Скачать или смотреть Recreation of Steel Trident from Yale University

Yale University Jonathan Edwards College A Recreation:
Blacksmith Samuel Yellin's Forged Steel Trident Lattice

Challenge: In the college’s Dining Hall, four of Yellin’s finely crafted wrought metal lattices form part of the partition dividing the central hall from the food service area. One of these lattices was missing. Shawmut presented us with an existing lattice as a sample. The lattice is composed of the trident with its head, collar, shaft, and four cross pieces. Our first task was to duplicate this original trident. In an x-ray of a root canal process, three flexible broaches-small files used to clean the nerve canals-show the same natural pattern as Yellin’s Trident. With an analytical drawing, we described our trident’s parts.

Why make the Trident Lattice this way?
Yellen’s forgings came from a workshop that was born in the 19th century, with its unique tools, craftsmen, and workshop environment. This Trident lattice could be made by a blacksmith today. But its singular, precise reproduction, rather than its original multiple manufacture, is most efficiently achieved by blacksmithing combined with detail-oriented silversmithing and precision machining.

The sides of the three diamond-shaped teeth are tapered. To match the original slopes, the sides of each tooth are cut with a milling machine. Next, we forged the S-curved side teeth on the horn of an anvil. The tapered steel is heated to ‘red heat’, or, 500-1000 degrees Celsius. The forged taper is cut to match the original tooth shape, then each tooth’s form is refined. The root is cut from a block of steel. After the diagonal faces of the root are formed, each root branch is drilled to receive its spline. Like building the filling for a human tooth, hidden rods—splines—reinforce the joints. Unlike rebuilding a human tooth, this steel root and teeth are heated to over 650 degrees Celsius-to the melting point of silver solder-which fills the joints’ spaces, locking them together. Lines are then scribed to guide the grinding and filing which will yield the final shape.

After the final shape has been roughed out, yet another spline is build to connect the trident, shaft, and collar. Now, with the trident, collar and shaft almost ready for assembly, the collar is shaped and hammered as was Yellin’s original.