No problem mate and brilliant! I've always been tempted to get a Sherline spindle and motor for my CNC. They are really well made and have a lot of power and run quietly. I currently use Kress, no load speed good but if you need any power, speed drops dramatically which makes it really hard to get the speed right. And I find they get very hot. With a Sherline spindle you've got very good speed control and it would be quite happy with a 1/8" end mill or a 2 inch fly cutter. My lathes 12 years old now, never adjusted, origional belt and still perfect. Made 8, 48mm diameter cast iron wheels with it once, it never complained a bit. Never tried to swap the one on the lathe in case of accidents though. They are very nice machines! It should be happy with mild steel but yes, coolant will help a lot, with ali or brass you can use just water or if you don't push it too hard, compressed air. Anyway, it's all about having fun!

This is my rather over engineered beasty:

Some tests during a "rebuild"

http://www.youtube.com/watch?v=8MmqX...eature=related

Some quick moves to test for following errors after the "rebuild". It has one serious limitation, the data packets are RS232 so that limits complex moves to about 10 a second, circles or arcs are just one command so can be quick. MACH3s innovative use of a parallel port leaves it in the dust (which there is an awful lot of!).

http://www.youtube.com/watch?v=KGCIQ...eature=related

Tom