Date: 14 Jun 2005 16:26:24 GMT From: Dave Hinz <DaveHinznospamcop.net> Subject: Re: Extracting Recessed Bolt (Broken, Too!)
On Tue, 14 Jun 2005 17:02:58 +0100, John Hudson <mypcnospam.com> wrote: > > "Dave Hinz" <DaveHinznospamcop.net> wrote in message > news:3h88hmFfli08U1nospamvidual.net... >> >> First, drill with >> the left hand drill bit, of a diameter of the appropriate easy-out tool >> for the fastener you're trying to remove. If you're lucky, the heat, >> torque, and kroil that you've put on to soak will act together and it'll >> come out. If you're less lucky, then you can use the ez-out which is >> kind of a left-twist, tapered corkscrew kind of a deal. > Dave I do not understand your reference to a left handed drill bit. You use > a normal twist drill of the correct size and then a special bit for the > removal of the screw. Well, sure, you can use a normal drill bit if you don't have a set of the left-twist ones, but what I'm saying is that sometimes just using the left-twist drill bit will be enough that you don't have to move on to step 2, with the ez-out. > These bits had the trade name of Ezy Outs in the UK > many years ago. The proper name is Screw Extractors. Once in the hole in the > broken screw you turn them anti clockwise and they lock into the screw and > out it comes. If you're lucky. > In the real world that does not happen. This thread (thats > clever!) reminds me of some of the struggles I've had and thinking about it > makes me wonder if such a thing was ever made for LH threads, I rather think > not. Of course removiing broken taps is the hard one especially if its in > tool steel. Yes. Whatever caused the bolt or tap to stick in the hole, is still holding it. A stuck tap is a real bitch to deal with. But, if you get a set of left-twist drillbits, they're useful for the rare situations where you have to do all this. Worst case, they work no better than the right-twist drills. Keep 'em with your ez-outs, and you're half way there. In the US, you can buy those drills from the Eastwood company; they sell car restoration supplies and tools. Pricy but a good catalog with otherwise hard to find stuff.