11
Setting a Grade
Following is a method of setting a grade using the slope grade buttons as
previously discussed. Here we will run through setting a single grade on the
X axis, for a dual grade simple repeat the process on the Y axis.
Set up the laser aligning the X axis with the direction of the required grade
rise/fall, the laser can be placed anywhere on site as long as the X axis runs
parallel with the desired grade.
For this example we want a grade of 1 in 60 or 1.667% or in other words for
every 6m (6000mm) travelled away from the laser along the X axis we want
the laser plain to tilt down/up 0.1m (100mm).
To achieve this measure out 6m away from the laser along the X axis and
hold the staff at this point slide the receiver up/down the staff until the
receiver indicates level (see receiver instructions page 12).
Then making a note of the height on the staff slide the receiver up/down the
staff 100mm, this is now the height the laser needs to be hitting to be setting
a 1 in 60 slope or grade.
Using the remote, select grade mode on the X axis and use the Slope Grade
Direction buttons to slope the laser until the receiver shows level.
The Grade is now set at 1 in 60 or 1.667% on the X axis and anywhere
parallel to the X axis on site.
Chart below gives a range of grades and the distance the receiver shifts all
based a 5m distance of staff away from laser.
GRADIENT
%
DISTANCE LASER (M)
MOVE RECEIVER (MM)
1 IN 20
5
5
250
1 IN 30
3.3
5
167
1 IN 40
2.5
5
125
1 IN 60
1.66
5
83
1 IN 80
1.25
5
63
1 IN 100
1
5
50
Summary of Contents for CXR880
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