Re: Using left-handed drill bits - A QUESTION ????

Posted by JWC on September 03, 2001 at 12:34:00 from (130.74.184.124):

In Reply to: Using left-handed drill bits - A QUESTION ???? posted by Alberta Mike on September 03, 2001 at 07:26:20:

Mike,
Whether you use right or left handed bits, the centering of your hole is the most important. If you grind or file the end of the bolt flat and then center punch it you will increase your odds. I have successfully used screw/bolt extractors and also had the stubs turnout with a drill. Another method I have used is to drill a well-centered hole just slightly smaller than the tap drill for the bolt size and take a pick or small punch and remove the remains of the bolt from the hole and threads. A tap can then be run through the hole to finish cleaning the threads. The key to this is in not getting too destructive in trying the other methods first. An alternative to starting with a 1/8” bit is to start with a center drill, you might be less prone to twist it off. I work on a lot of equipment that use stainless steel and aluminum bolts. Many times they may be seized or galled. In cases where a grinder or nut breaker could not be used I have drilled a carefully centered hole the diameter of the bolt through the head. The head will then fall off and allow removal of the bolt. Duct tape, bailing wire, cutting torch or a large hammer just won’t take the place of patience and finesse in some applications.

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