Everyone seems to talk about using a drill press as a mortiser but no one ever mentions using a mortiser as a drill press. I've never used a mortiser before, although I get the general idea of how they work. But even so, I can't figure out what aspect of the mortising machine would eliminate dual use as a drill press. Is it just a matter of fitting a different chuck? Must be something I'm not considering that limits a mortiser by design from being used as a drill press.