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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").
A spring pin (also called tension pin or roll pin) is a mechanical fastener that secures the position of two or more parts of a machine relative to each other. Spring pins have a body diameter which is larger than the diameter of the hole they are intended for, and a chamfer on either one or both ends to facilitate starting the pin into the hole.
Pinking shears are used for cutting woven cloth. Cloth edges that are unfinished will easily fray, the weave becoming undone and threads pulling out easily. The sawtooth pattern does not prevent the fraying but limits the length of the frayed thread and thus minimizes damage. [8]
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 ...
Die shoes (holders) – the set of flat, parallel plates that serve as the foundation for mounting die components. [4] Guide pins (pillars) – together with guide bushings, the pins align the die shoes precisely during each press stroke. [4] Die set (plates). [5] Placement can be inverted depending on the operation, such as use of a knock-out: [6]
The tips of roll pin punches are not flat and should never be used on regular solid pins. If a roll pin punch is used on a solid pin, it will mar or mark the pin. If the end of a roll pin punch is damaged or deformed, it should be discarded. It is virtually impossible to regrind the tip of the roll pin punch and properly shape the center ...
Self-tapping screws can be divided into two classes: [3] those that displace material (especially plastic and thin metal sheets) without removing it, known as "thread-forming" self-tapping screws, and self-tappers with sharp cutting surfaces that remove the material as they are inserted, termed "thread-cutting" self-tapping screws.
These pins have a head bent into a capital letter "T" to make it easier to grab with the finger tips. Dressmaker pins: 17-20: 1 + 1 ⁄ 16 in (27 mm) The most common type of sewing pin, they are used for light- to medium-weight fabrics and may have either a small flat head or a round plastic one. Pleating pins: 17: 1 + 1 ⁄ 16 in (27 mm)