Thanks @Voicecoil and @JAZZCNC for both replying to me it very much appreciated

Good news about the standard ballscrew having low backlash

@JAZZCNC I see your point about the pitch of the 1605 will result in slower speeds, I guess i can live with this for a bit but upgrade the Y axis once everything else is up and working, For the two X axis at 1200mm do you think 1610 will be be ok for the this length or should i push for 2010 or 2510 ?

Sorry if this is silly question but If I use a larger pitch does this require more force out of the stepper motor and if so is there a resource that i can get this info from

Many Thanks

James