METAL THERMAL EXPANSION CHART
Please allow this to run-it's-course. Then I can say I tried my best. ALUMINUM / COPPER / STEEL (set screw). This is what I have been yelling about... Metal Temperature Range (oF) Thermal Expans...
Forum Discussion
On the 100 ton punch press that we had at Weiser Lock, they would heat the 24" long bolts to say 300F, then install them to a certain torque, before they cooled back to room temperature. It put a lot more pull on the bolts and held them very tightly. They where 3" and 4" diameter bolts with about 8 threads into the attachment side.
Now they have a new system. They use cap screws to raise the bolt into place. So basically you hand tighten the bolt into place. Then by tightening about 20 allen head screws to around 100 foot pounds, it will raise the head of the bolt from it's mounting surface, stretching the 3" bolt enough to put the equal amount of pressure on the fittings.
Fred.
Now they have a new system. They use cap screws to raise the bolt into place. So basically you hand tighten the bolt into place. Then by tightening about 20 allen head screws to around 100 foot pounds, it will raise the head of the bolt from it's mounting surface, stretching the 3" bolt enough to put the equal amount of pressure on the fittings.
Fred.
