Gantry advice please

[Crunch]

Yes those are correct bearings. Just tell Fred the f length you require but as I have said the ball screw length includes the f length . Its an easy mistake to make.

So just order say ball screw machined both ends 1610 x 1200 with f length of 30mm

(where 1200 is the total length)

For the avoidance of doubt my router has twin screws twin motors and the screws are 1450mm overall. Motors nema 23 . without any problems.

Are your ball screws 1610 or 2010 ??
How heavy is your gantry, roughly ??