Quote Originally Posted by IanS1 View Post
Any thoughts on the gantry would be very much appreciated.

Ball screws: Would a 16 be OK to use on the Y axis or would I be better off using a 20? It's going to be about 2000mm long.
Gantry will be fine Ian it's tried and tested. 2000mm is just too long for 16mm so definately go with 20mm. To be honest at this length it's worth using 20mm pitch not 10mm and using a 2:1 ratio so you get the same speed as 10mm pitch but half the screw speed. This reduce chances of Whip.
The ratio increases torque as well so your in front here as well thou the higher pitch looses some mechanical advantage but still your in front and the slower screw speed is more beneficial as the inertia is lower than 20mm 10mm pitch screw.