Advice required. If you were designing a steel framed router with rails 1800mm (X axis) and 1500mm (Y axis) and 620mm (Z axis) what size and pitch ballscrews would you use.
Because of the lengths of the X and Y axis they appear to be beyond the 1610 ballscrew because of whip, etc. I could use BK bearings at both ends but not sure what benefits that would provide.
I was thinking 1616, 2010 or 2020 for the X, maybe 1616 for the Y axis and 1605 for the Z axis although some of these seem expensive. Any suggestions?

Jim