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Originally, all tool bits were made of high carbon tool steels with the appropriate hardening and tempering.Since the introductions of high-speed steel (HSS) (early years of the 20th century), sintered carbide (1930s), ceramic and diamond cutters, those materials have gradually replaced the earlier kinds of tool steel in almost all cutting applications.
In the 20th century, bedpans were made of ceramic, enamel, or stainless steel, and after the 1960s, bedpan materials expanded to include plastics and disposable substances. [6] The initial bedpan patent US2243791A was created in the United States in the 1940s. Today, most bedpans are made of stainless steel, plastic, or disposable materials ...
Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver.This form was the first type of screw drive to be developed, and, for centuries, it was the simplest and cheapest to make because it can just be sawed or filed.
Liner bushings, sometimes called master bushings, are permanently installed into the jig and accept liners that can easily be replaced. Press-fit wearing bushings are used in short run applications or in applications where the tolerance on a hole location is so tight that it cannot facilitate the use of a liner bushing.
Wireline core drilling is a technique used to extract the core without having to retrieve the entire drill string of rods, which generally only needs to be retracted when the hole is finished or the drill bit must be replaced. Drill rod extensions are added at the top as required to extend the string as the hole gets deeper.
A butler's sink is a rectangular ceramic sink with a rounded rim which is set into a work surface. [5] There are generally two kinds of butler's sinks: the London sink and the Belfast sink. [ 5 ] In 2006, both types of sinks usually were 61 centimetres (24 in) across and 46 centimetres (18 in) front-to-back, with a depth of 22.5 centimetres (8. ...
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Comparison of countersunk and counterbored holes. Counterbore cutter marked 'E A counterbore hole is usually used when the head of a fastener, such as a hex head or socket head capscrew, is required to be flush with or below the level of a workpiece's surface.
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