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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.
It is a thin, tapered metal shaft, coming to a sharp point, either straight or slightly bent. These shafts are often in the form of interchangeable needles. They usually have an eye piercing at the pointed end to aid in drawing thread through holes for the purpose of manual lockstitch sewing, in which case it is also called a sewing awl ...
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 ...
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 sewing needle. A sewing needle, used for hand-sewing, is a long slender tool with a pointed tip at one end and a hole (or eye) to hold the sewing thread.The earliest needles were made of bone or wood; modern needles are manufactured from high carbon steel wire and are nickel- or 18K gold-plated for corrosion resistance.
A sewing machine needle is a specialized needle for use in a sewing machine. A sewing machine needle consists of: [1] shank - clamped by the sewing machine's needle holder; shoulder - where the thick shank tapers down to the shaft; shaft - a length suitable for driving the eye and thread through the material and down to the bobbin; groove - cut ...
The upper thread runs from a spool kept on a spindle on top of or next to the machine, through a tension mechanism, through the take-up arm, and finally through the hole in the needle. Meanwhile, the lower thread is wound onto a bobbin , which is inserted into a case in the lower section of the machine below the material.
The weft thread is laid on the needles; The weft thread falls loosely; The needle bar draws back, the weft is pulled in the open needles; The needle bar draws back, the presser bar drops, the needle loops close and the weft is drawn back through the web; The needles open, a new row has been added to the web which drops under gravity
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