How to Remove a Broken Tap

How to remove a broken tap quickly.

Electro Arc’s small EDM Tap removal tool is featured below. No dielectric fluid required. It is economical and convenient. Our metal disintegrators remove broken taps and drills without damage or coming into contact with the part. An Arcer Head can be used with other machine tools like this drill press.

What is a tap extractor?

A tap extractor is known by many names including an  EDM machine, tap burner, metal disintegrator, and spark eroder. These metal disintegration machines are used to remove broken bolts, taps, and drills without doing any damage to the surrounding part. Cheap systems often make the situation worse or are not even necessary. With an electric discharge machine (EDM) you get the precision, speed, and value without the cost of replacing parts on expensive equipment.

Broken tap removal service

When working with broken taps it is important to remember that the center part is solid. What this means is that the part can be broken and essentially removed. Taps with a thread size smaller than M12 should be removed by breaking the center. There are cases that the tap can have a very large thread. If this is the case it may be better to divide it into halves in order to remove them. The electrode does not have to be applied to the largest depth. When it reaches the desired depth just turn up the arcer head and begin to remove the debris. You can then continue the process of disintegration with your electrode. The power of a metal disintegrator is established by creating a series of electric arcs or disharges that erode the broken metals into smaller particles.

This produces sparks that move between the broekn piece and the electrode cutting through the broken machine part.  A puddle is created by the spark (also known as the hot plasma) as a result of the workpiece being melted by the electrical discharge produced by the electrode. The small amount of dielectric is vaporised which creates bubbles around the spark.

It is important to keep the work area clean. A slower removal rate increases the rate of tear which is related to the rate of removal. The head is located in the flush area which helps to speed up the time for metal removal. The result of the removal also affects the size of the spark. Big and long sparks lead to a bigger depth and a rougher surface. For a finer finish, smaller sparks, a higher wear rate and low removal rate are required. There are copper alloys that have been designed to maximise the process of spark eroding and offer better wear resistance and improved machinability.

More inforamtion can be found here:

Spark Erosion Explained


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How to Remove a Broken Tap

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