Handleiding Bosch GTL 3 Professional (pagina 20 van 277) (Nederlands, Duits, Engels, Frans, Italiaans, Portugees, Spaans, Pools, Turks, Deens, Zweeds, Noors, Fins)

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20 | English

1 609 92A 0L0 | (16.5.14) Bosch Power Tools

– Mark the centre of the 45° laser line at a distance of

5m as point VII as near as possible next to the point I.

–The difference d of the two points VII and I is the actu-

al deviation of the 0° laser line and the 45° laser line.

The measuring length 4 x 5 m = 20 m has a maximum

admissible deviation of: 20 m x ±

0.4 mm/m* = ±8 mm.

Therefore, the maximum difference d between the points

I and VII may be 8 mm or less.

* The value ±0,4 mm/m results from the angle accuracy

0.2 mm/m plus a possible uncertainty of 0.2 mm/m

while turning.

Working Advice

 Always position the measuring tool flat on the floor

or fix it flat on the wall. In case of uneven positioning

or fixing, the angle is smaller than 45° and 90°.

 Always use the centre of the laser line for marking.

The width of the laser line changes with the distance.

 Never use the laser lines that the measuring tool

standing on the floor projects on the wall for align-

ment. The measuring tool is not self-levelling. There-

fore, the line on the wall is distorted.

 The reference point for the alignment of tiles is the

crossing point P of the laser lines directly in front of

the measuring tool. In order to mark an angle, the

measuring tool has to be turned at this crossing

point, see figure F.

 Position the measuring tool only on a clean levelling

plate 10. The measuring tool cannot stand level on an

uneven, soiled levelling plate surface, which could lead

to faulty measuring results.

Working with the levelling plate (see figures D–E)

Using the levelling plate 10 you can position the measur-

ing tool flat on an uneven or unstable floor.

The levelling plate 10 can also be used as a wall bracket

for the measuring tool. Fix the levelling plate (securing it

against slipping) on a wall or an inclined surface using e. g.

standard screws. Use a level to fix the levelling plate flat

on the surface.

Positioning of the measuring tool on the levelling

plate: Position the measuring tool with the magnets 4 on

the underside on the levelling plate 10. The line grid on

the upper side of the levelling plate facilitates the precise

positioning of the measuring tool. In order to mark 90° or

45° angles, position the levelling plate at a reference edge

or a projection on a wall and position the measuring tool

as illustrated on the upper side of the levelling plate.

Working with the laser target plate/ceiling measure-

ment plate (see figure A)

The laser target plate 9 or the ceiling measurement plate

14 improves the visibility of the laser beam under unfa-

vourable conditions and at longer distances.

The reflective part of the laser target plate 9 improves the

visibility of the laser line. Thanks to the transparent part,

the laser line is also visible from the back side of the laser

target plate.

The ceiling measurement plate 14 (accessory) can also

be used for marking the laser lines. Like the laser target

plate, it has a reflective and a transparent part.

Laser Viewing Glasses (Accessory)

The laser viewing glasses filter out the ambient light. This

makes the red light of the laser appear brighter for the

eyes.

 Do not use the laser viewing glasses as safety gog-

gles. The laser viewing glasses are used for improved

visualisation of the laser beam, but they do not protect

against laser radiation.

 Do not use the laser viewing glasses as sun glasses

or in traffic. The laser viewing glasses do not afford

complete UV protection and reduce colour perception.

Work Examples

Checking right angles (see figure A)

Position the measuring tool in one corner of the room and

position it so that the 0° laser line runs parallel to the ref-

erence line (e.g. wall). Measure the distance between the

laser line and the reference line directly at the measuring

tool and at the longest possible distance from the measur-

ing tool. Align the measuring tool so that both distances

are identical.

Then measure at at least two different points the distanc-

es between the 90° laser line and the wall. If the distances

to the 90° laser line are identical, the walls are at the right

angle.

OBJ_BUCH-828-004.book Page 20 Friday, May 16, 2014 1:02 PM

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