A spindle sander has a cylinder of sandpaper that rotates at different speeds. This is great for sanding off very tight curves and details that would be difficult to do on a belt/disc sander or by hand. The spindles come in various widths and grits and can easily be changed out to suit your needs.
Models at EXP
JOSS-S Oscillating Spindle Sander (x1): Work table tilts 45° front and 15° back