Cold Milling Machines: Width, Depth, Drum, Dust

Start with your task

Size width, depth and powerOutput and fit. Control silica dustWater and ventilation.

Size milling width, depth, drum and power

Asian Construction Equipment (ACE) lists its XBJ asphalt milling machines for removing and renovating asphalt surface layers on highways, urban roads, airports and yards. Models run from the XBJ50 (500 mm width, 180 mm depth, 54 tools, 660 mm drum, 93 kW, 7,800 kg, 0–40 m/min operating speed, 80 m³/h theoretical output) through the XBJ100 (1,000 mm, 180 mm, 82 tools, 162 kW, 15,600 kg) to the XBJ200 (2,000 mm, 320 mm, 162 tools, 980 mm drum, 390 kW, 34,000 kg, 0–40 m/min, 330 m³/h), with hydraulically driven drums and belt conveyors up to about 8 m long. [2]

Editorial calculation: removal volume is width × depth × forward speed; a 1.0 m wide machine milling 50 mm deep at 10 m/min removes 0.5 m³/min, about 30 m³/h, so a listed theoretical output is reached only at particular depth and speed combinations. Ask the supplier at what depth, speed and material its output figure applies. [2]

Editorial note: give the supplier the pavement type (asphalt or concrete), typical and maximum depths, widths and job lengths, and whether milled material is loaded to trucks or left in place.

Give the supplier the pavement (asphalt, concrete), widths and depths, daily area, truck loading needs, levelling control (grade and slope sensors), transport width and weight limits, engine emission requirement, water capacity and dust controls, drum and tool options, and service and wear-parts support.

Expect cutting force on each tooth to rise with milling depth

A 2024 laboratory study at Petroleum-Gas University of Ploiești milled compacted asphalt concrete blocks (350 × 240 × 100 mm, aggregate 4–16 mm, 6% bitumen) with a single Wirtgen-type steel cutter tooth with a tungsten carbide tip, at 15, 30 and 50 mm depth, 30, 75 and 300 rpm and advance speeds from 30 to 375 mm/min, measuring horizontal force with a 50 kN transducer and comparing it with Discrete Element Method (DEM) modelling. [4]

In the authors' ANOVA, milling depth accounted for 73.63% of the variation in horizontal force and advance speed for 7.50%, and the regression with both terms explained 81.1% (R² = 0.811). The authors identify 15 mm depth and 190 mm/min as the combination giving the lowest force on the tooth and link lower force to lower abrasive wear and longer tool life. [4]

The authors state that cutting speeds on their stand are lower than on road machines, so the forces apply to a single tooth in laboratory conditions and are not machine ratings. Editorial calculation: at 190 mm/min, going from 15 mm to 50 mm depth raised measured force from 605 N to 1,452 N, a factor of about 2.4. Ask the supplier for tool type, tool spacing on the drum, drum speed options and expected tool consumption per 1,000 m² at your depth. [4] [2]

Milling depth (mm)	Advance speed (mm/min)	Measured horizontal force at 75 rpm (N)
15	190	605 [4]
15	375	616 [4]
30	190	791 [4]
30	375	1,724 [4]
50	190	1,452 [4]
50	235	2,706 [4]

Control silica dust by machine size

OSHA's construction silica standard (29 CFR 1926.1153) Table 1 lists controls for milling machines. Small drivable milling machines (less than half-lane) must have supplemental water sprays designed to suppress dust, with water combined with a surfactant. Large drivable milling machines (half-lane and larger) must, for cuts of any depth on asphalt, have exhaust ventilation on the drum enclosure and supplemental water sprays; for cuts of 4 in or less on any substrate, either that arrangement or water sprays with surfactant. Walk-behind milling machines and floor grinders need integrated water delivery to the cutting surface or a manufacturer-recommended dust collector. No respirator is required for these drivable machines when the controls are used. [1]

Editorial calculation: 4 in is about 102 mm; ACE's maximum milling depths of 180–320 mm exceed it, and Table 1's large-machine options cover asphalt at any depth or any substrate at 4 in or less, so deeper cuts on concrete are not covered by a Table 1 option and need their own exposure assessment. Ask the supplier whether drum-enclosure exhaust ventilation and water sprays are fitted. [1] [2]

Write the highway agency's equipment and finish requirements into the order

Indiana DOT's revised Standard Specification Section 306, Milling (306-R-613, 2013), requires a power-operated cold-milling machine with automatic control devices that set profile grades by referencing the existing pavement or independent grade control, a positive means of controlling cross slope, an effective means of removing excess material, prevention of airborne dust escaping, and a finished surface that bonds well to the new overlay. [3]

The section defines the 16 ft straightedge as a rigid beam on two wheels 16 ft apart with adjustable tolerance points at the quarter points, and the 10 ft version with wheels 10 ft apart (a handheld rigid beam may substitute), and requires milling operations to be described in the contractor's quality control plan. These finish requirements sit alongside the machine sizes and silica-dust controls above. [3] [2] [1]

Editorial calculation: 5/8 in. ≈ 15.9 mm and 5/16–3/8 in. ≈ 7.9–9.5 mm tooth spacing; 1/4 in. ≈ 6.4 mm and 1/8 in. ≈ 3.2 mm tolerances.

