Thanks for your input Neale, just read your thread - great work on documenting everything so thoroughly!! It'd be nice to see some photos of the entire machine, looks like I'm heading along a similar path to you.

Interesting what you say about the R&P. My understanding of the ballscrew / R&P decision was that although ballscrews are more accurate & efficient anything over 1m should use R&P because the ballscrew whipping limits performance - is that correct? There doesn't seem to be much of a cost difference between the two?