Hi All. I am looking to determine the torque/power/rpm. needed to lift a 4 kg. load 150 mm vertically in 10 seconds. I need to use a 6 volt dc. gear motor mounted vertically and connected to a 12 mm dia. acme lead screw ( steel ) with a 3 mm pitch and 48 % efficiency. The lead screw nut witch the load is connected to is also steel. The load guide is a steel tube with a brass bearing. Please see attached drawing. Best regards and thanks in advance.