Bosch GPL 3 Professional User Manual

Page 11

English | 11

Bosch Power Tools

1 609 929 S08 | (13.3.12)

– Without turning the measuring tool, position it close to wall

B. Switch the measuring tool on and allow it to level in.

– Align the height of the measuring tool (using the tripod or

by underlaying, if required) in such a manner that the cen-

tre point of the laser beam is projected exactly against the

previously marked point II on wall B.

– Rotate the measuring tool by 180° without changing the

height. Allow it to level in and mark the centre point of the

laser beam on wall A (point III). Take care that point III is

as vertical as possible above or below point I.

– The difference d of both marked points I and III on wall A

indicates the actual height deviation of the measuring tool.

On the measuring distance of 2 x 20 m = 40 m, the maximum

allowable deviation is: 40 m x ±0.3 mm/m = ±12 mm.

Thus, the difference d between points I and III may not ex-

ceed 12 mm (max.).
Checking the Vertical Levelling Accuracy
For this check, a free measuring distance of approx. 5 m be-

tween floor and ceiling on a firm surface is required.
– Draw a straight line on the ceiling.

– Mount the measuring tool to the holder or a tripod. Switch

the measuring tool on and rotate it in such a manner that

the bottom plumb beam can be seen on the floor.

– Position the measuring tool in such a manner that the up-

per plumb beam points against the line on the ceiling. Al-

low the measuring tool to level in. Mark the centre of the

upper laser point on the line on the ceiling (point I). Also,

mark the centre of the laser point on the floor (point II).

– Rotate the measuring tool by 180°. Position it in such a

manner that the centre of the bottom laser point is direct-

ed on the already marked point II and the upper laser point

is directed against the line on the ceiling. Allow the meas-

uring tool to level in. Mark the centre of the upper laser

point on the line on the ceiling (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.

On the measuring distance of 2 x 5 m = 10 m, the maximum

allowable deviation is:

10 m x ±0.3 mm/m = ±3 mm.

Thus, the difference d between points I and III must not

exceed 3 mm (max.).

Working Advice

Always use the centre of the laser point for marking.

The size of the laser point changes with the distance.

Attaching with the Holder
To fasten the measuring tool on the holder 8, screw the lock-

ing screw 9 of the holder into the 1/4" tripod mount 6 on the

measuring tool and tighten. To rotate the measuring tool on

the holder, slightly loosen the screw 9.
– Rotate the measuring tool on the holder 8 sideward or to-

ward the rear to make the bottom plumb beam visible.

– Rotate the measuring tool on the holder 8 to project

heights with the horizontal laser beam.

With the holder 8, the measuring tool can be attached as

follows:
– Mount the holder 8 to the tripod 18 or a commercially

available camera tripod via the 1/4" tripod mount 13. For

fastening to a commercially 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 60 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.

180˚

5 m

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