1. Milling & Micro Milling
11/5/ :22 PM
Milling & Micro Milling
Mike Bussard General Superintendent,
P.R. Systems, inc.
© 2007 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

2. The Heart Of Cold Milling Machines
11/5/ :22 PM
The Heart Of Cold Milling Machines
A cold milling machine's most important tool is the milling drum.
Rotating point-attack cutting bits are inserted in toolholders that are fastened onto the drum body.
The texture of the milled surface is determined by the bit spacing, which is the distance between one cutting bit to the next.
© 2007 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

3. The Milling Drum: Micro Drum Standard Drum
11/5/ :22 PM
The Milling Drum:
Standard Drum
Standard milling drums with a tool spacing of 5/8”.
Ideally suited for the removal of individual layers or complete pavement structures.
This drum is used 99% of the time
Micro Drum
Micro fine milling drums with tool spacing's of up to 1/4”.
Ideally suited to remove a very thin layer of the surface to restore the pavement`s evenness for thin lift overlays.
Skid Resistance
© 2007 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

4. Surface Comparison
Standard Milled Surface
Micro Milled Surface

5. Standard Drum Pattern 5/8” Bit spacing
Can be used for complete removal up to 14”
Most common practice in todays mill & fill

6. Traditional Mill Process

7. What is Micro Milling?
Roughly 3 times the cutting bits of a standard drum
Best if used from 0”-2” milling depths
Used when surface texture matters the most

8. Micro Mill Process

9. Ridge To Valley Depth (RVD)
Traditional Drum RVD 5/16” or 8mm deep
Micro Drum RVD 3/32”- 1/8” or 3 – 4mm deep

10. Micro Milling Results Up Close Micro Milled Surface
RAP From Micro Milling

11. Micro Mill Advantages
Shallow grooves and small vertical edges allows you to open to traffic
Can grind entire job complete before paving
Creates a smaller RAP size
Bump Repairs
Research shows better adhesion for asphalt
When applied correctly micro milling can put IRI values in bonus $$$ Range

12. Determining Factors For Surface Texture/Surface Pattern
Bit Spacing (From 1/4” to 5/8”)
Wrap Configuration
Forward Speed
RPM
Diameter of Drum, (Typically set by manufacturer)
Drum Maintenance (Very Important)

13. Cutter Drum Maintenance
Keep from hitting structures!!
Do not use to remove boulders (3” or Larger)
Don’t Replace used holders with new holders

14. Maintaining Cutter Drums
New Toolholder vs Used Toolholder

15. Micro Mill With Multi Plex Sensing
Multiplex systems are used to measure sustained, stretched-out unevenness and combine multiple sensors on one or both machine sides (e. g. cable, ultrasonic, cylinder sensor). Using the average value of the connected sensors, the current milling depth is calculated with high precision. Longitudinal waves can thus be highly compensated for. The system is especially suited towards fine milling work.
With the Multiplex levelling system, sensor signals are calculated to arrive at an average differential value. This enables unevenness to be smoothed out considerably.

16. Questions?