Random Orbital Sander - Best Tools for the Weekend Warrior - DIY Essentials - Bob Vila
Random Orbital Sander
A convenient, one-handed tool, the random orbital sander is driven by an electric motor. The motor spins a shaft on which a counterweight is mounted, causing the sander to spin and wiggle, never the same way twice. The tool does a neat job, producing little or no scratching across the grain. Using prefabricated sandpaper disks, available from coarse to fine, it can remove lots of material quickly or produce a fine finish.