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Adan - Not sure about the 8" chuck on your lathe. The 4 jaws supplied with these lathes are the 160mm as you know. The suppliers obviously reckon that 160mm is the most suited - a bit easier on the headstock bearings perhaps? I have a 200mm as supplied to go on my WARCO BH600G but the lathe is that much more heavy duty . By the way - the 200mm chuck is a bit of a beast. I have to use a winch to lift mine as I cannot even lift it of the floor where it lives. So my advice would be to stick with the 160mm although it would be interesting to hear what others think.

I have to machine a Delrin bar end to shape three recessed areas that will couple with a socket. The diameter of the bar is 80 mm and the recessed areas are 8 mm deep and spreading through sectors of 60* and 17 mm width. I am mounting the bar on a rotary table and I was thinking about machining it in a mini milling machine. I don't have much experience with milling and when I was thinking about how to set the work, I was wondering what would be the best approach: Setting the RT horizontally, part vertically, and then mill with an end-mill from the top of the part while rotating the table.