Manual Bosch GLL 3-50 Professional (page 17 of 245) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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English | 17

Bosch Power Tools 1 609 92A 0KM | (19.11.14)

– 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

max

is calculated as

follows:

max

= double height of the door opening

x 0.3 mm/m

Example: With a door opening height of 2 metres, the maxi-

mum permitted deviation is

max

= 2 x 2 m x 0.3 mm/m = 1.2 mm. Thus, the marks must

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.

– 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 cen-

tre of the lower laser point is on the point II which has al-

ready 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: 5mx±0.6mm/mx2=±6mm.

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)

With the measuring plate 26, it is possible to project the laser

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 in-

tense sunlight. The brightness intensification can be seen on-

ly when viewing, parallel to the laser beam, onto the measur-

ing plate.

2,5 m

2 m

5 m

180°

OBJ_BUCH-1973-003.book Page 17 Wednesday, November 19, 2014 8:19 AM

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Bosch GLL 3-50 Professional Manual

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