Skip to Main Content
Skip Nav Destination

Severe damage to the jib of a dragline excavator resulted from failure of the shaft which carried the derricking sheaves at the apex of the "A" frame. Failure occurred within the hub of the center sheave of the group of three at the right-hand end of the shaft. The shaft was manufactured from a 0.5% carbon, 1% chromium steel heat treated to give a hardness value of 300 VDP. The material was in the hardened and tempered condition and showed no abnormalities which would predispose to early failure. The content of non-metallic matter was only of nominal amount. Failure...

You do not currently have access to this chapter.
Don't already have an account? Register
Close Modal

or Create an Account

Close Modal
Close Modal