Bosch GLL2-45 - Checking Vertical Line Accuracy; Use with Attachments

-12-
Working with the Positioning Device
(see figures I-P)
The positioning device 13 provides easy ability
to properly position the laser line or lines.
It attaches to job site surfaces as follows:
– To drywall or wood walls using No. 8
screws
– To sit on the floor using retractable feet
– To steel studs using the magnets on
the back
– To ceiling grid rails using the clip
functionality
It can also be used as a mini tripod.
• Toattachthelasertool,screwthe1/4”-20
mount into the tool and tighten. Turn the
knob and tool together as necessary to
properly position the laser line or lines.
• Toadjusttheheightofthelaserlines,
adjust the height using the adjustment
knob on the clip attachment.
Checking the Leveling Accuracy of the
Vertical Line
For this check, a door opening is required with
at least 13 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) 13 ft away from the door
opening. Allow the tool to level in while in
cross-line operation mode, and direct the
laser beams 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 26 ft beyond the other side
of the door opening (point II) and at the
upper edge of the door opening (point III).
– Position the tool 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.
– The difference d between point III and the
center of the laser line at the upper edge
of the door opening results in the actual
deviation of the tool from the
vertical plane.
– Measure the height of the door opening.
The maximum permitted deviation dmax is
calculated as follows:
dmax = double height of the door opening
x 0.0036 in/ft
Example: With a door opening height of 2
meters, the maximum permitted deviation is
dmax = 2 x 7 ft x 0.0036 in/ft = 0.05 in. Thus,
the marks must not be more than
0.05 in. apart.
13 ft
13 ft
7 ft
d
13 ft
13 ft
7 ft
d
Use with Attachments