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A detailed buying guide: how to choose a pneumatic random orbital sander.
This section covers pneumatic random orbital sanders with 125 and 150 mm pads for smooth sanding and preparation of car bodies, paint, filler, wood and composites. They are used in car body and paint shops, furniture production and renovation. Air models are light and compact, do not overheat during long work and are safe for wet sanding, but they need an electric or petrol compressor with sufficient output. For more on air tools, read what pneumatic tools are and how they work.
Random orbital sanders combine rotation and oscillation, so they sand without swirl marks, unlike simple orbital models. Gear-driven models are available for aggressive stock removal, while polishing calls for machines with suitable speed. See how to choose a polisher.
The most common sizes are 125 and 150 mm with hook-and-loop (Velcro) attachment, and the pad has 6–15 holes for dust extraction. Abrasive holes must line up with the pad holes, and grit is chosen by work stage. Read how to choose sandpaper and what is sandpaper grit.
An orbit of 2.5–3 mm gives a fine, clean finish before painting, while 5 mm or more gives fast, coarse sanding. Free speed is usually 10,000–12,000 RPM, and a speed regulator helps on sensitive surfaces. See what is rotational speed (RPM).
Random orbital sanders consume about 250–400 l/min and run for long periods, which makes them among the most demanding air tools. Choose a compressor whose real delivery exceeds this consumption by about 30–50 %. Read how to choose an air compressor and how to calculate compressor air delivery.
The rated pressure is 6.2–6.3 bar: if pressure drops, the pad slows down and sanding becomes uneven. Set the pressure with a regulator, measured near the tool. See how to choose compressor working pressure.
Models may have their own dust bag or a port for an external extractor, which keeps the surface clean and extends abrasive life. Wear a respirator when dry sanding. Read how to choose a respirator.
The tools have a 1/4" inlet for a EURO, ORION or RAPID coupler, and a hose with an 8–10 mm inner diameter is preferred. A filter and water separator are essential, and do not feed oil through the same line you use for painting. See how to prepare compressed air: condensate, filters, regulators, and lubricators.
A low-profile body and palm grip let you apply even pressure, and a balanced mechanism reduces vibration. An exhaust silencer lowers noise, but ear protection is needed for long work. Read how to choose hearing protection.
Start the sander only when it rests on the surface so the pad does not over-speed in the air, and disconnect the air when changing the pad or abrasive. Worn pads, vanes and bearings can be replaced. See how to use pneumatic tools safely and how to choose spare parts for pneumatic and hydraulic tools.
At ToolsArmenia you can compare pneumatic random orbital sanders by pad diameter, orbit, speed, air consumption and dust extraction and choose a model that suits your jobs and compressor.
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