A threading or thread is a surface whose axis is contained in the plane and around it describes a cylindrical helical trajectory.1 Threading can be carried out with hand tools or machine tools such as drilling machines, milling machines and lathes. Taps and dies are used for manual threading, which are cutting tools used to create the threads of bolts and nuts in metals, wood and plastic. The male is used to thread the female part while the tap is used to thread the male portion of the mating pair. The tap can also be used for machine threading. If you need to produce large quantities of both male and female threads, roll threading is used depending on the material with which it is constructed.
Manual threading can be done by means of a tap or a tap. The tap is a cutting tool with which threads are made in the internal part of holes, generally in a metal or plastic part.
For its part, the tapping die is a manual cutting tool used for manual threading of bolts and screws.
Both tools must have a specific diameter and thread pitch established by some thread system. The process of threading by hand is carried out by applying three taps in succession. The first male has a long conical entrance and lacks teeth.
It is used to start and guide the thread. The next one is used to rough the thread and the last one finishes and calibrates the thread. It can also be used as a machine tap.
Manual threading is used in industrial and mechanical maintenance for reworking threads, in electrical installations and assemblies, etc. The industrial or series threading is carried out instead with machine taps. There are four main types: male with straight channel, male with right hand helical channel, and male with left hand helical channel and right cut.
The latter is used to tap holes with an interrupted cut (for example: longitudinal keyways, transverse holes). The chip goes in the direction of the advance of the male avoiding being trapped between the walls of the hole and the teeth of the male.
Finally, the straight tap with corrected entry is used in through holes. The chip is driven forward.
There is a tap for each type of standard screw according to the current thread systems. The dies can be hand-operated or mounted on a die holder or bander arm, which makes it easy to apply force and twist to form the desired thread.
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