Bosch GTL3 Instrucciones De Funcionamiento página 11

GTL3 manual-3 2610A11667:Bosch 2/23/11 12:50 PM Page 11
Influences on Accuracy
The ambient temperature has the greatest
influence. Especially temperature differences
occurring from the ground upward can divert
the laser beam.
Therefore, position the tool as near as
possible to the work surface and fix it with
the underside as parallel as possible to the
work surface.
Apart from exterior influences,
device-specific influences (such as heavy
impact or dropping) can lead to deviations.
Therefore, check the accuracy of the tool
each time before starting your work.
Checking the angular accuracy
For this check, you need a free surface of
approx. 10 x 16 ft on a stable and even base.
Should the 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 tool in one of the corners of
the measuring surface. Switch on the 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.
– Mark the crossing point of the laser lines
on the floor (Point I). Mark also the center
of the 0° laser line at a distance of 16 ft
(Point II) and at a distance of
33 ft (Point III).
– Position the tool (without turning it) at a
Angular Accuracy
33 ft
distance of 16 ft 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 center of the
90° laser line at a distance of 16 ft
(Point IV).
– Turn the tool by 90° so that the center 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 center of the 90° laser line at a
distance of 16 ft 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 16 ft = 32 ft has a
maximum admissible deviation of:
32 ft x ±0.00787 in/ft = ± 0.25 in.
Therefore, the maximum difference d
between the points I and V may be 0.25 in
or less.
Checking the angular accuracy between
the 0° and the 45° laser lines
– Position the tool in one of the corners of
the measuring surface. Switch on the 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.
– Mark the crossing point of the laser lines
on the floor (Point I). Mark also the center
of the 0° laser line at a distance of 16 ft
(Point II) and at a distance of 33 ft
(Point III).
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33 ft