Bosch GTL 3 Professional Notice Originale page 18

OBJ_BUCH-828-006.book Page 18 Friday, July 1, 2016 12:52 PM
18 | English
– Position the measuring tool (without turning it) at a dis-
tance of 5 m so that the crossing point of the laser lines
is on the already marked point II and that the 0° laser
line runs through the point III.
Mark the 45° laser line at a distance of 5 m (Point IV).
– Turn the measuring tool by 45° so that the centre of the
0° laser line runs through the point IV.
The crossing point of the laser lines must still be on the
point II.
Mark the 45° laser line at a distance of 5 m as point V.
– Turn the measuring tool by 45° so that the centre of the
0° laser line runs through the point V.
The crossing point of the laser lines must still be on the
point II.
Mark the 45° laser line at a distance of 5 m as point VI.
1 609 92A 1Z2 | (1.7.16)
– Turn the measuring tool by 45° so that the centre of the
0° laser line runs through the point VI.
The crossing point of the laser lines must still be on the
point II.
– Mark the centre of the 45° laser line at a distance of
5 m 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 ad-
missible 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.
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