Topcon mmGPS 3D Paver, Reference Manual, Page: 166 / 288

Paving Principles
mmGPS 3D Paver Reference Manual
4-4
The same is true when making elevation changes with the manual
thickness cranks (Figure 4-5).
Figure 4-5. Manually Changing Mat Thickness
Always check mat depth in several locations before making any
elevation corrections. The surface being paved may have wheel ruts,
dips and ridges that give an untrue indication of overall mat depth.
Check several spots to get an average (Figure 4-6). If an elevation
change is made, wait 3 tow arm lengths for full correction. Too much
cranking and stabbing causes raising and lowering changes that
produces an uneven mat surface.
Figure 4-6. Checking Mat Thickness
Tow Point Path
Tow Point Path
1 Tow Arm Length Travel 2 Tow Arm Lengths Travel
3 Tow Arm Lengths Travel 4 Tow Arm Lengths Travel 5 Tow Arm Lengths Travel 6 Tow Arm Lengths Travel
63%
95% 98% 99% 100%
Change in Screed
Angle of Attack
from Crank
87%