Much as it might sound like it, no, I am actually being serious,
I have a set of drills that cut when spun in the anticlockwise
direction. They are particularly good for drilling stuck fasteners,
since the heat generated by the drilling combined with the direction of
rotation will often spin out the stuck fastener. If they don't, then you
still have a hole ready to try a stud extractor in.
(although if you snap off the hardened stud extractor, you are still in
the same world of hurt!)
O'Hare Approach Control to a 747: "United 329 heavy, your traffic is a Fokker, one o'clock, three miles, Eastbound."
United 239: "Approach, I've always wanted to say this... I've got the little Fokker in sight."
I was thinking mainly that the LH drills are rarer & (I assume) more
expensive than normal ones. Of course if you have 3 stuck screws to
get out, the drill is going to break on the first or second screw, &
the neighbourhood pet food & DIY store won't stock those drills.
Contrary to others' experience it seems, I once used successfully one in my
youth to remove a cylinder head stud on my motorbike. Decades ago now, so I
can't recall the circumstances; notably what had originally happened to the
stud; however I can certainly remember the tangible relief when I got it
The only things I've used before are these stupid things, which are supposed to self tap. They don't. They take ages to get anywhere and just tear the top part of the screw to pieces:
Men wake up as good-looking as they went to bed.
Women somehow deteriorate during the night.
I have had some success with a similar product but maybe it depends on
how seized they are. One point though the extractors are strong but
brittle and there is a danger of snapping one while trying to extract.
Then you will have days of fun trying to drill out the extractor.
That is an inevitable by product of making them stronger
that what you are extracting so they dig into what you are
extracting so you can get what you are extracting out.
They are, but more brittle too. In other words
they can break rather than just deform. You
don't want them to deform, you want them
to not deform so they deform what you have
screwed them into that you want to extract.
On Friday, 1 April 2016 00:43:48 UTC+2, Mr Macaw wrote:
Lots and LOTS of money. Trading off strength against toughness is easy -
adding both is really expensive (and if it were cheap, the screws you are
trying to extract would be made stronger *and* tougher - so you would be
back where you started).
See "The New Science of Strong Materials" for an easy-to-read introduction
to the problem.
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