Machines come in either three- or four-track versions
The Roadtec milling machine line includes the RX-500, RX-700 and RX-900. These models offer a horsepower range of 500 to 950 horsepower and half-lane to full-lane milling widths. Cut widths range from 2 feet to 13 feet 6 inches and the maximum cut depth is 14 inches. Roadtec offers these models in either three- or four-track versions, and features two spray bars in the cutter drum housing for better dust control and tool cooling.
Utility-class machine fits smaller milling jobs
Ingersoll Rand’s MW-500 is a four-wheel, rear-loading, utility-class milling machine with a standard cutting width of 20 inches. With its compact size and maneuverability, the machine is a fit for patching, trench and shoulder milling jobs. A 125-horsepower Deutz diesel engines powers the machine, and power is transferred via an automatically tensioned belt drive. An independently driven cooling fan is designed to ensure trouble-free operation at high ambient temperatures. The fan automatically switches on and off as required, for reduced noise and fuel consumption. The machine offers a 7-inch cutting radius, comparable to many three-wheel machines on the market. The right rear support leg and wheel can be swiveled inboard for flush cutting.
Central-mount drum allows precision milling
The centrally mounted drums on Bomag’s BM1000/30 and BM1300 (pictured) cold planer milling machines allow precise milling next to walls, curbs and other obstructions. This design eliminates the need to move the right track away from the cut line, which gives the machines improved overall balance and makes it possible to use a much shorter take-off belt. Suited for utility and general surface milling, along with shoulder repairs, both machines are powered by a 275-horsepower Caterpillar diesel engine. The BM1000/30 has a standard cutting width of 39.6 inches, while a 51.4-inch cutting width is standard on the BM1300/30. The direct mechanical drive design of the cutting drum provides maximum power transfer – both units can mill depths up to 12.6 inches.
Limit maximum working speed with three-speed selector switch
Caterpillar’s PM-200 half-lane milling machine has dual operator stations, a front folding conveyor with hydraulic control, load control, two propel speeds with three electronic speed selections and four modes of steering. Powered by a 575-gross-horsepower Cat C18 engine, the machine is fully hydrostatically driven by a variable displacement propel pump supplying oil to dual displacement motors on each track. When load control is engaged while the machine is working, it’s possible to electronically limit the maximum working speed via a three-speed selector switch. A positive traction control valve provides equal traction to all four motors, thus increasing tractive effort in tough cutting applications.
Half-lane paver debuts next quarter
Terex will start production of its Terex CMI PR950 cold planer in the first quarter of 2007, one of several new milling machine introductions scheduled for the first half of next year. With its standard six-cylinder, 950-horsepower Cummins diesel engine, the mainline PR950 can generate cuts up to 15 inches deep with its half-lane cutting width of 86 inches at working speeds reaching 168 feet per minute. The three-track model has a weight of 76,000 pounds. The machine’s tapered cutter housing design carries less material, greatly reducing clean-up requirements. Forty-two-inch wide upper and lower conveyors quickly channel material away from the cutter. The upper conveyor swings 60 degrees either to the left or right of center, allowing material to be discharged directly into a truck on either side of the machine.
Fine textured drums support thin lifts
By using a fine-toothed milling drum at a moderate speed of 50 to 60 feet per minute, contractors can optimize smoothness with a full- or half-lane Wirtgen cold mill machines. While a convention drum at slower-than-usual speeds will provide much the same result, Wirtgen says, most milling contractors won’t go as slow as 25 to 30 feet per minute. The company’s Flexible Cutter System Light for its W1900 and W2000 enables quick change of a conventional to fine-textured drum in a matter of hours.
Milling attachments
Tooth locator system reduces drag in the cut Zanetis Power Attachments has introduced the second generation of its skid-steer planer. The planer now has a driveline consisting of a planetary torque hub, driven by a piston motor and rated for systems with output as high as 42 gallons per minute at 5,000 psi. The driveline is submerged within the chassis, eliminating the possibility of damage and increasing side clearance. The height of the drum housing has been reduced by 5 inches, and the length of the planer is 7 inches less than the first generation attachment, increasing visibility and downforce to the cutting drum. The cutting drum features a tooth locator system that simplifies tooth and holder replacement and allows 5 inches of the clearance between the tip of the cutting tool and the surface of the drum, thus reducing drag in the cut.
Turn your grader into a milling machine
Maddock Industries has new options for its RotoGrader, a self-powered rotary cutter drum attachment for motor graders. You can now select from a variety of cutter head widths ranging from 24 to 72 inches, and from several cutter bit configurations. The unit’s cutter drum attaches to the moldboard of a motor grader, and works well for milling butt joints, high joints and rough or rutted pavement. The attachment comes with a range of engine choices, including horsepower ratings of 125 to 115 horsepower. All operator controls mount in the motor grader cab.
Front of planer stays close to the pavement at all times
Coneqtec/Universal’s AP series planer skid-steer attachment offers front-down design, center-pivot construction, a patented open drum, direct drive system and optional hydraulic or electric controls. The front-down design keeps the front of the planer close to the pavement at all times. The depth adjustment is made by hydraulic cylinders at the rear of the planer, containing all material within the confines of the planer. The center pivot allows the weight transfer from the skid steer to be placed directly on the center of the drum, practically eliminating bouncing. The open drum slices through already milled asphalt and does not throw it out front or carry it over the top to be constantly remilled.
