Hey everyone, I have a quick question. I'll first describe the setup.... I have a lead screw that is vertical with a carriage attached parallel to it (weighing roughly 50 lb). It is attached to a perpendicular gear at the top. Oh and the nut attached to the lead screw I believe is nylon. The gear at the top is attached to another gear parallel to it. The gear ratio is 4:1. The gear that the lead screw attached to is the smaller gear. Now the larger gear is attached to a motor perpendicular to it. What I would like to know is how I could find the torque needed to move that carriage up and down. We found that we need to move the leadscrew at 1200 RPM. The mean diameter is 3/8. I also know the leadscrew has trapezoidal thread. I know this might be kind of hard to follow, but I tried. lol I know there is more information you'll need, please let me know and I'll be happy to provide it for you. If it would help I can try to upload a picture of the set up that I have. Also just a side question. Does anyone know how to find the HP of a small motor? It's mounting size is 23.