INDOT 306 requirement	Value
Cuttings	90% of particles passing a 2 in. sieve
Coarse milling drum tooth spacing	5/8 in.; macrotexture ratio ≥ 1.8 (ITM 812)
Fine milling drum tooth spacing	5/16 or 3/8 in.; macrotexture ratio ≥ 5.0 (ITM 812)
Surface tolerance	1/4 in. from a 16 ft straightedge (or per QCP)
Cross-slope tolerance	1/8 in. under a 10 ft straightedge
Longitudinal vertical face in partial-day closure	Over 2 in. must be milled, resurfaced or tapered at 45° the same day
Transverse vertical faces exposed to traffic	Over 1 in. must be transitioned

State the agency specification the work is let under, drum type (coarse or fine), grade-control reference and dust controls, and ask the supplier for drum tooth spacing, grade and slope control system and dust suppression on the machine offered.

Compare what suppliers offer

Suppliers linked to this page list cold milling machines; each card links to the page reviewed.

The suppliers reviewed list asphalt milling machines with pavers and rollers; ask each for widths and depths, drum and tool data, engine and emission certification, levelling controls, water and dust systems, conveyor dimensions and wear-parts supply.

Trace the machine systems

This is a functional reference built from the sources cited; it is not one maker's design.

System	Role	Fix in the order
Milling drum and tools	Cut the pavement. [2]	Width; tools; diameter.
Engine and hydraulics	Power the drum. [2]	kW; drive.
Loading conveyor	Load trucks. [2]	Length; width.
Water sprays	Suppress dust. [1]	Capacity; surfactant.
Drum enclosure ventilation	Capture dust. [1]	Fitted.
Tracks or wheels	Travel and steer. [2]	Speed; turning.

Fill the specification fields with values for your work

A cold milling machine quotation needs values for your work. The table explains each field, gives published values where a reviewed source states them, and says what to obtain from the supplier.

Field	What it means and published values	Ask the supplier for
Milling Width (mm)	E.g. 500–2,000 mm. [2]	Drum options.
Milling Depth (mm)	E.g. 180–320 mm max. [2]	Max; control.
Engine Power (kW)	E.g. 93–390 kW. [2]	Power; emissions.
Operating Weight (kg)	E.g. 7,800–34,000 kg. [2]	Transport weight.
Travel Speed (km/h)	E.g. 0–5 to 0–8 km/h. [2]	Working and travel.
Milling Drum Diameter (mm)	E.g. 660–980 mm. [2]	Diameter.
Number of Cutting Tools	E.g. 54–162. [2]	Tool type.
Hydraulic System Pressure (MPa)	Drum drive. [2]	Pressure.
Water Consumption (L/min)	Dust sprays. [1]	Tank; flow.
Gradeability (%)	Site slopes.	Value.
Noise Level (dB(A))	Operator exposure.	Measured.
Fuel Tank Capacity (L)	Shift length.	Capacity.
Drum tooth spacing and finish	Coarse 5/8 in., fine 5/16–3/8 in.; 1/8 in. cross-slope in 10 ft (INDOT 306). [3]	Drum options; grade/slope control.

Send the pavement, depth and dust-control data together

Paste it into your enquiry below or into an email to a maker, then replace every bracket.

Pavement: [asphalt; concrete]
Cuts: [width; depth; area per day]
Loading: [conveyor; trucks]
Levelling: [grade; slope sensors]
Dust: [water sprays; surfactant; drum ventilation]
Transport: [width; weight]
Support: [tools; wear parts; service]

See manufacturer records Send an enquiry through CNFX

Buyer questions

How wide and deep can cold milling machines cut?

ACE lists XBJ machines from 500 mm to 2,000 mm wide, milling up to 180–320 mm deep. [2]

What dust controls do milling machines need?

OSHA Table 1 calls for water sprays with surfactant on small drivable machines and drum-enclosure ventilation plus water sprays on half-lane and larger machines. [1]

Do milling machine operators need respirators?

OSHA Table 1 requires none for drivable milling machines when the listed controls are used. [1]

What finish tolerance do highway agencies set for milling?

Indiana DOT Section 306 sets 1/4 in. from a 16 ft straightedge and 1/8 in. cross-slope under a 10 ft straightedge, with coarse (5/8 in.) or fine (5/16–3/8 in.) drum tooth spacing. [3]

What raises the load on milling drum cutting tools?

In a 2024 single-tooth laboratory study, milling depth accounted for 73.63% of the variation in horizontal cutting force and advance speed for 7.50%; measured force at 190 mm/min rose from 605 N at 15 mm depth to 1,452 N at 50 mm. [4]

Sources and what still needs a direct check

Sources checked 2026-10-12. OSHA's silica standard is a US federal rule; Indiana DOT's Section 306 is a state highway specification; the Petroleum-Gas University of Ploiești study reports laboratory cutting forces on a single milling tooth; ACE describes its own machines.

Still to check yourself

Fix widths and depths.
Check output at your depth.
Specify dust controls by size.
Plan truck loading.
Verify the legal supplier and factory.

Cold milling machine (asphalt milling machine, cold planer)