Clamping workpieces at the drill press has always given me trouble. With a big auxiliary table, you need long clamps to reach into the center of the table. One day, an idea struck me.
Dual Fences. As you can see in the photo, my solution was to build a clamping bar that works with my fence. I made the bar with a few layers of plywood and a hardboard top. On the inside face, sandpaper adds extra grip. The bar slides into the fence T-track and can be tightened down with knobs and T-bolts. This allows the bar to sandwich a workpiece between it and the fence and hold it in place.