1, you can use a grinder to smooth the broken wire, then use a small drill first, and then gradually replace it with a larger drill, and the broken wire will gradually fall off. Tapping with the original size teeth after falling off has the advantage of not increasing the aperture.
2. Weld an iron bar on the broken object, and then screw it out.
3. Pry with a conical tool harder than the broken object.
4. Make a hexagonal electrode smaller than the diameter of the broken object, process a hexagonal counterbore on the broken object with an electric spark machine, and then screw it out with an Allen wrench.
5. Directly use an electrode smaller than the broken object, and use an electric spark machine.
6. Use alloy drill.
7. At present, there is a portable machine tool designed and manufactured based on the principle of electrical machining, which can take out broken screws and broken taps conveniently and quickly.
8. If the screw is not too hard, you can flatten the end face, then find the center point, punch a little bit with the sample, drill it with a smaller bit first, vertically, and then screw it out in the opposite direction with a wire breaker.
Extended data
History of screws:
The first person to describe the spiral was the Greek scientist Archimedes. Archimedean spiral is a huge spiral in a wooden cylinder, which is used to lift water from one floor to another and irrigate fields. Maybe he just described something that already exists. It may have been designed by craftsmen in ancient Egypt, using irrigation on both sides of the Nile.
In the Middle Ages, carpenters used wooden nails or metal nails to connect furniture with wooden buildings. /kloc-In the 6th century, nail makers began to produce nails with spiral lines, which can connect things more firmly. This is a small step from this nail to the screw.
Around A.D. 1550, the earliest metal nuts and bolts as fasteners appeared in Europe, all of which were made by hand on simple wooden lathe.
Screwdrivers (screwdrivers) appear around London 1780. Carpenters have found that tightening screws with a screwdriver can fix things better than beating them with a hammer, especially when fine-grained screws are involved.
1797, Maudslay invented the all-metal precision screw lathe in London. The following year, Wilkinson made a nut and bolt making machine in the United States. Both machines can produce universal nuts and bolts. Screws are very popular as fixing parts because a cheap production method has been found at that time.
1836, Henry M. Philips applied for the patent of cross slotted head screw, which marked the great progress of screw basic technology. Different from the traditional slotted head screw, the edge of slotted head screw. This design makes the screwdriver center automatically and is not easy to slide down, so it is very popular. ?
References:
Baidu encyclopedia-screw