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The process of cutting or forming threads using a tap is called tapping, whereas the process using a die is called threading. Both tools can be used to clean up a thread, which is called chasing. However, using an ordinary tap or die to clean threads generally removes some material, which results in looser, weaker threads.
A diagram of a solid single-form thread cutting tool A solid multiple-form thread milling cutter The path a multiple-form thread cutting tool travels to create an external thread. Threads may be milled with a rotating milling cutter if the correct helical toolpath can be arranged. This was formerly arranged mechanically, and it was suitable for ...
This type of collet holds the external surface of the tool or workpiece being clamped. This is the most usual type of collet chuck. An external collet clamps against the internal surface or bore of a hollow cylinder. The collet's taper is internal and the collet expands when a corresponding taper is drawn or forced into the collet's internal taper.
A die head is a threading die that is used in the high volume production of threaded fasteners. Die heads are commonly used on lathes, turret lathes, screw machines and CNC lathes. They may be used for either cutting a thread or rolling a thread. They may also be used for internal or external thread cutting.
A W-type external-thread collet (red) being pulled into its spindle seat (green) with a drawbar (blue), clamping and then releasing a shaft. A drawbar or spindle drawbar is a clamping mechanism for toolholders on machine tools.
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.
Turning is a machining process in which a cutting tool, typically a non-rotary tool bit, describes a helix toolpath by moving more or less linearly while the workpiece rotates. Usually the term "turning" is reserved for the generation of external surfaces by this cutting action, whereas this same essential cutting action when applied to ...
Parting: The tool is fed radially into the workpiece to cut off the end of a part. Threading: A tool is fed along and across the outside or inside surface of rotating parts to produce external or internal threads. Boring: A single-point tool is fed linearly and parallel to the axis of rotation to create a round hole.
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