shank

A shank is a long-handled ladle used to transfer molten metal between furnaces, crucibles, or directly into molds. The tool consists of a metal bowl or cup at one end, typically holding 5 to 50 pounds of liquid metal depending on the foundry operation, with a shaft up to 4 or 5 feet long. The handles are usually wrought iron or steel bars welded or riveted to the bowl, angled outward to give the operator a secure two-handed grip while keeping distance between body and the radiant heat of the metal.

Shanks come in several patterns. A teaspoon shank has a shallow, elongated bowl suited to skimming dross or transferring small quantities of high-melting-point alloys. A round shank carries a hemispherical bowl for general pouring and is the workhorse of most jobbing foundries. Rectangular or oval bowls appear in specialized applications, such as continuous casting of aluminum or transfer of heavy iron charges. The bowl may be cast as a single piece or built up from sheet metal and riveted, with the latter construction allowing replacement of a worn bowl without discarding expensive handles.

The critical issue with shanks is thermal cycling. Metal transferred to a shank arrives at 1200 to 2900 degrees Fahrenheit depending on the alloy. Heat conducts along the shaft faster than the operator's hands can sense danger, and wooden handles or leather grips char and fail without warning. Modern practice uses ceramic fiber wrapping or cast refractory sleeves covering the lower two-thirds of the handle. The bowl itself must resist thermal shock; cast iron works for gray iron and steel, but non-ferrous shops often require silicon carbide or specialized high-temperature ceramics to avoid cracking under rapid temperature swings.

The name "shank" comes from the Old English word for leg or shin, referring to the long, leg-like shaft of the tool. In some regional British foundry vocabulary, the tool is called a "ladies" or "skimmer," though these terms have largely fallen out of use. The shank is distinct from a crucible tongs, which grips a container, and from a poker or rabble, which stirs molten metal in situ.

Operator technique determines both safety and accuracy. A shank should never be filled more than three-quarters full to prevent sloshing; excess heat radiating from an overfull bowl degrades the handle rapidly. The operative lifts with the legs, not the back, and pours from the side to maintain control and avoid trapping steam if the mold is even slightly damp. In high-volume production, two-person teams are common, with one operator steadying the mold while the other pours, reducing risk of spill.

Metallurgical considerations affect shank choice as well. Aluminum and its alloys require immediate transfer because oxide films form rapidly on the surface; a shank with a bowl designed for minimal surface area exposure is preferred. For cast iron, which remains fluid longer, a larger shank capacity reduces the number of trips to the furnace, lowering labor cost. Stainless steel and exotic alloys demand ceramic-lined bowls because iron contamination from a steel shank ruins the charge.