How to cut the thread on the pipe

In many houses, the heating system and water supply are still implemented using metal pipes, which delivers a lot of inconvenience when redeveloping the network, most importantly of which is the need for a threaded compound with a metal pipe. The carving on the metal tube is required if you want to make the transition from metal on plastic or metal plastic if you have to trim the tee, lengthen the pipe, etc.

There are several characteristics of the thread, the knowledge of which is necessary so that after cutting the thread, it is reliably, and the main thing is hermetically coincided with carvings on the finished product (adapter, tee, coupling):

thread Type: Internal or Outdoor;
the thread step is the distance between the turns;
thread depth;
diameter.

To cut the threads will need the following devices:

for external thread - a plaster, a draft for a draft thread, a cry for finishing thread;
for internal thread - sweaters, tap for rough thread, tap for finishing;
lubricant (solidol, machine oil, vegetable oil, fat);
bulgarian or file.

You can use one shock and the tread, but the use of different devices for roughing and finishing thread has some advantages:

the complexity of the process is reduced;
decreases wear of fixtures.

The order of cutting outward threads:

perform an external preparatory slice, the so-called chamfer, throughout the circumference at the end of the pipe where you will cut the thread;
treat the lubricant space of the future thread, as well as a dust teeth;
press the plate with a draft for a rough thread to the pipe and rotate at least 5 revolutions clockwise;
if in the process of cutting there will be great resistance, make the floor turn back, then continue cutting;
after cutting a rough thread, replace the cry in the plasters-container on the finishing and screw the finishing plate on the already cutting thread.

The sequence of cutting internal thread differs from cutting external so that it is necessary to perform a cut on the inside of the pipe before cutting the thread, as well as using taps instead of the dies.

An alternative to metal pipes - plastic products and metalplastic, which were obtained very large distribution due to their small weight, easy to install and less cost due to the fact that there is a cheap plastic, not a metal.