1. Pour some lubricating oil, use a sharp chopper to knock out slowly on the fracture surface in reverse, and pour iron filings from time to time. This is a more common method in the workshop, but it may not be suitable for threaded holes with too small diameters or broken taps that are too long, but you can have a try.
2. Weld a handle or hex nut on the broken section of the tap, and then gently reverse it. This method of welding is a bit troublesome, or the same, it is not suitable for taps with smaller diameters.
3. Use special tools: broken tap extractor. The principle is that the workpiece and the tap are respectively connected to the positive and negative electrodes, and the electrolyte is filled in the middle, which causes the workpiece to discharge and corrode the tap, and then assists the needle-nose pliers to take out, which will cause less damage to the inner hole.
4. It can be destroyed by electric pulse, electric spark or wire cutting. If the hole is damaged, it can be reamed and screwed with steel wire. This method is simpler and more convenient. Don't consider the coaxiality for the time being, unless the coaxiality of your threaded hole directly affects the quality of the device.
5. Make a simple tool and insert it into the chip removal groove of the broken tap section at the same time, and carefully pull it out in reverse.
6. The nitric acid solution can corrode the high-speed steel tap without scrapping the workpiece.
7. The nitric acid solution can corrode the high-speed steel tap without scrapping the workpiece.
8. If you can't buy a broken wire extractor, use a larger drill bit to continue to ream the hole. When the hole diameter is close to the screw, some of the wire will not be able to bear the force and fall off. Remove the remaining wire teeth, and then use a tap to trim it again.
9. If the broken wire of the screw is exposed, or the requirements for the broken screw are not strict, it can be cut with a hand saw.
10. After a lot of hard work, although the screw was taken out, the hole was also useless at this time, so I simply drilled a larger hole and tapped it. If the original screw position and size are limited, a larger screw can be inserted , or directly weld the tapping, and then drill a small hole in the center of the large screw for tapping.
Post time: Mar-30-2022