A thickness sander is typically a drum sander. Although a thickness sander may use a belt instead of a drum.What is the difference between a thickness sander and a drum sander.. They seem to be using the term interchangeably on line here and there, yet yourself and Ger imply that there is a difference...
And a thickness sander doesn't necessarily have to have a power feed.
But a drum sander isn't always a thickness sander. See Carveone's.
Imo, a thickness sander can be a much more precise device than Carvone's sander.