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The ends of a digging bar are shaped for various purposes. [3] Typically, each end has a different shape so as to provide two different tool functions in one tool. Common end shapes include: Blunt — a broad, blunt surface for tamping. Point — for breaking hard materials and prying. Wedge — an unsharpened blade for digging, breaking and ...
The earliest rail chairs, made of cast iron and introduced around 1800, were used to fix and support cast-iron rails at their ends; [2] they were also used to join adjacent rails. [ 35 ] In the 1830s rolled T-shaped (or single-flanged T parallel rail ) and I-shaped (or double-flanged T parallel or bullhead ) rails were introduced; both required ...
Gripe (a specialized clamp, tightened with a wedge, for holding strakes in position when building a clinker boat) Hand clamp [1] Handscrew (upper right in the top photo) Holdfast, a bench clamp for holding things to a bench top or side The bench forms the fixed jaw. Magnetic clamp (see Magnetic base) Mitre clamp; Pipe clamp (top of the top photo)
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Illustration of a Jim crow from A Textbook on Civil Engineering — International Correspondence Schools published in 1899 by the Colliery Engineer Company.. A jim crow or rail bender is a tool for bending rails, consisting of a U-shaped or V-shaped armature with a hefty screw rod in its axis.
The most common form is a wedge-shaped piece of steel which fits over the top of the rail. [7] If a car or locomotive attempts to roll over it, the wheel flange is lifted over the rail to the outside, derailing it. When not in use, the derail folds away, leaving the rail unobstructed. [8]
The Moore family firm, the Moore Special Tool Company, independently invented the jig borer (contemporaneously with its Swiss invention), and Moore's monograph is a seminal classic of the principles of machine tool design and construction that yield the highest possible accuracy and precision in machine tools (second only to that of ...
Tapered shank tools are removed from a socket using different approaches, depending on the design of the socket. In drill presses and similar tools, the tool is removed by inserting a wedge shaped block of metal called a "drift" into a rectangular shaped cross hole through the socket and tapping it. As the cross section of the drift gets larger ...
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