Thanks very much for your input JAZZCNC, I'm busy pricing up 2010 end machined ball screws and getting even more confused with this end machining terms like " MPF, IDE, FUS, WFR, WWF, DGK, MPH" no idea what it means. Could I use 2010 on the X axis (1500) and drop down to 1610 for the Y axis ? Would this cause problem setting the machine up ?

As for the profiled linear rails I can't find the lengths I need on ebay and uk supplier prices put it well out of my limited budget, looks as if I will have to go with supported round rails.

Mike