Sam Thompson Posted May 6, 2010 Share Posted May 6, 2010 Has anyone got any idea what this is? It's tapered and it's got a square, left-handed thread. The shank shows signs of having been turned clockwise in a chuck. It doesn't look like an east-out, which usually fit into a tap wrench and the material appears to be softer (marks on shank). Quote Link to comment Share on other sites More sharing options...
pkrankow Posted May 6, 2010 Share Posted May 6, 2010 My best guess is it is a lead screw or worm gear, possibly to wind a mechanism or part of a winch assembly. $0.02 Phil Quote Link to comment Share on other sites More sharing options...
John B Posted May 6, 2010 Share Posted May 6, 2010 Looks like it could be a misused masonry drilling bit thats seen better days Quote Link to comment Share on other sites More sharing options...
Sam Thompson Posted May 6, 2010 Author Share Posted May 6, 2010 That's what I thought at first glance; it's the tapered left handedness of it that's confusing me. Quote Link to comment Share on other sites More sharing options...
lazyassforge Posted May 6, 2010 Share Posted May 6, 2010 A tapered pin reamer for use in a milling machine? Like the one shown here: http://metalworking.mscdirect.com/CGI/NNPDFF?PMPAGE=207&PARTPG=MWSRCH&PMITEM=02402139&PMCTLG=54&PMT4TP=*LTIP Bill Davis Quote Link to comment Share on other sites More sharing options...
Sam Thompson Posted May 6, 2010 Author Share Posted May 6, 2010 It's exactly the same as the one bottom right, Thanks Bill... now I can sleep at night! Why the LH flutes? Quote Link to comment Share on other sites More sharing options...
lazyassforge Posted May 7, 2010 Share Posted May 7, 2010 The reamer cuts right hand just like a normal drill bit(right hand), the flutes are left hand so it "pushes" itself out of the hole. If the flutes were right hand, it would tend to pull itself into the hole and cut too much out of the hole or jam up. Hope this helps! Bill Davis Quote Link to comment Share on other sites More sharing options...
Sam Thompson Posted May 7, 2010 Author Share Posted May 7, 2010 Obvious really... If you think about it! Quote Link to comment Share on other sites More sharing options...
Sukellos Posted May 7, 2010 Share Posted May 7, 2010 It's a masonry bit for a HILTI hammer-drill. We have dozens of them here in our shop. That one has seen a heap of use and/or abuse. I can't find the camera or I'd send you a pic of some newer ones. Quote Link to comment Share on other sites More sharing options...
Hillbilly iron Posted May 9, 2010 Share Posted May 9, 2010 Has anyone got any idea what this is? It's tapered and it's got a square, left-handed thread. The shank shows signs of having been turned clockwise in a chuck. It doesn't look like an east-out, which usually fit into a tap wrench and the material appears to be softer (marks on shank). Hi there it looks like a Dyna drill bit( for cutting concrete) with a handle Quote Link to comment Share on other sites More sharing options...
Sam Thompson Posted May 9, 2010 Author Share Posted May 9, 2010 It's definitely one of these: http://metalworking.mscdirect.com/CGI/NNSRIT?PMCTLG=00&PMAKA=02402964&returnurl=MTL&partnerURL=http://catalogs.shoplocal.com/jlindustrial/ind Quote Link to comment Share on other sites More sharing options...
John B Posted May 9, 2010 Share Posted May 9, 2010 What size is it Sam? You missed that bit out on your original pic, which may have come up larger than it actually is which may have caused the differences in interpretation. Quote Link to comment Share on other sites More sharing options...
Sam Thompson Posted May 9, 2010 Author Share Posted May 9, 2010 Yes, sorry everyone, I've just realised that! It's about 4'' long, about the right size for the cotter pins on a bicycle crank. Quote Link to comment Share on other sites More sharing options...
John B Posted May 9, 2010 Share Posted May 9, 2010 Or pins on Blackers ! Quote Link to comment Share on other sites More sharing options...
Sam Thompson Posted May 10, 2010 Author Share Posted May 10, 2010 It's too small for that but I've just tried it and it works well. Quote Link to comment Share on other sites More sharing options...
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