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A new way to get broken studs out....


JimAttrill
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You may all know about this but it was news to me....

We often get broken studs, especially TD5 exhaust manifold studs and rocker shaft bolts. These last are not easy to get out as they are 10.9 hardness.

So we bought a 6mm Left-Hand twist drill. (I didn't even know they made such a thing). Used in a reversible air drill it has successfully removed three broken studs in the last week without using stud extractors. Just whizzes the stud out of the hole.

Wasn't cheap though :blink:

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Of course you need a reversible drill, which seems to mean it has to be an air drill, so you need a compressor, etc. Unless you can get reversible electric drills? Apart from hammer drills we prefer the air-driven stuff anyway.

For the cost of the one 6mm LH drill bit we could have bought a complete set of 1-11mm drills! But it works so well we don't worry about the price. And being a workshop we will use it often. For a private owner it is an expensive option.

That drill set from Northern Tools is incredibly cheap compared to what we had to pay. As you say, quality is not really required, it just has to grab backwards.

You learn something new every day, and I have been in the engineering business since 1964 ha ha :)

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Most battery hand drills are reversible as they can be used for screw driving as well :)

As do a lot of mains powered drills these days. The Bosch I bought a couple of weeks ago is reversible (and a very nice drill - I think Screw Fix still have them on special offer for about £55).

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That drill set from Northern Tools is incredibly cheap compared to what we had to pay. As you say, quality is not really required, it just has to grab backwards.

You learn something new every day, and I have been in the engineering business since 1964 ha ha :)

I keep a set in my (electronics) toolbox for work. Lots of stainless M3 pozis that always get the heads chewed off by clumsy assemblers. Won't tell the clients where I got them though. As the old joke goes...$1 for the chalk mark, $19999 for knowing where to put it :lol:

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In a discussion with my colleague we came to the conclusion that removing broken studs is the only use for LH drills. Unless you need Left handed holes :)

Left-hand drills used in the repetition engineering industry on screw machines or drilling heads. Left-handed drills allow a machining operation to continue when the spindle either cannot be reversed or where the design of the machine makes it more efficient to run left-handed. With the increased use of the more versatile CNC machines their usage is less common than when specialised machines were required for machining tasks.

Also very good to give to Apprentice's :rofl:

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Hi Warthog, my mate and I agreed on the two reasons you put forward above. I don't know much about automatic lathes but did think that maybe they might sometimes need a left hand drill.

And as for fooling apprentices: "here sonny drill these 20 holes before lunchtime" :hysterical:

When I was apprentice I was sent for 'a long wait' at the stores. I came back 1 min before knocking off time. That taught 'em :)

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