I have had a Unimat 3 for over 30 years in that time I only ever used it to make model ship fittings. I have decided to try my hand at a simple steam engine and some members here gave me some good ideas. I recently purchased a larger lathe (7 x 12 Metal Worker Lathe ...same as the Micromart 7 x 14 lathe) and a Micromart mini milling machine. As I have used mostly "soft " metals before I need some advice about the harder metals like CRS. Also how deep should I make the milling cuts for any metal? Also on the mini lathe (an MT 3 ) I find that the drill chuck that came with the lathe tends to fall off when doing milling. I have put in the collet with a bolt as a draw bar and it appears to wobble a bit. What am I doing wrong?