Quote Originally Posted by Jonathan View Post
Even when critical speed isn't a problem (as is the case with the rotating ballnut) you'll find the 10mm pitch screw wins over 5mm as the torque required to accelerate it is less, due to the kinetic energy of the rotating screw being 4 times less if the screw is only rotating at half the speed.
Okay you have less rotational inertia from the screw, but twice the pitch means half the driving force on the nut so your max accelerations go down.
Sounds a bit swings and roundabouts to me :naughty: