can also be fastened to pipes or
similar beams using a commercially available
strap by threading it through the opening 11
for strap attachment.
Working with the Tripod (Accessory)
A tripod offers a stable, height-adjustable meas-
uring support. Place the measuring tool via the
tripod mount 2 onto the 1/4" male thread of the
tripod and screw the locking screw of the tripod
tight.
1 609 929 W91 | (20.5.10)
English | 19
is calcu-
max