90
2.
Level the floor plate by adjusting the two thumbscrews.
Be particularly careful as any out-of-level condition can influence
the target centerline.
3.
Record the target reading, paying close attention to the plus
(+) or minus (-) signs.
4.
Rotate the entire floor plate 180°.
Be sure that the target face is rotated to receive the laser beam and
is square to the incoming beam.
5.
Carefully re-level the floor plate and record the reading.
If you add the two numbers together and then divide by two you
will get the target error (the amount that the target center is off
from the axis of rotation.).
Example
First reading -.063
Second reading +.075
Added together +.012
Divided by two +.006
The target center is +.006 in. off center of the axis of rotation. It is not possible to manually adjust the
target center, so you must adjust the laser to this offset and then zero the target.
In this case, adjust the laser (using the azimuth adjustments) until the readout reads +.006 in.
Note:
In the above example, if the current reading is +.075, adjust the laser until the reading is
+.
006
in.
If you rotate the floor monument back to its first reading position, the reading should still be +.006 in.
If the laser center is exactly over the center of the axis of rotation, you will see the same number and
same sign when rotating the floor monument.
6.
Zero the target and repeat this procedure with the second target.
Place the two targets in the desired locations and be sure that they are both facing the same direction.
If they are placed facing opposite directions, you can have some serious errors when repositioning the
laser for centerline offsets.
Figure 42 –
Three Centers Coincident
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