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Stringline Setup
Setting Projected Slope Stringline
90
P-32+ and P-32 Operator’s Manual P/ N: 1001547-01
3. At each station, staple or Ty-wrap the stringline directly to the witness lath at the desired “hike-up”
(Figure 164).
Figure 164: Stringline Attached to Lath
4. Due to the height of some stakes, raise the Tracker or cut off the tops of the stakes.
Setting Projected Slope Stringline
Jobs with slope transitions or super-elevations have the stringline set to the “projected slope.” As the profiler
cuts, the Sonic Tracker and mill follow the slope of the job, preventing elevation errors at the edge of the road
as the slope changes.
To set the stringline to the projected slope,
1. Set up the string at the desired elevation as shown in “Setting Elevated Stringline” on page 86.
2. Raise or lower the stringline to compensate for the percentage of slope and the distance from the edge of
the road to the stringline:
Rise = Run X Slope Percentage
If the road rises away from the stringline, lower the stringline (Figure 165).
Figure 165: Lower Stringline: 2% Cross Slope w ith 2 Foot Offset
2
V
2
V
2
V
Hub
2.0' Offset
2.0'
2.0%
Projected Slope
2.0% Slope X 2.00' Offset = .04'
Lower
.04'
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