Blog

high precision cheap price Professional OEM Custom CNC machine suppliers

Anyone who is engaged in machining knows that there will always be several tap breaks when tapping threads, especially in the CNC machining process, which is particularly easy to break, and some are still deep holes, which is very troublesome. things, so today we have compiled 25 ways to remove broken taps for you! high precision cheap price Professional OEM Custom CNC machine suppliers

1. Pour some lubricating oil, use a sharp hairpin or chopper to knock out slowly on the broken surface in reverse, and pour iron filings from time to time (the most common method in the workshop, but it is too small for threaded holes or broken taps that are too small in diameter. Long may not be suitable, but you can try).
2. Weld a handle or hexagonal nut on the broken section of the tap, and then gently reverse it (it is a good method, but welding is a little troublesome, or the same, it is not suitable for taps with smaller diameters).
3. Use a special tool: a broken tap extractor. The principle is that the workpiece and the tap are connected to the positive and negative electrodes respectively, and the electrolyte is poured in the middle, which causes the workpiece to discharge and corrode the tap, and then assist the needle-nose pliers to remove it, which will cause little damage to the inner hole.
4. Use a small hammer to tap the top of the steel roller on the crack of the tap slowly, the tap is relatively brittle, and finally knock it into slag. Some are savage, if the diameter of the tap is too small, it is not easy to use, and if the diameter is too large, it is very tiring to tap).
5. Weld the threaded hole where the broken tap is located, then grind it flat, and re-drill it. Although it is difficult, it can be drilled slowly (if the threaded hole can be changed, it is recommended to replace it when re-drilling and tapping). next to the original threaded hole).
6. Chisel a slot on the section of the broken tap, and screw it up with a screwdriver in reverse (that slot is difficult to chisel out, and it is even more difficult if the diameter of the tap is small).
7. Drill the threaded hole of the broken tap to a larger size, then insert a wire screw sleeve or pin or something, then weld, grind it flat, and re-drill and tap, which can be basically the same (although this method is troublesome, but very practical , the tap size does not matter). high precision cheap price Professional OEM Custom CNC machine suppliers
8. Destroy it with electric pulse, EDM or wire cutting. If the hole is damaged, you can ream the hole and add a wire screw sleeve (this method is simpler and more convenient, don’t consider the coaxiality for the time being, unless your threaded hole is the same Axiality directly affects the quality of the device).
9. Make a simple tool and insert it into the vacancy of the chip removal groove of the broken tap section at the same time, carefully pull it out in reverse, screw 2 nuts on the broken tap with square tenon, and insert it with steel wires (the number of which is the same as the number of tap grooves) In the empty groove of the broken tap and the nut, then use the hinge rod to pull the square tenon in the withdrawal direction to take out the broken tap (the main idea of ​​this method is to connect the chip groove of the broken tap, using steel wire, preferably steel needle Make a wrench specially designed to remove broken wires. Of course, if such broken wires often occur in the workshop, it is better to make such a tool wrench).
10. The nitric acid solution can corrode the high-speed steel tap without scrapping the workpiece.
11. Anneal the tap with an acetylene flame or a blowtorch, and then drill it with a drill. At this time, the diameter of the drill should be smaller than the diameter of the bottom hole, and the drill should be aligned with the center to prevent the thread from being drilled. After the hole is drilled, a flat shape is inserted. Or use a square punch to unscrew the tap with a wrench.

12 Use an air drill to reverse the extraction, which depends entirely on the feel, because the tap is not drilled directly, but is rotated at a slow speed and a little friction (similar to a car half-clutch).

13. You can use a grinder to smooth the broken wire, then use a small drill bit to drill first, and then gradually switch to a larger drill bit, the broken wire will gradually fall off, and then tap the tooth again with a tap of the original size. The advantage is that there is no need to increase the aperture.
14. Weld an iron rod on the break-in and unscrew it. (Disadvantages: a. Too small broken objects cannot be welded; b. It requires extremely high welding skills, and it is easy to burn the workpiece; c. The welding place is easy to break, and the probability of being able to take out the broken objects is very small.)
15. Pry with a tapered tool that is harder than the broken object. (Disadvantages: a. Only suitable for brittle broken objects, break the broken objects into pieces, and then slowly remove them; b. The broken objects are too deep and too small to be taken out; c. It is easy to damage the original holes.) high precision cheap price Professional OEM Custom CNC machine suppliers
16. Make a hexagonal electrode smaller than the diameter of the broken object, use an EDM machine to machine a hexagonal counterbore on the broken object, and then use an Allen wrench to unscrew it. (Disadvantages: a. Useless for rusted or stuck cut-ins; b. Useless for large workpieces; c. Useless for too small cut-ins; d. Time-consuming and troublesome.)
17. Directly use an electrode smaller than the broken object, and hit with an EDM machine. (Disadvantages: a. It is useless for large workpieces and cannot be placed on the EDM machine table; b. It is time-consuming; c. It is easy to deposit carbon when it is too deep and cannot be played.)
18. Use an alloy drill (disadvantages: a. It is easy to damage the original hole; b. It is useless for hard broken objects; c. The alloy drill is brittle and easy to break.)
19. Now there is a portable power tool designed and manufactured by the principle of electric machining, which can easily and quickly take out the broken screw and broken tap drill bit.
20. If the screw is not too hard, you can file the end face, and then find the center point, punch a small point with the sample punch, drill first with a smaller drill bit, make it vertical, and then use the broken wire extractor to twist it in reverse. out.
21. If you can’t buy a broken wire extractor, use a larger drill bit to continue reaming. When the hole diameter is close to the screw, some of the wire will fall off unbearably. Remove the remaining wire teeth, and then use a tap to trim it again. high precision cheap price Professional OEM Custom CNC machine suppliers
22. If the broken wire of the screw is exposed, or the requirements for the broken screw are not strict, it can also be sawed with a hand saw, and the slits can be sawed, and even the casing can be sawed, and then removed with a flat-blade screwdriver.
23. If the broken wire is exposed to the outside for a certain length, and the melting point of the mechanical material is not too low, an extended T-shaped rod can be welded on the screw by electric welding, so that it can be easily unscrewed from the welded rod.
24. If the rust of the screw is very serious, it is not easy to deal with the above method. It is recommended to bake it with fire and add a little lubricating oil, and then use the above corresponding method to deal with it.
25. After a lot of hard work, although the screw was taken out, the hole was useless at this time, so I simply drilled a larger hole for tapping. If the original screw position and size are limited, you can also drill a larger screw. Screw in, or directly weld the tapping, and then drill a small hole in the center of the large screw to tap. However, the internal metal structure problem after welding is sometimes difficult to tap. high precision cheap price Professional OEM Custom CNC machine suppliers

For more information about this article and how we can help with your project, please contact us today.

CNC Machining Service & CNC Machining partsCNC Machining Experts serving Global Industries. Deliver perfect parts, on time, at affordable prices. Armed with the industry-leading technology and techniques. All samples are free！China’s largest manufacturing companies. Precise component manufacture ltd. Rapid prototype machining, rapid prototype parts.