I always found myself needing a bench mounted disc of belt sander for rounding edges of wood mainly when building wooden toys for my son. Being a tight ass meant that shelling out NZ$180 for a unit like the one in the photo was not an option especially since i could get a bottom end angle grinder for only NZ$15 + a snading disc attachment for $NZ8
Mount it to a box, add a solid work surface and TADA a 10000rpm wood destroyer..!!
Step 1: Find a suitable box
First find or make a wooden box - at least one side and the top must be pretty square to each other. I used an old nail box.
Step 2: Procure cheap angle grinder
Buy the cheapest angle grinder you can find, this one cost me $NZ15 for 10,000rpm and a 12 month warranty. 100mm is the smallest available but you could get bigger.
Also get a disc sanding attachment, either the sticky back type or the velcro type will work.
Discard the angle grinder handle and safety guard, then attach the sanding disc to the spindle.