How to unscrew a piece of the studs with an extractor
Removing the hairpin debris extractors
From the theory we turn to practice. I have no specially broken and stuck thread, but I will do a complete imitation in order to visually show the whole process. I have prepared a thick-walled profile with holes that are threaded. I prepared bolts for these holes.
I take these bolts, hammer off the thread and wrap it with a wrench with a force in profile. Everything is very tight and you cannot tell me that this is not a gram of real conditions.
I cut the heads flush with a grinder.
The first thing to do is to drill a hole exactly in the middle. To do this, we take the core and core point,so that the drill does not jump at the beginning of drilling.
Point of pitting.
Now you need to drill a hole, the diameter of which should be approximately equal to half the thickness of the bolt. In this case, the bolt M16, the thread diameter is 16 mm. We take a drill in half and drill a hole with a diameter of about 8 mm.
It turned out quite exactly in the center.
Insert the appropriate extractor and start rotating to the left. To turn the extractor, they use the knob, but if it isn’t there, the adjustable wrench is quite suitable.
As soon as the extractor produces a hook, the thread fragment itself will turn out.
I hope it is clear. Now go to a larger bolt.Everything is exactly the same: we drill a hole in the center.
Insert the extractor and unscrew it to the left.
To free a tool, grip the chip in a vice or in manual clamps. And turn the key to the right side relative to the piece of thread. Turning everything is pretty simple.
This is a simple and worked out method for years.
I want to add that you should not drill a hole of too large a diameter with respect to the thread, since thin walls in the stud will flare the thread itself, which will adversely affect unscrewing. br>Particularly care should be taken with small diameter extractors, as they often break. If the chip does not want to give in, heat the knot and drip it with lubricant.