Bosch GLL 2 Professional Operations Instructions download pdf (Page 18)

18 | English

1 609 929 W91 | (20.5.10) Bosch Power Tools

– 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 indicates the actual height devi-

ation of the measuring tool.

The maximum permitted deviation d

max

is calcu-

lated as follows:

max

= double distance of the walls x 0.3 mm/m

Example: With a 5 metre distance between the

walls, the maximum deviation must not exceed

max

=2x5mx0.3mm/m=3mm. Thus, the

marks must not be more than 3 mm apart.

Checking the Levelling Accuracy of the

Horizontal Line

For the check, a free surface of approx. 5 x 5 me-

tres is required.

– Mount the measuring tool between both

walls A and B onto the holder or a tripod, or

place it on a firm and level surface. Allow the

measuring tool to level in.

– At a distance of 2.5 metres from the measur-

ing 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 previous-

ly 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

– 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 calcu-

lated as follows:

max

= double distance of the walls x 0.3 mm/m

Example: With a 5 metre distance between the

walls, the maximum deviation must not exceed

max

= 2 x 5 m x 0.3 mm/m = 3 mm. Thus, the

marks must not be more than 3 mm apart.

180°

2,5 m

5,0 m

2,5 m

5,0 m

2,5 m

5,0 m

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Bosch GLL 2 Professional Operations Instructions Page 18

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