Hope that this is not too far off topic.
Cast Iron is a) dirty and b) abrasive if it gets between the sliding surfaces, so I try to minimise it's passage around the lathe.
To this end, a powerful magnet is placed about where the swarf will fall, and then covered by a sheet of newspaper, (which is tucked out of the way of the chuck and its jaws).
Most of the swarf then flies towards the magnet, and at a suitable time, the newspaper is removed and folded to funnel the cast iron swarf into a suitable receptacle, leaving a clean machine.
Brass, I machine dry, and ruefully accept the fountains of small chips flying about the place. Again, if possible, I use newspaper, (without the magnet!) to try catch as much as possible. A pastry brush makes a pretty good means of moving the rest to where it can be disposed of without too much trouble.
Howard