Belt sanders, IMHO, are great tools when used for the intended purpose. Like many tools, however, they are often mis-used, and even for the intended purpose, require the development of some usage skills. Absent those skills, using them on large flat surfaces is certainly risky.
I use mine (an old Rockwell 4x24) quite often for edge sanding, particularly with pieces roughed out on the bandsaw. I made the fixture below to keep the edges square. The sander's handles simply rest in the supports, and there's a carriage bolt under the sander to adjust it square to the support table.
Last edited by Ralph Barker; 04-16-2009 at 08:47 PM.