use sanding machines
Use a power tool to grind or smoothen surfaces by abrasion with sandpaper. Attach the sandpaper to the machine and move it rapidly either by hand-holding it or fixing it to a workbench.
Use a power tool to grind or smoothen surfaces by abrasion with sandpaper. Attach the sandpaper to the machine and move it rapidly either by hand-holding it or fixing it to a workbench.