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Needle threader and usage with a needle. Typical needle threader. A needle threader is a device for helping to put thread through the eye of a needle.Many kinds exist, though a common type combines a short length of fine wire bent into a diamond shape, with one corner held by a piece of tinplate or plastic.
A model 27/127 coincidentally weighs 27 pounds (12 kg), plus the weight of its motor; treadle or hand crank; light; and case or cabinet. Such a weight strains the meaning of the term "portable", even when fitted with only a hand crank and minimal wood case. By comparison, today's laptop computers typically weigh 3 to 5 pounds (1.4 to 2.3 kg).)
The number series of machine screws has been extended downward to include #00-90 (0.047 in = 0.060 in − 0.013 in) and #000-120 (0.034 in = 0.060 in − 2 × 0.013 in) screws; [3] however, the main standard for screws smaller than #0 is ANSI/ASME standard B1.10 Unified Miniature Screw Threads. This defines a series of metric screws named after ...
where is the tap drill size, is the major diameter of the tap (e.g., 10 mm for a M10×1.5 tap), and pitch is the pitch of the thread (1.5 mm in the case of a standard M10 tap) and so the correct drill size is 8.5 mm. This works for both fine and coarse pitches, and also produces an approximate 75% thread.
A full (100%) UTS or ISO thread has a height of around 0.65p. Threads can be (and often are) truncated a bit more, yielding thread depths of 60% to 75% of the 0.65 p value. For example, a 75% thread sacrifices only a small amount of strength in exchange for a significant reduction in the force required to cut the thread.
In manufacturing, threading is the process of creating a screw thread.More screw threads are produced each year than any other machine element. [1] There are many methods of generating threads, including subtractive methods (many kinds of thread cutting and grinding, as detailed below); deformative or transformative methods (rolling and forming; molding and casting); additive methods (such as ...