- The forward speed
- The angle of attack
- The head of material
- The material temperature
Pavers use the self-adjusting principle in order to achieve a smooth surface. The screed fills in low spots and the screed levels high spots in order to level out rough roads. The float of the screed is independent of the machine. The tow point is also called the pivot point. The machine tows the screed and the machine feeds material to the screed.
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| Illustration 1 | g00683327 |
There are two leveling arms. There is one leveling arm (2) on each side of the machine. The leveling arms tow the screed behind the machine. The leveling arms are attached to the machine at tow point (1). The screed is attached to the rear ends of leveling arms (3). The screed pivots around the tow point. The tow point is also called the pivot point. The screed operator can change the angle of attack by raising and lowering the tow point, or by turning the thickness controls.