Hi Jon,

No problem on the double post's, I have taken care of this for you. Not sure if the link to 1500mm x 1000mm is supposed to be there so I have left it.

Good luck with the build, as noted I would consider going with 20mm rails and if you can Ball screws on each axis. 16mm will work as you know but I would too rather see 20mm rails over a 1500mm length, you could always go to 80x80 profile for the Y axis and this would give you the 40mm centre’s the rail would require for mounting, however 80x80 is not cheap I know so...

Preparation for a 4th axis at this stage would be a good idea, people have been known to bolt a 4th axis to the y table as and when they need it.

Regards,
.Me