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The Northern 1/4 Ton is a small recreational keelboat, built predominantly of fibreglass. It has a masthead sloop rig, a transom-hung rudder and a fixed fin keel. It displaces 3,400 lb (1,542 kg) and carries 1,450 lb (658 kg) of ballast. [1] [2] [4] The boat has a draft of 4.00 ft (1.22 m) with the standard keel fitted. [1] [4]
The first punch & die type tool for notching tube & pipe was invented in Chicago by Julius Vogel, who was issued a US patent in 1938. [1] The accuracy of punch notching is good, depending on the care with which it's carried out. For manual folding work, prior notching can often improve resultant accuracy of the folding itself.
A die cuts an external thread on cylindrical material, such as a rod, which creates a male threaded piece that functions like a bolt. Dies are generally made in two styles: solid and adjustable. An adjustable die may be adjusted either by an integrated screw or by a set of screws set in to the die holder (termed a "die stock").
The civilian version of the Mighty Antar was developed in the late 1940s as an oilfield vehicle for transporting pipes over rough ground. [1] They were of 6×4 layout (i.e. six wheels, four of them driven), with the front (steering) axle undriven and with twin wheels on both driven (rear) axles (technically ten wheels, eight of them driven, as each rear axle has four wheels).
A die is a specialized machine tool used in manufacturing industries to cut and/or form material to a desired shape or profile. Stamping dies are used with a press, [1] as opposed to drawing dies (used in the manufacture of wire) and casting dies (used in molding) which are not. Like molds, dies are generally customized to the item they are ...
The half-angle (between the taper surface and the axis of the pipe) is arctan(1 ⁄ 32) ≈ 1.7899° ≈ 1° 47′. The standard for Nominal Pipe Size (often abbreviated NPS, which should not be confused with the abbreviation NPS for the straight thread form standard) is loosely related to the inside diameter of Schedule 40 series of sizes.
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