How to Use an Orbital Sander: Technique & Grit Guide

How to Use an Orbital Sander

An orbital sander is one of the more forgiving power tools in a shop, but "forgiving" isn't the same as "impossible to mess up." This guide covers the full step-by-step technique for flat surfaces — grip, feed pattern, grit progression, dust collection — and then extends that technique to rounded edges and curves, since a lot of what trips people up shows up exactly there. Looking for buying advice instead of technique? See our Best Orbital Sander guide.

How to Use an Orbital Sander: Step by Step

The fundamentals are simple, but each one matters more than it looks:

• Attach the right sandpaper for the pad size and secure it fully — a loose sheet flaps and sands unevenly.
• Connect dust collection before you start, either the sander's own bag or a shop vacuum, so you're not sanding blind through your own dust cloud.
• Hold it with both hands and let the sander's speed do the cutting — pressing down hard doesn't remove material faster, it just wears out the abrasive and your arm.
• Turn it on before it touches the wood, then lower it onto the surface, rather than starting it while it's already resting on the piece.
• Keep it moving in slow, overlapping passes — side to side or in a loose circular pattern — rather than holding it still in one spot, which digs in and leaves a low spot.
• Check your progress by feel as much as by eye — running your fingertips over the surface often reveals rough spots before your eyes do.

Grit Progression

Work through grits in order rather than skipping ahead — each step's job is to remove the scratch pattern the previous grit left behind, and jumping too far ahead just means those scratches show up in the finish. A typical progression starts around 80 or 100 grit to remove mill marks or level a rough surface, moves to 120–150 to refine it, and finishes at 180 or 220 grit for most projects before stain or a clear coat goes on. Not sure exactly what counts as medium grit in that range? Our medium sandpaper grit guide breaks it down. Browse the grit range this kind of work typically uses in our Sandpaper Medium Grit collection.

Using an Orbital Sander on Curved Surfaces

The technique above works well on a flat panel, but a curved or contoured surface changes things. A flat orbital pad wants to sand flat things — press it against a curve the same way you would a tabletop, and it tends to flatten the high point or leave facets (small flat spots) instead of a smooth, continuous radius. It also can't physically reach concave contours, tight coves, or crevices, since the pad and housing need clearance the shape doesn't offer. And because stain absorbs differently depending on final sanding grit, a curved section that gets rushed through fewer grits than the surrounding flat surface often shows up as a slightly different shade once finish goes on, even though the bare wood looked identical beforehand.

Tools That Help on Curves

• The orbital sander itself still handles broad, open curves and rounded edges reasonably well, as long as the technique adjusts (see below).
• Flexible foam sanding sponges conform to a shape far better than a rigid pad, and their two-sided design spreads finger pressure evenly, which matters a lot on contours.
• Radius or profile sanding blocks are worth having if you're maintaining a specific, known curve — they hold a consistent radius in a way freehand sanding can drift away from over a long edge.
• A stationary spindle sander is worth having too if inside curves and coves are a regular part of your work — see our spindle sander guide for how it compares to hand methods on tight, repeated curves.
• Folded sandpaper or a loose sheet handles tight recesses and end grain that nothing else can reach.

Sanding a Rounded Edge or Outside Curve

For a broad rounded-over edge, work from the center of the curve outward in overlapping passes, rather than holding the sander flat against one section — this is what keeps the curve continuous instead of leaving a series of flat facets. Move around the entire edge this way before going back over any one spot twice. Light, even pressure matters even more here than on a flat panel, since it's easy to dig into one side of a curve without realizing it. If the edge needs to hold a specific, consistent radius — like a guitar body edge or a matched set of curved parts — follow up with a foam-backed radius block shaped to that curve to true up any inconsistency the orbital sander left behind.

Sanding Contours, Corners, and Crevices by Hand

Wherever the orbital sander's pad can't fit — inside coves, tight corners, routed profiles — switch to hand sanding. A folded piece of sandpaper or a foam sanding sponge gives you the control a power tool can't in these spots. When sanding with your fingers directly, press as evenly as you can across the width of your fingertips; gaps between fingers are a common way to leave faint ridges in a contour. For an end-grain round-over specifically, use a loose, unbacked piece of sandpaper in a shoeshine-style back-and-forth motion rather than sanding straight across the grain — this avoids the scratches that a rigid backing and a fixed sanding direction would leave on end grain. Then hand-sand every curved or contoured section to the same final grit you used on the flat surfaces — commonly 180 or 220 — so the whole piece takes stain evenly.

Common Mistakes to Avoid

• Pressing down hard instead of letting the sander's speed work. This wears out abrasive faster and doesn't actually speed up material removal.
• Holding the sander still in one spot, which digs a low spot into flat surfaces or flattens the high point of a curve.
• Skipping grits, which leaves the coarser scratch pattern visible under the finish.
• Stopping a hard-to-reach contour at a coarser grit than the surrounding flat surfaces, which shows up as uneven stain color later.
• Sanding end grain across the grain with a rigid backing instead of using a loose sheet and a shoeshine motion.

Orbital Sanders We Carry

Virutex LRE46L Orbital Sander — $323.15

A 2mm micro-orbit and electronic speed control give this sander a light, controlled touch that's well suited to general finish work, rounded edges, and broad curves without gouging. View this orbital sander →

Virutex RTE146L Rotary Orbital Sander — $300.15

A more aggressive rotary-plus-orbital action for removing more material faster before switching to a lighter finishing pass. View this rotary orbital sander →

See both, plus our full lineup, in the Orbital Sander collection. Want the step-by-step technique for flat panels laid out on its own before tackling curves? Read our full orbital sander how-to guide. Refinishing older furniture with lots of curves and profiles? Our best sander for furniture guide covers picks suited to that kind of work.

FAQ

How do you use an orbital sander?

Attach sandpaper securely, connect dust collection, turn the sander on before it touches the wood, hold it with both hands using light pressure, and keep it moving in overlapping passes while working through a grit progression from coarse to fine.

What grit should I start with on an orbital sander?

Start around 80–100 grit to remove mill marks or level a rough surface, then move through 120–150, finishing at 180–220 grit for most projects before stain or a clear coat.

Can I use an orbital sander on curved surfaces?

Yes, for broad, open curves and rounded edges — work from the center of the curve outward with light, even pressure. For tight contours, coves, and crevices the pad can't reach, switch to hand sanding with a foam sponge or folded sandpaper.

Why does my orbital sander leave swirl marks?

Usually from pressing too hard, holding the sander still in one spot, or stopping at too coarse a grit before finishing. Let the sander's own speed do the work, keep it moving, and finish at 180–220 grit for a swirl-free result.