I see this problem all the time. The idea that if you apply a constant force on an object, it should move at a constant speed. Really, this is what Aristotle would say, right? There are two course ...
An automatic optical inspection rig uses a Bayside custom XYZ gantry on a composite base with caged, recirculating bearings. Specs: 0.1-m m resolution; 60-kg moving mass; straightness = ±5 m m/400 mm; ...