Jeff Ensell: Milling for pavement smoothness
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Milling For Smoothness
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Transcript of Jeff Ensell: Milling for pavement smoothness
Milling For Smoothness
You need a control point
Continuous MillingThere 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.
Cut DepthMost Machines today cut from at least 0-14” .
ScabbingMachines cannot control scabbing. You should go deeper or come up to get to stable material.
Sometimes speed does not help this situation.
RX-900
AAMM
AUTO
2D Control Systems
AUTO
AAMM
AUTO
V
LL RR
MMAA
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
RX-900
AUTO
AAMM
AUTO
V
LL RR
MMAA
Averaging Systems
AAMM
AUTO
3D Control Systems
Mill to Grade based on Position
They are only as accurate as the Data.
Proper Holder Wear
anti-seize
Tool Wear Characteristics
At Stage 3Tool has lost 0.365 “ [9.3 mm] of
gage height
0.43 in20.15 in2
Look at the Holders
Caliper set at EXACTLY 2”
Tooth Pattern
Proper Maintenance
Proper Maintenance
Proper Maintenance
Production Tradeoff
Keep it Clean
Your Cut surface is only as good the surface you Walked on.
If you have this to work with you willnever achieve grade.
Why?
Clean up your messOur shovel is on the water truck.
The automatics will take that out…
Keep it Clean
The Math of Milling
Drum RPM
ForwardSpeed
Line Spacing
0Lacing Pattern
Diameter
The 4 Main Factors that Affect Surface Texture1. Line Spacing2. Forward Speed3. Drum RPM4. Lacing Pattern
Drum LacingsScroll Start Comparisons
Triple Wrap Double Hit Quad Wrap
Line Spacing and Texture
5/8” 5/8”
≈⅛”
5/8” (16mm) Triple Wrap Lacing Pattern
5/8” (16 mm) Triple Wrap at 30 fpm
2/10” (5mm) Triple Wrap Lacing Pattern
0.2”
≈1/16”
2/10” (5mm) Triple Wrap Lacing Pattern
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 teethNearly 5 times the cost
No more quick change holders
The Math of Milling
Drum RPM
ForwardSpeed
Line Spacing
0Lacing Pattern
Diameter
The 4 Main Factors that Affect Surface Texture1. Line Spacing2. Forward Speed3. Drum RPM4. Lacing Pattern
Sand Patch TestASTM E965
Indiana Glass Bead Test (ITM 812)
http://www.in.gov/indot/div/mt/itm/pubs/812_testing.pdf
Advance Rate = 30 fpmDrum Diameter = 46”Drum Speed = 100 rpm
Advance Rate = 30 fpm
MachineAdvance
3.6”
0.071”
30 fpm
Advance Rate = 60 fpm
MachineAdvance
7.2”
0.28”
Advance Rate = 60 fpmDrum Diameter = 46”Drum Speed = 100 rpm
60 fpm
Advance Rate = 120 fpm
MachineAdvance
14.4”
1.16”
Advance Rate = 120 fpmDrum Diameter = 46”Drum Speed = 100 rpm
120 fpm
30 fpm vs. 120 fpm
2.3 miles in a day vs. 9.1 miles in a day
The Math of Milling
Drum RPM
ForwardSpeed
Line Spacing
0Lacing Pattern
Diameter
The 4 Main Factors that Affect Surface Texture1. Line Spacing2. Forward Speed3. Drum RPM4. Lacing Pattern
The Math of Milling
Drum RPM
ForwardSpeed
Line Spacing
0Lacing Pattern
Diameter
The 4 Main Factors that Affect Surface Texture1. Line Spacing2. Forward Speed3. Drum RPM4. Lacing Pattern
Double Hit Drums
Above
Double hit Quad wrap drum
Standard triple wrap drumBelow
1
2
3
1
2
3
4
Single HitTriple Wrap
Pattern Comparisons
Double HitQuad Wrap
Pattern Comparison
7/8” DHQW at 100 FPM5/8” Triple Wrap at 100 FPM
Thank you & Slow Down
