Advice 1: How to restore the thread

Damage to the internal threaded part in the hole is the result of a strong tightening or using a bolt "not threaded". Its restoration can be accomplished in various ways.
How to restore the thread
You will need
  • - epoxy adhesive;
  • - tap;
  • and tapping oil;
  • - threaded wertish;
  • Kern.
Instruction
1
Select the how to restore a thread, depending on the operating conditions of the structure. You can restore it, using epoxy glue.
2
Fill in the epoxy glue in the hole and wait for a while until it slightly hardens. Replace the bolt and wait for complete drying of the polymer. You must know that this method of restoring the thread is not suitable for parts that perceive high loads and vibration, as well as components and structures in high temperatures.
3
In another method, first drilled the damaged hole using the HSS high tensile strength. Cut the threads with a tap of the desired size, using special thread-cutting oil.
4
Oil the cutting edges of the tool in the process of cuttingto shavings sticking to it and not fell into the hole. If cutting is done with effort, rinse the tap with kerosene and put some oil on its edges. In this method of recovery threads, the hole will get larger.
5
If you increase the diameter of the hole is impossible, restore it to the thread using wertish. He is a hollow cylindrical fixture having inside and outside sliced the thread size and step.
6
Drill a hole with a drill bit. Choose the tap that corresponds to the outer diameter of virtusa, and cut the thread. Install in hole wertish. Cut if necessary, it exposed the upper part. Apply with Kern ticks on the border of the new thread and wertish so he wouldn't get out of the hole.
7
If possible, zaplovite hole with damaged threads, using welding. Then drill in the same place new desired diameter. It cut the threads using a tap wrench. This method of recovery is considered the most reliable. A new hole can also be made adjacent to old, permitting the construction details.

Advice 2: How to measure the thread

In the manufacture of designs that use threaded connections, often have to pick up bolts and nuts so that the thread matched its parameters. For measuring the thread there are special devices.
How to measure the thread
You will need
  • Thread templates, thread gauges, thread micrometer
Instruction
1
To measure, use a special threaded pattern. It is a set of plates that bear teeth; thread pitch corresponding to the specific pattern marked on the plane of the plate. A set of templates with different step is sealed in the cassette. By means of a threaded template, you can only measure the value of the thread pitch, the deviation does not measure it. To determine the thread pitch for a particular product, attach the template to the thread, selecting one that will exactly match her.
2
For a comprehensive evaluation of the correct execution of the thread for details use thread gauges. Such calibers exist to control both external and internal threads. Before use, check the caliber of the part clean of chips and dirt. With the caliber must be handled carefully, preventing the threaded surface scratches.
3
When measuring threads of the outer and inner diameters, use a screw micrometer. The micrometer has a spindle and heel holes in which are mounted sets of interchangeable inserts. Inserts correspond to measured elements of the thread and its size. Secure the micrometer in a stand, set on the template or standard thread. The measurement error is 1 mm.

Advice 3: How to wind linen thread

In order to achieve the strength and tightness of the connection, builders and plumbers use in their work of len or special flax tow which is wound on the threads of the butt of items. To really achieve the desired results, it is important to know how to wind the flax to thread correctly.
How to wind linen thread
You will need
  • - tow (len);
  • - silicone;
  • - plumbing key.
Instruction
1
Prepare the connecting elements, pre-cleaning them of rust, when suddenly this is available. For this you can use sandpaper medium grain. Removing the rust, be careful not to damage the threads.
2
Take the tow and separate from the main beam a small strip of fibers, which spread along the entire length. Fiber should be enough to get the connection turned out dense, but not tight, otherwise when the temperature rises, for example, in the pipe.lenia, the connection may just burst. Besides, the excess will be len givinglen of threaded connections during Assembly, and it almost certainly will cause new leaks.
3
Please note that the piping with the cut thread die stock, usually have a sufficiently rough surface, but the fittings with a smooth surface should be prepared. With plumbing key or triangular needle file, apply a small notch on top of the thread.
4
Take len, and attach the end of the fiber to the edge of the thread. Start to wind the tow in a reverse directionlinenAI from tightening the nut. Wound should be so that each subsequent round tightly pressed the previous. If the flax was not enough to cover the whole thread, take another beam.
5
On top of the fiber which is wound on the threads, apply a thin layer of silicone or special paste: this will allow you to achieve the tightness of the connection.
6
Twist the threaduntil the silicone has not yet polimerservice. Remember, before the end of this chemical reaction is 8-10 minutes. To cement the small amount of waste, which will remain outside the compound, no sealant will be good to keep linen. However, plumbing, working with metal pipes, sometimes just off the end of the beam. Doing it at home is not recommended.
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