Caterpillar Performance Handbook, January 2017, SEBD0351-47

Cold Planing Fundamentals

Cold Planers

Low Density Asphalt Depth

As long as the cold planer maintains a productive for- ward speed, deeper cuts will yield greater production and tend to lower tooth cost. Tooth wear does not increase in direct proportion to production when the machine is working in an efficient range. Tooth wear at various depths for a given material is affected by how long the tooth remains in the cut. Because the teeth are mounted on a circular drum, each tooth cuts through the pavement in an arc. The tooth arc at a 102 mm (4 in) cutting depth, however, is not four times longer than at a 25 mm (1 in) cutting depth, even though production may be four times greater. The cut- ting arc at 102 mm (4 in) is approximately twice as long as that at 25 mm (1 in). The peak cutting depth for a particular cold planer on a specific job is best determined by examining produc- tion, and subsequent costs, of a single deep cut versus multiple passes at a shallow depth.

PM620, PM622

mm

in

m/min

ft/min

51

40 32 21 12

2

130 105

101 127 178 254 305

4 5 7

70 40 20

6 5

10 12

15

High Density Asphalt Depth

PM620, PM622

mm

in

m/min

ft/min

51

32 26 18

2

105

101 127 178 254 305

4 5 7

85 60 30 15

9 5 4

10 12

12

13-6 Edition 47