Hi all, In a nutshell: What spec motor do i need to use to lift 8000N vertically using a ball screw? and/or Is the a conversion of motor power torque etc to linear force? The long winded version: I'm currently designing a mobile patient hoist, and I want it to have a 150mm diameter circular telescopic mast. The hoist will lift 200kg (1962N load) at the end of a boom. So the force required by the telescopic mast to lift the load will be in the region of 8000N. Still with me? I want to put a mechanical actuator inside the mast to provide the lift, but am struggling to find any linear actuators which have the motor in-line rather than at 90 degrees. So, Iâ€™m thinking, is it possible for me to source a separate ball screw and motor and make my own? And if so, how do i go about working out what sort of spec the motor should be to lift such a weight. And would such a motor actually fit inside a 150mm diameter tube? Enjoy!