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To use an orbital sander, attach a hook-and-loop disc with its holes lined up, connect a vacuum, set the pad flat on the wood before you switch it on, and move it slowly in overlapping passes, about an inch per second, with no more pressure than your hand resting on it. Step up through the grits, clean the surface between each one, and switch off before lifting the sander.
That covers 90% of it. The other 10% is where swirl marks, gouged edges and burned-out pads come from, and it is what this guide is about. The steps below are written for a random orbital sander, the round-pad tool most people mean by “orbital sander”. If yours has a square pad, it is a sheet sander; I cover the differences at the end.
What You Need
- A random orbital sander, 5″ or 6″. If you don’t have one yet, start with my random orbital sander reviews.
- Hook-and-loop sanding discs in three or four grits, with a hole pattern that matches your pad (see my guide to the best sanding discs for random orbital sanders).
- A shop vac or dust extractor with a hose that fits the sander’s port. The onboard bag or canister catches far less. See the best shop vacs for dust collection.
- Safety glasses, hearing protection and a dust mask or respirator.
- Clamps or a non-slip mat to hold the workpiece.
How to Use an Orbital Sander, Step by Step
Step 1: Attach the Sanding Disc
Unplug the sander or remove the battery first. Knock the old disc off and brush any dust out of the hooks on the pad. Hold the new disc by its edges, line up its dust holes with the holes in the pad, then press it on from the center outward. The holes matter: if they don’t line up, the vacuum pulls through fewer openings and dust stays under the disc, where it clogs the paper and scratches the wood.
If your pad has 8 holes and the disc has 5, or you own sanders with different patterns, buy multi-hole or mesh discs, which work on any pattern. The disc should sit flat with no edge lifting. If it keeps flying off, the hooks on the pad are worn and the pad needs replacing, not the discs. Here’s how to find a replacement pad that fits your sander.
Step 2: Choose the Starting Grit
Start with the finest grit that removes the worst mark on the surface: 80 for old finish or rough boards, 120 for new lumber. Plan your sequence before you begin, for example 80, 120, 150, 180. My sandpaper grit chart lists the right start and finish grit for every job.
Step 3: Connect Dust Collection and Put On Your Protection
Connect the vacuum hose to the dust port. Beyond keeping the room clean, extraction makes the sander cut better, because dust trapped under the disc makes it skate and clog. Put on safety glasses, hearing protection and a dust mask. Fine wood dust is the part of sanding you don’t see and shouldn’t breathe.
Step 4: Secure the Workpiece
A random orbital sander pulls sideways as it spins. Clamp small parts to the bench, or put them on a non-slip router mat. Large panels and tabletops usually stay put under their own weight.
Step 5: Set the Speed
If your sander has a speed dial, use the top setting for stock removal on bare wood, and turn it down for finish sanding, for veneer, for sanding between coats and for anything that heats up and gums the paper, like old paint or resinous pine. The Makita BO5041, for example, goes down to 4,000 OPM; the Bosch ROS20VSC and DEWALT DWE6423K start at 7,500 and 8,000.
Step 6: Start the Sander on the Wood
Place the pad flat on the surface, then switch on. Starting it in the air and bringing it down spinning is the quickest way to gouge the wood, because the disc hits the surface at full speed and at an angle. The same applies at the end: switch off with the pad on the wood, and lift only when the pad has stopped.
Step 7: Move Slowly in Overlapping Passes
Move the sander in straight rows, slowly, about an inch per second, overlapping each row with the previous one by about half the pad. Then do a second set of rows across the first. With a random orbital sander you don’t need to follow the grain, because the random pattern leaves no straight scratches. Speed of movement matters more than you’d expect: moving fast feels productive but the abrasive does less work and the scratch pattern is less even.
Step 8: Let the Weight of the Sander Do the Work
Rest your hand on top to guide it and add no more than light pressure. Pressing down slows or stops the free rotation of the pad, and a pad that isn’t spinning freely leaves the repeating loops people call swirl marks. If the sander is not cutting, the disc is worn or clogged: change it.
Step 9: Keep the Pad Flat, Especially at the Edges
Never tilt the sander onto the edge of the disc to “dig in” on a spot. It cuts a dish into the wood, and heat from the edge damages the hook-and-loop pad. At the edge of a board, let the pad overhang a little, but not more than about a third of it, or the sander tips and rounds over the edge.
Step 10: Clean Between Grits and Check Your Work
Before each new grit, vacuum or wipe the surface, and change the disc. Then check the surface with a light held low and to the side. When the scratches from the previous grit are gone and the new pattern is even, move up. After the final grit, wipe with a tack cloth or a damp rag before applying finish.
💡 Pro Tip
Draw light pencil lines across the whole surface before each grit. When all the pencil is gone, you have sanded every area at that grit, and you haven’t lingered in one spot.
Do You Push Down on an Orbital Sander?
No. Guide it, don’t press it. The weight of the sander plus your resting hand is enough. Extra pressure feels like it should cut faster, but it slows the pad’s rotation, heats the disc, clogs it faster and leaves swirls. Some sanders make this easy to feel: if the pad visibly slows when you lean on it, you are pressing too hard. Light pressure with a fresh disc is always faster than heavy pressure with a dull one.
The 5 Most Common Random Orbital Sander Mistakes
- Too much pressure. Stops the random rotation and creates swirl marks. Guide, don’t push.
- Starting or stopping off the surface. A spinning pad landing on wood at an angle gouges it. Pad down first, then switch on.
- Tilting onto the edge of the disc. Digs a dish into the surface and cooks the pad’s hooks.
- Skipping grits or not cleaning between them. The coarser scratches stay, or loose coarse grit gets dragged around by the finer disc.
- Using a worn or clogged disc. Once the disc stops cutting, pressing harder only makes things worse. Discs are cheap compared with a ruined finish.
How to Use an Orbital Sander on Specific Jobs
How to Use an Orbital Sander on Wood Furniture
Use the orbital sander on the flat, open surfaces: tops, sides, drawer fronts. Stop short of inside corners and carvings, where the round pad can’t reach; finish those with a detail sander or by hand. If a piece has lots of corners, see my guide to the best detail sanders.
How to Use an Orbital Sander to Remove Paint
Start at 60 or 80 grit and a medium speed, because high speed melts paint and loads the disc in seconds. Keep the sander moving and change discs as soon as they clog. If the house or furniture could be from before 1978, test for lead before sanding at all. For big flat areas, a belt sander is faster; I compare both in my guide to the best sanders to remove paint, and chemical and heat methods in how to strip paint from wood.
How to Use an Orbital Sander on Hardwood Floors
A handheld random orbital sander works for a small room, a single damaged area or a light scuff between coats, but it is slow on a whole floor. Work in sections, keep the pad flat and always keep moving so you don’t leave a dip. For a full floor, a large orbital floor sander is the tool; my step-by-step guide on sanding hardwood floors with an orbital sander covers both.
Sanding Between Coats of Finish
Use 320 grit or finer at the lowest speed, a fresh disc and almost no pressure. You are only knocking down dust nibs, not removing finish. Stay well away from edges, where the finish is thinnest and easy to cut through.
What Are the Downsides of an Orbital Sander?
- It can’t reach inside corners. A round pad leaves an unsanded arc in every 90-degree corner.
- It is slower than a belt sander for heavy stripping and leveling large flat surfaces.
- Swirl marks if misused. Pressure, tilting and skipped grits all show up under stain.
- Discs cost more than plain sandpaper sheets, and you need the right hole pattern.
- Dust, unless you connect a vacuum. The onboard bag or canister is a compromise.
None of these are reasons not to own one; they are reasons to own a second tool for corners. My sheet sander vs random orbital sander comparison explains which pairs best with it.
Using a Sheet (Orbital Finishing) Sander Instead
Some tools sold as “orbital sanders” have a square pad that moves in a small fixed orbit and doesn’t spin. The technique is similar, with three differences: clamp a cut piece of ordinary sandpaper tight under both clamps so it doesn’t wrinkle; sand with the grain, because the fixed orbit leaves a more regular pattern; and use the square pad’s corners to get into inside corners, which a random orbital can’t do.
Random Orbital Sanders I’d Start With
All three are 5″ corded models with variable speed, which is what makes the speed advice above possible. My full comparison is in the best random orbital sanders guide, and cordless options are in my cordless sander reviews.
Bosch ROS20VSC 5″ Random Orbital Sander
Easiest to Learn On
A 2.5 A motor with a speed dial from 7,500 to 12,000 OPM, and a pad dampening system Bosch designs to reduce swirl marks, which helps while you are still learning how much pressure is too much. The twist-off micro-filter canister shows you when it is full.
DEWALT DWE6423K 5″ Random Orbital Sander
Most Control
A 3 A motor at 8,000 to 12,000 OPM in a low body that puts your hand close to the work, which makes it easier to keep the pad flat. A separate counterweight reduces vibration, the switch is dust-sealed and DEWALT backs it for three years.
Makita BO5041 5″ Random Orbit Sander
Best for Finishing and Paint
The widest speed range here, 4,000 to 12,000 OPM, so you can slow right down for sanding between coats and for paint that would otherwise melt onto the disc. The adjustable front handle gives you a second grip on big panels.
And the Discs: Mirka Gold Multifit 5″, 120 Grit
Mirka’s Multifit hole pattern is made to fit any 5″ dust-extraction pad, so it solves the hole-alignment problem from Step 1 whichever of the sanders above you choose. 120 is the grit you will go through fastest; buy the others as you need them.
🏆 The Bottom Line
Line up the disc holes, connect a vacuum, start and stop with the pad on the wood, move slowly in overlapping rows and let the sander’s weight do the work. Keep it flat, step up one grit at a time and clean between grits. Get those right and a random orbital sander leaves a surface that is ready for stain, with no swirls. For the grits to use on your project, see my sandpaper grit chart, and for the full sanding process, how to sand wood.
❓ Frequently Asked Questions
What are the 5 most common mistakes people make with a random orbital sander?+
Do you push down on an orbital sander?+
How do I attach sandpaper to my orbital sander?+
What are the downsides of using an orbital sander?+
How do you use an orbital sander to remove paint?+
Can you use an orbital sander on hardwood floors?+
Still getting swirl marks? Describe your sander, grit and finish in the comments and I’ll help you track down the cause.
