jeff ensell: milling for pavement smoothness
TRANSCRIPT
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Milling For Smoothness
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You need a control point
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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.
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Cut DepthMost Machines today cut from at least 0-14” .
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ScabbingMachines cannot control scabbing. You should go deeper or come up to get to stable material.
Sometimes speed does not help this situation.
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RX-900
AAMM
AUTO
2D Control Systems
AUTO
AAMM
AUTO
V
LL RR
MMAA
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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
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RX-900
AUTO
AAMM
AUTO
V
LL RR
MMAA
Averaging Systems
AAMM
AUTO
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3D Control Systems
Mill to Grade based on Position
They are only as accurate as the Data.
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Proper Holder Wear
anti-seize
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Tool Wear Characteristics
At Stage 3Tool has lost 0.365 “ [9.3 mm] of
gage height
0.43 in20.15 in2
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Look at the Holders
Caliper set at EXACTLY 2”
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Tooth Pattern
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Proper Maintenance
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Proper Maintenance
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Proper Maintenance
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Production Tradeoff
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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?
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Clean up your messOur shovel is on the water truck.
The automatics will take that out…
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Keep it Clean
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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
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Drum LacingsScroll Start Comparisons
Triple Wrap Double Hit Quad Wrap
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Line Spacing and Texture
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5/8” 5/8”
≈⅛”
5/8” (16mm) Triple Wrap Lacing Pattern
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5/8” (16 mm) Triple Wrap at 30 fpm
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2/10” (5mm) Triple Wrap Lacing Pattern
0.2”
≈1/16”
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2/10” (5mm) Triple Wrap Lacing Pattern
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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
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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
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Sand Patch TestASTM E965
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Indiana Glass Bead Test (ITM 812)
http://www.in.gov/indot/div/mt/itm/pubs/812_testing.pdf
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Advance Rate = 30 fpmDrum Diameter = 46”Drum Speed = 100 rpm
Advance Rate = 30 fpm
MachineAdvance
3.6”
0.071”
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30 fpm
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Advance Rate = 60 fpm
MachineAdvance
7.2”
0.28”
Advance Rate = 60 fpmDrum Diameter = 46”Drum Speed = 100 rpm
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60 fpm
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Advance Rate = 120 fpm
MachineAdvance
14.4”
1.16”
Advance Rate = 120 fpmDrum Diameter = 46”Drum Speed = 100 rpm
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120 fpm
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30 fpm vs. 120 fpm
2.3 miles in a day vs. 9.1 miles in a day
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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
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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
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Double Hit Drums
Above
Double hit Quad wrap drum
Standard triple wrap drumBelow
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1
2
3
1
2
3
4
Single HitTriple Wrap
Pattern Comparisons
Double HitQuad Wrap
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Pattern Comparison
7/8” DHQW at 100 FPM5/8” Triple Wrap at 100 FPM
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Thank you & Slow Down