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Tool Talk Discussion Forum

buying left hand drills and extractors

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kkraig

01-06-2007 18:06:19




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I am going to purchase left hand drills and wonder what is the best kind to by, cobal, titanium or is there some thing better? I also am wondering about a kind of easy out,drill out power extractors? are these good? I just broke a spiral east out off in a bolt and was wondering if there was a better kind. Any info would be appreciated, thanks.




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Jon Holt

01-07-2007 20:29:22




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 Re: buying left hand drills and extractors in reply to kkraig, 01-06-2007 18:06:19  
Where I work at we just have someone from the weld shop come over and weld a nut onto the broken bolt and then just wrench it out. It seems to work a lot better than ez outs.



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630crazy

01-07-2007 10:42:33




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 Re: buying left hand drills and extractors in reply to kkraig, 01-06-2007 18:06:19  
If your easy-out was a good one you will have a H311 of a time drilling it out. What type of material is it broke off in? If its cast just take a torch and blast it out, then tap the treads clean.



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TimV

01-07-2007 08:44:17




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 Re: buying left hand drills and extractors in reply to kkraig, 01-06-2007 18:06:19  
KKraig: Don't worry a lot about what type of coating the drills have. In most cases, coatings are just a marketing gimmick, and don't appreciably aid performance. Buy a good name-brand set, even if it's just plain uncoated High Speed Steel. The thing is, the only time you'll use these is when you already have a problem--you don't want to compound the problem by breaking off a cheap drill bit in the hole.

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Gerald J.

01-06-2007 19:33:53




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 Re: buying left hand drills and extractors in reply to kkraig, 01-06-2007 18:06:19  
I get my left handed bits from McMaster-Carr, the last ones were 135 degree split point and they drilled nicely without catching.

An easy out isn't as strong as the rust. Now that you have broken it off you may have to grind it out with a dremel and die grinder and a sack of small stones.

A good penetrating oil, like Kroil is essential to the removal process. Many report that welding a washer and a nut to the end of the broken bolt makes it come out. Heating the bolt alone often shrinks it because it would have expanded but the cold metal around it prevents that expansion and when it gets hot enough to be soft it shrinks and when its cool its often loose.

Gerald J.

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old

01-06-2007 19:33:07




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 Re: buying left hand drills and extractors in reply to kkraig, 01-06-2007 18:06:19  
I have a set of E-Z outs that work very well. I have never broken one an I have used them on some pretty hard to ge out stuff. They aren't cheap, the set cost me around $75 7 years or so ago. These are only about an inch long and you don't hammer them in like the type that brake easy. You just stick them in and as you turn them they sort of just pull them selfs down till the bolt or what eve come out

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