Random Orbital Sander

A random orbital sander spins its round pad in a small circular orbit while the pad itself also rotates independently and somewhat unpredictably — the combination is what "random" refers to. That randomness is the entire point: it prevents the sanding pattern from ever repeating in a visible, consistent swirl, which is exactly the flaw that plagued older fixed-orbit finishing sanders.

Why it's the default finish sander

For the last sanding step before finish goes on, a random orbital sander leaves a surface that reads as scratch-free to the eye even though, at a microscopic level, it's obviously still abraded. It's aggressive enough to move through a real grit progression at a reasonable pace, and controlled enough not to leave the visible cross-grain scratches a belt sander would.

What actually matters

• Pad size — 5" is the standard for general furniture work; 6" pads cover more area per pass and suit larger panels, at the cost of some maneuverability in tight spots.
• Variable speed — useful for backing off on delicate veneer or figured, tear-out-prone grain.
• Dust collection that actually connects to a shop vacuum, not just the built-in dust bag, which catches a fraction of what a real vacuum pulls through the pad's holes.
• Vibration and grip comfort — this tool gets used for long stretches at a time, and a sander that fatigues your hand in ten minutes will get used less carefully, not more.

Working through a grit progression

Skipping grits is the most common way people waste time on this tool — jumping from 80 to 220 leaves the coarser scratches from 80 still visible underneath, just harder to see until finish goes on and reveals them. A steady progression (80 → 120 → 150 → 220, roughly) removes the previous grit's scratches fully at each step rather than papering over them.

A note on dust

Fine sanding dust from extended random orbital use is a real, cumulative respiratory hazard, not just a housekeeping annoyance — dust collection and a properly rated respirator matter here as much as on any other sander, arguably more given how much time this particular tool spends in your hands.