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Boxford Lathe was a brand of lathes produced by Denford Machine Tools from 1946 until 1952. The original factory was in Box Tree Mills, Wheatley, Halifax, West Yorkshire , England. Denford Machine Tools also produced other metalworking tools including precision measuring tools such as an optical comparator .
A Robertson screw, also known as a square screw [1] or Scrulox, [2] is a type of screw with a square-shaped socket in the screw head and a corresponding square protrusion on the tool. Both the tool and socket have a slight taper .
The first turret lathe was built by Stephen Fitch in 1845 to manufacture screws for pistol percussion parts. [2] In the mid-nineteenth century, the need for interchangeable parts for Colt revolvers enhanced the role of turret lathes in achieving this goal as part of the " American system " of manufacturing arms.
The shell then screws onto the arbor just as old-style lathe chuck backplates screw onto the lathe's spindle nose. This method is commonly used on the 2" or 3" boring heads used on knee mills. As with the threaded-spindle-nose lathe chucks, this style of mounting requires that the cutter only make cuts in one rotary direction.
Hand cranked, 3 ⁄ 8-inch bore, 5 ⁄ 8-inch stroke, 4.5 inches long. Pillar Drill 9-inch-high miniature pillar drill for the model workshop. Lathe 8.5-inch-long miniature lathe for the model workshop. Shaper 6.5-inch-high miniature shaper for the model workshop.
Before about the beginning of the 19th century, these were used in pairs, and even screws of the same machine were generally not interchangeable. [13] Methods were developed to cut screw thread to a greater precision than that of the feed screw in the lathe being used. This led to the bar length standards of the 19th and early 20th centuries.