Crane Wire Barrel
During final machining one section of this crane wire barrel was accidentally reduced by 12.5 mm (½”) beyond the required diameter. It was impossible to reduce the rest of the barrel to the same diameter because of the strength factor. Metal spraying was used to build up the surface of the mis-machined area back to the originally specified diameter. A continual groove was then machined into the barrel to accept the feed of the wire rope. The Metallisation Arc Spray specification was – a bond coat followed by a build up of S20 to the required thickness, i.e. a 6.25mm (¼”) on the radius. It will be appreciated that the service conditions in which the barrel operates together with the constant squeezing action of the rope places a considerable load on the metal sprayed deposit; the surface has stood up to the treatment in a perfectly satisfactory way.
