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13-6 Edition 47
Cold Planers
Low Density Asphalt
Depth
PM620, PM622
mm
in
m/min
ft/min
51
2
40
130
101
4
32
105
127
5
21
70
178
7
12
40
254
10
6
20
305
12
5
15
High Density Asphalt
Depth
PM620, PM622
mm
in
m/min
ft/min
51
2
32
105
101
4
26
85
127
5
18
60
178
7
9
30
254
10
5
15
305
12
4
12
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.
Cold Planing Fundamentals