Owners, agencies and motorists are demanding smoother pavements. Learn practical tips and best practices to achieve a smoother ride, and find out how technology is becoming a real “game changer.”

1. Milling For Smoothness

2. You need a control point

3. Continuous Milling
There are a lot of forces
generated during milling.
When you stop so do the
forces.
Plus all of the teeth now cut in
one spot, no longer spread
out.

4. Cut Depth
Most Machines today cut from at least 0-14” .

5. Scabbing
Machines cannot control scabbing. You should go deeper or come up
to get to stable material.
Sometimes speed does not help this situation.

6. 2D Control Systems
RX-900
A
M
AUTO
AUTO
A
M
AUTO
L R
V
M
A

7. What is controlled?
RX-900
Any Grade Sensor on the left, Any Grade Sensor on the right.
Any Grade Sensor on the left and Slope on the right
Any Grade Sensor on the right and Slope on the left

8. RX-900
AUTO
A
M
AUTO
L R
V
M
A
Averaging Systems
A
M
AUTO

9. 3D Control Systems
Mill to Grade based on Position
They are only as accurate as
the Data.

10. Proper Holder Wear
anti-seize

11. Tool Wear Characteristics
0.15 in2 0.43 in2
At Stage 3
Tool has lost 0.365 “ [9.3 mm] of
gage height

12. Look at the Holders
Caliper set at EXACTLY 2”

13. Tooth Pattern

14. Proper Maintenance

15. Proper Maintenance

16. Proper Maintenance

17. Production Tradeoff

18. Keep it Clean
Your Cut surface is only as good the
surface you Walked on.
If you have this to work with you will
never achieve grade.
Why?

19. Clean up your mess
Our shovel is on the water truck.
The automatics will take that out…

20. Keep it Clean

21. The Math of Milling
Drum RPM
Forward
Speed
Line Spacing
0
Lacing Pattern
Diameter
The 4 Main Factors that
Affect Surface Texture
1. Line Spacing
2. Forward Speed
3. Drum RPM
4. Lacing Pattern

22. Drum Lacings
Scroll Start Comparisons
Triple Wrap Double Hit
Quad Wrap

23. Line Spacing and Texture

24. 5/8” (16mm) Triple Wrap Lacing
5/8” 5/8”
≈⅛”
Pattern

25. 5/8” (16 mm) Triple Wrap at 30 fpm

26. 2/10” (5mm) Triple Wrap Lacing
Pattern
0.2”
≈1/16”

27. 2/10” (5mm) Triple Wrap Lacing
Pattern

28. Amount of Tools
12’6” (3.5 m) Full Lane Drum
Line Spacing # of Teeth Cost of Teeth
5/8” (16 mm) 268 $1340
3/8” (9 mm) 406 $2030
0.2” (5 mm) 770 $3850
Nearly 3 times more teeth
Nearly 5 times the cost
No more quick change holders

29. The Math of Milling
Drum RPM
Forward
Speed
Line Spacing
0
Lacing Pattern
Diameter
The 4 Main Factors that
Affect Surface Texture
1. Line Spacing
2. Forward Speed
3. Drum RPM
4. Lacing Pattern

30. Sand Patch Test
ASTM E965

31. Indiana Glass Bead Test (ITM
812)
http://www.in.gov/indot/div/mt/itm/pubs/812_testing.pdf

32. Advance Rate = 30 fpm
Advance Rate = 30 fpm
Drum Diameter = 46”
Drum Speed = 100 rpm
Machine
Advance
3.6”
0.071”

33. 30 fpm

34. Advance Rate = 60 fpm
Machine
Advance
7.2”
0.28”
Advance Rate = 60 fpm
Drum Diameter = 46”
Drum Speed = 100 rpm

35. 60 fpm

36. Advance Rate = 120 fpm
Machine
Advance
14.4”
1.16”
Advance Rate = 120 fpm
Drum Diameter = 46”
Drum Speed = 100 rpm

37. 120 fpm

38. 30 fpm vs. 120 fpm
2.3 miles in a day vs. 9.1 miles in a day

39. The Math of Milling
Drum RPM
Forward
Speed
Line Spacing
0
Lacing Pattern
Diameter
The 4 Main Factors that
Affect Surface Texture
1. Line Spacing
2. Forward Speed
3. Drum RPM
4. Lacing Pattern

40. The Math of Milling
Drum RPM
Forward
Speed
Line Spacing
0
Lacing Pattern
Diameter
The 4 Main Factors that
Affect Surface Texture
1. Line Spacing
2. Forward Speed
3. Drum RPM
4. Lacing Pattern

41. Double Hit Drums
Above
Double hit Quad wrap drum
Standard triple wrap drum
Below

42. Pattern Comparisons
1
2
3
1
2
3
4
Single Hit
Triple Wrap
Double Hit
Quad Wrap

43. Pattern Comparison
5/8” Triple Wrap at 100 FPM 7/8” DHQW at 100 FPM

44. Thank you & Slow Down