7 ways to remove a broken tap
1. Weld an iron rod on the broken object and then unscrew it.
Disadvantages: a. Too small broken objects cannot be welded; b. Extremely high welding skills are required, and it is easy to burn out the workpiece; c. The welding is easy to break, and the probability of removing the broken objects is very small.
2. Tap with a cone-shaped tool that is harder than the broken object.
Disadvantages: a. It is only suitable for brittle cut-in objects, breaking the cut-in object and then slowly picking it out; b. The cut-in object is too deep and too small to be removed; c. It is easy to damage the original hole.
3. Make a hexagonal electrode with a diameter smaller than the diameter of the broken object. Use an EDM machine to machine a hexagonal countersink on the broken object, and then use an Allen wrench to unscrew it.
Disadvantages: a. It is useless for rusted or stuck broken objects; b. It is useless for large workpieces and cannot be placed in the EDM machine table; c. It is useless for too small broken objects; d. Time consuming and troublesome .
4. Use the electrode smaller than the broken object directly, and use the EDM machine.
Disadvantages: a. It is useless for large workpieces and cannot be placed on the table of EDM machine tools; b. It is time consuming; c. It is easy to deposit carbon when it is too deep and cannot be hit.
5, hit with 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.
6. Now there is a portable hand-held electric spark machine designed and manufactured based on the principle of electrical processing. It can easily remove broken screws and broken tap drill bits, which is a long time.
7, make a tool yourself, use three pins to insert the tap to remove debris, and of course this method can only be used for straight groove taps
