Views:32 Author:Site Editor Publish Time: 2017-01-13 Origin:Site
How They Work
Scarifiers, also called surface planers or milling machines, remove concrete faster and more aggressively than grinders.That's because they use the pummeling action of multitipped cutting wheels, or flails,that rotate at high speeds tochip away at the concrete surface
You can choose from manydifferent styles of interchangeable cutter assemblies toachieve the profile you need for each job.
Equipment choices range from small handheld units with 2 to 3inch cutting widths to manual push orselfpropelled walkbehind machines with working width of 8"to11" inches.
Production rates forwalkbehind models rangefrom 20to 60Sqm per hour, depending on machine size and horsepower, material\ to beremoved,hardness of the concrete and type of cutter used.
Cutting depths are adjustable on most machines,with somemodels achieving up to 1/4 inch of materialremoval in one pass.
More sophisticated models have selfleveling scarifying heads that automatically adjust to contours in the floor.
As with grinders, scarifiers are available with a choice of poweroptions (including gas, electric, and diesel) andwith hookups for attaching a vacuum to collect dust and debris.
The cutting wheels themselves are mounted on shafts on a removable drum. The number of cutter shafts per drum variesby model, but generally machines with more shafts can hold more cutters per loading for increased scarifying action and faster production rates. Look for machines with quickchange drum designs that allow you to switch or replace cutters in minutes.
A variety of interchangeable cutting wheels and drum setups allow scarifiers to perform a broad range of profiling tasks. Applications include removing coatings (even heavy floor tile mastics and rubbery elastomeric or epoxy materials)light or heavy milling, grooving walkways to make them slip resistant, removing trip hazards in sidewalks, and leveling misaligned concrete joints and uneven surfaces.
Most cutters are made of tungsten carbide or hardened steel and come in a myriad of styles to suit different applications. You can choose from different diameters and widths, number of cutting teeth, and tip styles (blunt or flat for aggressive removal, sharp for gentler scarifying action, or angled for scraping). Different grades of cutters are also available, with ultra-premium grades providing a much longer service life and more predictable finish. Manufacturers can recommend the cutter style and grade best suited for your needs.
Tips for Best Results
In addition to varying the cutter type, you can also achieve different finishes by adjusting the spacing and pattern of the cutter assemblies. The closer the cutters are spaced, the smoother the finish. A wide spacing achieves a coarse finish. Some contractors bring drums outfitted with different cutter types and arrangements to each job.
A scarifier generally leaves behind a rough finish and may create ridges in the concrete. On jobs where you need a smoother finish, you may need to grind the surface after scarifying.
Although both tungsten carbide and steel cutters can perform similar tasks, tungsten carbide cutters are more aggressive and longer lasting, making them practical for jobs requiring high production rates or scarifying of high-psi concrete. Steel cutters have a shorter life, but are also less expensive.
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