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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.
– 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).
2610056508 GLL3-300 03-20.indd 13
– 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.
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3/5/20 8:14 AM
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