Cheers all

BillTodd I looked up you roller nut for your mill conversion when I was wondering what would be a good low cost ballscrew alternative. Are you still using this and if so how is it going? I would be interested to see how the nut has worn. I decided against it as the chosen solution for a couple of reasons:

mainly space - it is tight enough with the current arrangement and i am not sure that I could have got a roller screw to fit without making it more complecated
Time - it seemed a time consuming (but rewarding) method

but could see the efficiency advantage.