That would be a mighty expensive lead screw.
Personally I would be looking at either rack and pinion or belt driven for that length.
Definately try and drive the gantry from both sides, or make your gantry very wide so as to avoid twist. You may then need to make your machine a little longer so as to accomodate for the wider gantry. Still, drive it from both sides as a preference.
You can use the one big servo to drive it from both sides with drive shaft going across the gantry. It is possible to have 2 servos, one for each side, but there are other negative issues to consider there. |