Hi guys Im new to the site and was hoping for some information. Im currently working on a design to interchange different punching tools in a forging press. These tools are screwed into the punching piston and then the press forges metal objects. My question is this: I am tasked with installing a hydraulic torque wrench to screw new tools vertically (against gravity) into the piston head. How can i calculate the amount of torque required to overcome the weight from gravity and, more importantly, the resistance of the friction of the two threads meshing? I assume the specs of the threads have something to do with it but I dont recall learning anything along those lines at university. Thanks in advance. Sean.