I made this edge sander a few years ago with some left over three quarter inch plywood. The top piece is varnished birch for ease of sliding the piece to be sanded. The motor is a 1750 rpm furnace blower motor with a threaded mandrel and a large drill chuck threaded on to the mandrel. The height of the sanding drum can be changed by chucking the drum at different lengths into the chuck. After using it for a while and being dissatisfied with gouging the work if you fed it through too slow, I made a fence as you can see in the picture, that eliminates gouging. Sort of works like a router table fence. I found the fence most helpful in sanding the edge of a circle, set the fence so that the drum just touches the circle and then rotate the piece using the fence as a "stop". You may have to use a smaller drum for this. It of course doesn't oscillate but by using different grits of sand paper it does a pretty good job. It is also helpful if you have a small amount to pare off a piece of wood rather than use a table saw for a thin cut. All in all it gets lots of use, especially after the band saw cuts.