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BM 2610A16273 07-13_BM 2610A16273 07-13 7/30/13 2:02 PM Page 20
– Position the laser tool on the other side of the door opening directly
behind point II. Allow the laser tool to level in and align the vertical laser
line in such a manner that its centre runs exactly through points I and II.
– The difference d between point III and the centre of the laser line at the
upper edge of the door opening results in the actual deviation of the laser
tool from the vertical plane.
– Measure the height of the door opening.
The maximum permitted deviation dmax is calculated as follows:
d
= double height of the door opening x 0.3mm/m
max
Example: With a door opening height of 2 metres, the maximum permitted
deviation is
d
= 2 x 2m x 0.3 mm/m = 1.2 mm. Thus, the marks must not be more
max
than 1.2 mm apart.
For this check, a free measuring distance of approx. 5m between floor and
ceiling on a firm surface is required.
– Mount the laser tool onto the rotating platform and place it on the floor.
– Switch the laser tool on and allow it to level.
– Mark the centre of the upper crossing point on the ceiling (point I). Also
mark the centre of the bottom laser point on the floor (point II).
Checking plumb accuracy
-20-
5 m
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