TAP, drill broken in the hole 25 ways to get it done!

The TAP and drill bit are broken in the hole. How to fix it? Check out these 25 tips!

1. Pour some lubricating oil into the fracture surface and slowly knock out the fracture surface with a sharp hairpin or a cleaver, reverse turning from time to time (the most common method in the shop, but may not be suitable for threaded holes of too small size or for taps that are broken too long, but can be tried) .

2. Weld a handle or hex nut on the broken cross-section of the TAP and gently reverse it (this is a good idea, but the welding is tricky, again, not for smaller taps) ;

3. Using special tool: broken tap take-out device. The principle is that the work piece and tap are connected with positive and negative electrodes respectively, and electrolyte is poured in the middle,

causes the workpiece to the tap discharge corrosion, and then assists the needle nose pliers and so on to take out, to the inner hole damage is very small;

4. Take the steel roller top in the tap crack slowly knock with a small hammer, tap is more brittle, and finally knock into slag out, or more simply, directly break the tap of the thread hole boring boring live rotten, reaming tapping (the method is a bit barbaric, if the tap diameter is too small also do not work, diameter is too big, knock up also quite tired) ;

5. The thread hole where the broken tap is welded flat, re-grinding, re-drilling, although it is difficult but slowly can be drilled in (if the thread hole can be changed position, re-drilling tapping, or recommended to the original thread next to the hole) ;

6. Cut A groove in the cross section of the tap and reverse-screw with a screwdriver (the groove is difficult to cut out, especially if the TAP is small in diameter) ;

Kill. Drill the hole of the broken tap big, then insert a steel screw sleeve or pin, then weld, smooth, re-drill tapping, can do basically the same (although this method is troublesome, but very practical, tap size does not matter) ;

8. Use Electric Pulse, electric spark or wire cutting can be broken hole can be reaming plus steel screw sleeve (this method is more simple and convenient, as for coaxiality temporarily do not consider, unless you that screw hole coaxiality directly affect the quality of equipment) ;

9. Make a simple tool and insert it into the void of the chip discharge groove of the broken tap section. Carefully reverse the wrench. For example, two nuts can be screwed on the broken tap with a square tenon, insert the steel wire (equal to the number of taps) into the empty slots of the broken taps and nuts, and then pull the square tenon in the exit direction with the hinge bar, take out the broken tap (the theme of this method is to open and tie off the broken tap of the chip slot, the use of steel wire, it is best to do a steel needle to make a special wrench to take off the broken wire. Of course, if the workshop often occur in the case of broken wire, or make a wrench such a tool better) ;

10. Nitric acid solution can corrode the high-speed steel tap, and does not scrap the workpiece;

Kill. Anneal the tap with an acetylene flame or a torch, then drill with a drill bit, which should be smaller than the diameter of the bottom hole and should be centered so as to avoid damaging the thread, after the hole is drilled, insert a flat or square punch and screw out the tap with a wrench

12. Using air drill reverse take, all depends on feel, because not directly drill off the TAP, but with slow speed and a little bit of friction (similar to car semi-clutch) let the TAP followed out;

13. Grinding wheel can be used to smooth the part of broken wire, and then drill with a small bit first, and then gradually use a larger bit, broken wire gradually fall off, fall off and then use the original size of the tap to re-attack the tooth, such advantages can not increase the aperture;

14. An Iron Bar is welded on the broken object and then screwed out. (disadvantages: too small break-in can not be welded; extremely demanding welding skills, easy to burn the workpiece; welding site is easy to break, can take out the break of the probability is very small)

15. Pry with a tapered tool that is harder than the break. (disadvantages: only suitable for brittle broken objects, broken objects, and then slowly out; broken objects too deep, too small to take out; easy to destroy the original hole)

16. To make a hexagonal electrode smaller than the diameter of the broken object, a hexagonal sink hole is made on the broken object by an electric spark machine, and then the hexagonal wrench is used to screw out. (disadvantages: Useless for rusted or stuck broken parts; useless for large parts; useless for too small broken parts; time-consuming and laborious)

Kill. Directly use the electrode smaller than the broken object, hit with the electric spark machine. DISADVANTAGES: useless for large workpieces, can not be placed in the EDM table; time-consuming; too deep, easy to carbon deposition, can not fight

Kill. Hit with an alloy bit (disadvantage: Easy to destroy the original hole; useless for hard broken objects; alloy bit is more Brittle to break)

Kill. Now there is a portable tool machine designed and manufactured by the principle of electric machining, which can easily and quickly take out the broken screw and the broken tap bit.

20. If the screw is not too hard, you can find out the center point, punch a small point with a small bit drill, to vertical, and then use the broken wire take-out reverse screw can be.

21. If you can not buy a broken wire extractor, use a larger drill to continue to expand the hole, in the hole diameter close to the screw, some of the wire will be unable to resist falling off, remove the remaining teeth, and then use the tap to repair the line.

22. If the screw is broken, or the place where the screw is broken is not strict, there is a hand saw can be sawed, you can saw the seam, even the shell, and then with a flat screwdriver removed.

23. If the broken wire exposed a certain length in the outside, and the mechanical material melting point is not too low, you can use welding in the screw above welding a lengthened t pole, so that from the welding pole easily screwed out.

24. If the screw rust is very serious, with the above method is not easy to deal with, it is recommended to use fire red add a little lubricating oil, and then deal with the corresponding way.

25. After many efforts, the screw is removed, but at this time the hole is also useless, simply drill a larger hole tapping, if the original position and size of the screw is limited, you can also play a larger screw into, or direct welding die tapping, then drill a small hole in the center of the large screw. But tapping can sometimes be difficult due to structural problems inside the weld.