Drilling Crane and Winch Drum Components
Crane and winch drums are large rotating components that spool cable or rope. They need several types of deep holes — a through-hole for the drum shaft, and cross-holes for cable anchoring and hydraulic fluid passages. Over the years I have drilled drums for crawler cranes, offshore winches, and mining draglines, and each application brings its own set of challenges around interrupted cuts and part handling. The drum is typically made from carbon steel (AISI 1020 or 1045) or low-alloy steel (AISI 4140). A medium-sized crane drum might be 1-3 meters long with a 100-200mm bore for the shaft. The wall thickness is usually 30-80mm. For a large off-shore winch drum I worked on last year, the bore was 320mm through 4.2 meters of 2.5-ton casting. ...