Thanks Terry.That is correct, This is the new jack which just failed after 8 months. I also think its much safer than what we have been doing. My next big question is how much torque it will take to turn a well greased nut on the threaded studs. I have tried different methods for calculating...
I think I've attached a couple of pictures.
Mikey41 http://files.engineering.com/getfile.aspx?folder=095adf43-c81a-40ff-9d96-92fc1211564c&file=DSC00231.JPG
I don't understand how to post photos yet. But imagine this: A machine screw jack with an acme 4 inch dia screw thread coming out of the top. The base of the jack is bolted to a pivoting plate by 4 1-1/4 inch bolts. The upper end of the screw is attached, vi a clevis and blade, to the load...
I am new to this group and have a problem to discuss.
I have a 25 ton machine screw jack, used as an actuator, which has failed in service. The jack in this application is normally in tension,
up to 28,000 lbs. This structure is 40 feet in the air. A crane is not available nor usable as this...
