When I make boxes, I typically tape down a full sheet of 150 grit sandpaper to the Table Saw to level the top and bottom of the boxes after they are glued up. The TS is one of the few dead flat surfaces in the shop where I teach. Being as this is a ‘portable’ situation, this is a pain because of having to tape and untape it each time. I want something to slap down on a bench and be able to quickly grab it to take it with me at the end of the day.
I’ve seen the ones using clip-board clips but the clips stick up too high for my liking. Here’s what I came up with:
I can clip a full sheet of sandpaper to it along the edge with readilly available binder clips, giving me use of almost the entire sheet of paper. The 3/4” MDF board has a 1/2” rabbet all the way around to allow it to sit flat on the workbench without resting on the binder clips as shown here:
In making this Rabbet, I’ve found that binder clips work best if they are opened up to almost their full capacity. You might gauge your rabbet to make this happen with the size of binder clips you plan on using.
By adding a 3/4” dowel to the center of the bottom, it holds itself in place on any bench with dog holes.
Gluing some 220 grit sandpaper to the bottom might be a good addition to keep it from spinning. I think this will be just the ticket for my mobile needs.
-- Backer boards, stop blocks, build oversized, and never buy a hand plane--