A broken bolt head can sometimes cause a huge number of problems for any car enthusiast or owner of another type of vehicle. As a result of exposure to corrosive media and the occurrence of metal fatigue, the bolt breaks inside the thread under the influence of shock loading or when loosening. Fortunately, so-called extractors can be used to retrieve a broken bolt.
Necessary
- - drill;
- - set of drills;
- - extractors;
- - die for taps;
- - good core.
Instructions
Step 1
In order to work with an extractor, you need to understand how it works. The meaning of the device is that a hole is made in the broken bolt, the diameter of which should not exceed the diameter of the thread of the broken bolt. The extractor itself is screwed into this hole, which has a reverse thread. When threading a reverse thread into the body of a broken bolt, you are simultaneously unscrewing its broken body.
Step 2
If the bolt breaks where you can easily get to it, then the first step is to level the surface of the remaining bolt. You can use a file for this.
Step 3
Further, the surface must be punched very well. Without a good and high-quality imprint of the core, the drill will constantly fidget over the remainder of the bolt and it will not work to drill a hole in the end in the center. In the meantime, it is very important to maintain alignment and the hole should be placed as close to the center of the bolt as possible.
Step 4
You need to start drilling with a small diameter drill. The main thing at the initial stage is to correctly place the hole. Accordingly, it is always easy to expand the centered hole. The hole should have a diameter 1 mm smaller than the diameter of the extractor. The hole does not need to be made through, otherwise the extractor will have nothing to catch on.
Step 5
After the formation of a hole in the surface of the bolt, the extractor itself must be screwed in there. Take an extractor, install it in the hole and hit with a hammer, trying to drive into the hole like a nail. After the impact, the extractor itself should be stuck in the hole. Now clamp the head with a die and rotate in the direction of unscrewing the bolt body. Rotate the die slowly and carefully. The extractor will cut into the bolt body, reach its maximum tightening and will transmit torque to the broken bolt. This torque will unscrew the broken bolt.
