But that doesn't mean there's nothing to learn. Too much use; Power Problems; Bad brushes; Bad Motor Our tests confirmed that under heavy load -- such as that experienced when one bears down on the sander -- components like discs and hook-and-loop fasteners become prone to overheating and early failure. The suction sections are blocked; The filter is not attached properly; The filter is full; Hook-and-Loop System Detached. This resistance increases with the coarseness of the sanding disc, the roughness of the wood, the sander's weight, and the pressure applied by the operator's hand. Maybe your resources can shine some light on this, or did manufacturers just give us variable speeds because we thought we should have it? This is a strangely shaped plastic/rubber/polymeric "ring" on the Makitas. © 2021 Meredith Corporation. We focused our efforts on the most common wipe- and brush-on consumer finishes, including polyurethanes and poly-acrylics, and to a lesser extent, lacquers and oil blends. If one of these wires get cut when the regulator is on full speed, then you won’t be able to control the speed … A correct pace is about 1-inch per second. Random orbital sander doesn’t have that usual rotating process like every other tool. The sander should be allowed to spin freely and under its own weight plus light hand pressure. This seems to spin much slower, but use more vibration to sand. My background is in aerospace manufacturing. The Orbit Sander turns on but does not spin or spin fast enough when being applied to the work surface. (We marked the sample number, 119, on the edge of the board for reference.). The regulator of the speed controller is connected to the transistor and the potentiometer using a few wires. Is the ETS not what I think a random orbital is? Is this normal? Most of us move the sander far too quickly — like we are polishing our shoes or something. Consequently, working with this tool is not so tiring like belt sanders or traditional pad. The pad is linked directly with the tool’s motor and therefore gets its full power. if you take that brake out, the sander will spin like an angle grinder. Knowing the RPMs and diameter of the wheel allowed us to figure inches per second of travel. I set my random-orbit sander to maximum speed for any grit I’m using and leave it there all the time. To test the effects of different linear sanding speeds on surface quality, one of our experiments utilized a stock feeder to move boards beneath a random orbit sander. An orbital sander will spin too fast if the regulator stops working. To find answers, we needed a means of controlling downward force. 3. sander I own makes some recommendations on speed settings to use for woods, metals or paintwork. So, at least according to this manufacturer, medium to full speed is suitable for pretty much every sanding task. Here’s the symptoms. Chris Marshall: Dennis, as you point out, I’ve seen no real difference either in cutting efficiency by varying the speed of my sander relative to the coarseness of grit I’m using. Rather than spout conventional wisdom, we challenged it in our shop and came up with several strategies you can use in yours. If you try and sand w/it in this condition it’ll scar whatever it touches. Scrollsaw, Carving, and Decorative Projects. We crosscut the cherry samples (bottom pair) from a single board and, likewise, sanded them to different levels. We visually evaluated the effects on the sanding surface and used instruments to gauge stress on the tool. I do alot of vertical stuff, doors, cabinets, etc. A random orbit sander just might be the most user-friendly power tool there is. In any case, they mean you aren't done sanding. When you start one, if you don’t apply pressure right away to the pad, it starts spinning…fast. ... a random orbital sander has a round sanding pad and makes an orbiting motion to the spin of the discs. Here, stain reveals the pattern left by an on-the-board sander start. Disc speed is one thing, but how fast should you move the sander itself for the best results? This issue arises when the oscillation bearing freezes up and can be solve by lubricating the engine bearings thoroughly. We worked with side (raked) lighting, which is invaluable for spotting sanding and finishing flaws. Beyond that, I’m not certain that variable speed control makes much difference at all to the final surface smoothness. The random orbit motion provides overlapping sanding movements while rotating slowly while sanding. A well-maintained sander, used with sound technique and fresh abrasives, leaves a path that is thoroughly and evenly scuffed, with scratches of uniform depth. It moves in only one way. Beginners treat all lumber as equal, but experts use each board to its best advantage. Look for an... read more. The random orbital sander, however, is a sanding machine that can oscillate in addition to spinning. We employed an infrared thermometer to measure the heat thrown off by sanders and sanding discs under varying conditions and loads. The rectangular bottom also makes it easy to reach into corners. Really can’t see much difference in the final surface. In metal machining, fewer cutter teeth equals lower rpm and more teeth will allow higher rpm. It is specially designed to oscillate in a random fashion giving a non-repeating motion and a swirl-free surface. Archived. Nickjb, thanks. I noticed the disc wasn't spinning really fast, maybe 200 RPM and I could actually stop it spinning with my hand or if I pushed too hard (but it would still be orbiting). Interestingly, a manual that came with a Bosch variable-speed R.O. Unlike orbit-sanders, which merely rotate in tiny circles, random orbital sanders not only rotate, but also add a slight wiggling spin to their motion, meaning that the rotations don’t have a definite pattern–hence are random–and the resulting sanding action is very fine and smooth.
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