Bosch GTL 3 Professional Original Instructions Manual page 17

OBJ_BUCH-828-005.book Page 17 Friday, February 5, 2016 1:33 PM
Checking the angular accuracy
For this check, you need a free surface of approx.
10 x 5 m on a stable and even base.
Should the measuring tool exceed the maximum deviation
during one of the tests, please have it repaired by a Bosch
after-sales service.
Checking the angular accuracy between the 0° and
the 90° laser lines
– Position the measuring tool in one of the corners of the
measuring surface. Switch on the measuring tool and
align it so that the 0° laser line runs along the long side
of the measuring surface and that the 90° laser line
runs along the short side of the measuring surface.
10 m
– Mark the crossing point of the laser lines on the floor
(Point I). Mark also the centre of the 0° laser line at a
distance of 5 m (Point II) and at a distance of 10 m
(Point III).
– 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 centre of the 90° laser line at a distance of
5 m (Point IV).
Bosch Power Tools
– Turn the measuring tool by 90° 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 centre of the 90° laser line at a distance of
5 m as point V as near as possible next to the point I.
– The difference d of the two points V and I is the actual
deviation of the 0° laser line and the 90° laser line from
the right angle.
The measuring length 2 x 5 m = 10 m has a maximum ad-
missible deviation of: 10 m x ±0.2 mm/m = ± 2 mm.
Therefore, the maximum difference d between the points
I and V may be 2 mm or less.
Checking the angular accuracy between the 0° and
the 45° laser lines
– Position the measuring tool in one of the corners of the
measuring surface. Switch on the measuring tool and
align it so that the 0° laser line runs along the long side
of the measuring surface and that the 90° laser line
runs along the short side of the measuring surface.
10 m
– Mark the crossing point of the laser lines on the floor
(Point I). Mark also the centre of the 0° laser line at a
distance of 5 m (Point II) and at a distance of 10 m
(Point III).
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