When faced with polishing small workpieces, in addition to using a belt sander, you can also use a small handheld polisher.
The smaller the tool, the more control the operator has over it, so the smaller the tool, the more it is used for finishing or fine grinding.
Polishing machines contain a 1-in-6-inch polishing disk size, which allows for grinding and polishing operations on small workpieces.
These tools can be used in three different combinations, one, with a sticky disc and a backed abrasive.
Second, use a rotary locking disc for grinding and polishing.
Third, you can also use the corresponding size of the sticky ball of wool or sponge use.