Bosch GLL3-300G - Checking Vertical Leveling Accuracy

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– The difference d of both marked points I
and III on wall A results in the actual height
deviation of the tool alongside the lateral axis.
On the measuring distance of 2 x 16 ft = 32
ft, the maximum allowable deviation is:
32 ft x ±0.003 in/ft = ±3/32 (0.096 in)
Thus, the difference d between points I and
III must not exceed 3/32 in (max.).
Checking the Leveling Accuracy
of the Vertical Line
For this check, a door opening is required with
at least 8 ft of space (on a firm surface) to
each side of the door.
– Position the tool on a firm, level surface
(not on a tripod) 8 ft away from the door
opening. Allow the tool to level in while in
vertical operation with automatic leveling,
and direct the laser beam at the door
opening.
8ft (2.5m)
8ft (2.5m)
– Mark the center of the vertical laser line at
the floor of the door opening (point I), at a
distance of 8 ft beyond the other side of the
door opening (point II) and at the upper
edge of the door opening (point III).
6.5ft (2 m)
d
– Rotate the tool by 180° and position it on
the other side of the door opening directly
behind point II. Allow the tool to level in and
align the vertical laser line in such a manner
that its center runs exactly through points I
and II.
– Mark the center of the laser line at the
upper edge of the door opening as point IV.
– The difference d of both marked points III
and IV results in the actual deviation of the
tool to the plumb line.
– Measure the height of the door opening.
The maximum admissible deviation is
calculated as follows:
Repeat the measuring procedure for the
second vertical laser plane. For this, select
an operating mode in which a vertical laser
plane is generated aside of the tool. Turn the
tool 90° before beginning with the measuring
procedure.
Calculate the maximum deviation as follows:
Doubled height of the door opening x 0.003
in/ft
Example: For a door-opening height of 6.5 ft,
the maximum deviation may be
2 x 6.5 ft x ±0.003 in/ft = ±1/32 (0.03125 in)
Consequently, points III and IV may be
no more than 1/32 in (max.) apart from
each other.
2610056508 GLL3-300 03-20.indd 13 3/5/20 8:14 AM