There are 26 ways to take out the drill bit broken in the hole

Engaged in machining people know that the drill in drilling will always encounter so many times the drill bit break. especially CNC machine tools drilling. especially easy to break. and some or deep holes. which is a very headache. but do not be afraid. small workers for you to sort out 26 kinds of drill bit broken in the hole!

  • 1. Fill some lubricating oil. use a sharp pin or chopper to slowly knock out the broken surface in reverse. pouring iron sharpening from time to time (the most common method in the workshop. but it may not be suitable for threaded holes with too small apertures or broken taps that are too long. but you can try).
  • 2. Welding a handle or hexagonal nut on the broken section of the tap and then gently reversing it out (it would have been a good method. but welding is somewhat troublesome. or in the same words. it is not suitable for smaller diameter taps).
  • 3. With special tools: broken taps out. the principle is that the workpiece and taps are connected to positive and negative electrodes. the middle of the filling electrolyte. resulting in the workpiece to the taps discharge corrosion. and then auxiliary pointed pliers. etc. to remove the bore damage is very small
  • 4. Take the steel roller top in the tap crack with a small hammer slowly knock. tap is brittle. and finally knocked into slag out. or more simply. directly to the broken tap thread hole drilling bad live boring bad. re-expansion tapping (method some barbaric. if the tap diameter is too small is not good. the diameter is too large. knock up is also quite exhausting). 
  • 5. Weld the threaded hole where the broken tap is located. then grind it flat and re-drill it. although it is difficult but slowly can be drilled (if the threaded hole can be replaced. when re-drilling and tapping. it is recommended to replace it next to the original threaded hole).
  • 6. Chisel a slot in the broken tap cross-section and screw it up with a screwdriver in the opposite direction (the slot is very difficult to chisel out. and it is even more difficult if the tap diameter is small).
  • 7. The threaded hole of the broken tap drilled large. and then set a steel wire bush or pin or something. and then welding. grinding. re-drilling tapping. you can do basically the same (this method is troublesome. but very practical. the size of the tap does not matter).
  • 8. Beat off with electric impulses. EDM or wire cutting can be. hurt the hole can be reamed plus steel wire bush (this method is more simple and convenient. as for the coaxiality for the time being do not consider. unless your coaxiality of that threaded hole directly affects the quality of the equipment). 
  • 9. Make a simple tool while inserted into the broken cone section of the chip slot space. carefully reverse wrench out. such as. available with a square tenon on the broken cone screw 2 nuts. with a steel wire (the number of roots and the same number of taps slot) into the broken cone and the nut of the empty slot. and then use the reamer to wrench the square tenon in the direction of withdrawal. the broken cone out (the theme of this method is to contact the broken cone of the chip slot. the use of steel wire. preferably steel needle to make a wrench specifically to take the broken wire. (Of course. if the workshop is often the case of such broken wire. or make a wrench for such a tool is better). 
  • 10. Nitric acid solution can corrode high-speed steel taps. and do not scrap the workpiece.
  • 11. Use acetylene flame or torch to anneal the tap. then use the drill to drill. at this time the diameter of the drill should be smaller than the diameter of the bottom hole. drilling should also be aligned with the center to prevent the threads from drilling bad. after the hole is drilled into a flat or square punch and then use a wrench to spin out the tap
  • 12. Use a pneumatic drill to reverse the tap. all by hand. because it is not directly drilled off the tap. but with a slow speed and a little friction (similar to a car half-clutch) to let the tap turn out.
  • 14. You can use a grinding machine to break the part of the flat. and then use a small drill bit first. and then gradually switch to a larger drill bit. the broken wire will gradually fall off. after falling off with the original size of the tap re-tapping. the advantages of this can be done without increasing the hole diameter.
  • 15. Weld an iron bar on the broken-in object. and then screw out. (Disadvantages: a. too small break-in can not be welded; b. the welding skills required is very high. easy to burn the workpiece; c. the weld is easy to break. the chances of being able to remove the break-in is very small.)
  • 16. Pry with a cone-shaped tool that is harder than the break-in. (Disadvantages: a. only suitable for brittle break-in. will break into pieces. and then slowly pick out; b. break-in is too deep. too small can not be removed; c. easy to damage the original hole.)
  • 17. Make a hexagonal electrode smaller than the diameter of the broken-in object. use EDM to process a hexagonal sink hole in the broken-in object. and then use an Allen wrench to screw it out. (Disadvantages: a. Useless for rusted or stuck broken in; b. Useless for large workpiece; c. Useless for too small broken in; d. Time consuming and troublesome.)
  • 18. Directly use the electrode smaller than the break-in. and hit with EDM machine. (Disadvantages: a. useless for large workpiece. can not be put into the EDM machine table; b. time-consuming; c. too deep when easy to accumulate carbon. can not play down.)
  • 19. Fighting with alloy drill (disadvantages: a. easy to destroy the original hole; b. useless for hard break-in; c. the alloy drill is brittle and easy to break.)
  • 20. There is now a portable tool machine designed and manufactured with the principle of electrical processing. can easily and quickly remove the broken screws. broken taps drill bit.
  • 21. If the screw is not too hard. you can frustrate the end face. and then find out to find the center point. with a kind of punch to hit a small point up. with a smaller drill bit first. to vertical. and then use the broken wire out of the reverse screw can be.
  • 22. If you can not buy a broken wire out of the device. use a larger drill to continue to expand the hole. in the hole diameter close to the screw. some of the wire will not be able to eat the strength to fall off. remove the remaining wire teeth. and then use the tap to re-trim it.
  • 23. If the screw broken wire has been exposed. or broken screw at the requirements are not strict. there is a hand saw can be sawed. you can saw a slit. even the shell also sawed. and then removed with a flat screwdriver.
  • 24. If the broken wire to reveal a certain length outside. and mechanical materials and not too low melting point. available welding in the screw above the welding of a lengthened T-bar. so that it can be easily screwed out from the welded rod.
  • 25. If the screw rust is very serious. with the above method is not good to deal with. it is recommended that the fire baked red after adding a little lubricant. and then the above corresponding way to deal with.
  • 26. After more efforts. although the screw is taken out. but then the hole is also ruined. simply drill a larger hole tapping. if the original screw location and size restrictions. you can also play a larger screw into. or directly welded tapping. and then drill a small hole in the center of the large screw tapping. But after welding the internal metal structure problems sometimes tapping will be more difficult.


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