Mechanical design manual screw 2

The thread processing
A lot of thread processing method, the general use of the following methods
1, lathe processing
2, special tool processing: tap, die
This method can be used in the drilling process, can also be processed manually in the assembly site.
3, rolling thread.
Tooth type threads
In the screw axis plane, profile shape of thread
Triangular, trapezoidal, serrated.
The diameter of the thread.
The diameter of the thread with diameter of large diameter, diameter and thread, respectively
The symbols D, D1 and D2; and the internal thread using the D, D1 and D2.