Ark Posted June 7, 2011 Share Posted June 7, 2011 I've got a small problem with a sheared bolt on the radiator clamp - annoying. So I'm trying to drill and extract it, but am having real trouble just drilling through - I've already snapped two drill bits and blunted at least one more. Has anyone got any hints and tips for this, or bright ideas for getting the bolt out? Thanks Quote Link to comment Share on other sites More sharing options...
hodge Posted June 7, 2011 Share Posted June 7, 2011 There's no other way but drill it out. You've burned the drill out cos you have pushed too hard whilst it was drilling so it's just rubbed instead of cut. The outside of where you drilled will now be hardened and won't cut straight out. You need to now start with a much small drill and drill the centre through. I'd say 2mm. Then move up to 3mm, then 4mm then 5mm. It will go eventually but DO NOT push too hard on the drill. If you can use some cutting compound on the end of the drill to assist cutting and help cool the tip if not just keep stopping removing the drill and spitting on the end, that will do lol. Quote Link to comment Share on other sites More sharing options...
dude Posted June 7, 2011 Share Posted June 7, 2011 Is that why they keep spitting on things in porn films ????? Cause they have hardened. Quote Link to comment Share on other sites More sharing options...
bignum Posted June 7, 2011 Share Posted June 7, 2011 Chris, is there any of the bolt still protruding, if so you could give it a good soak with plusgas(lube), leave overnight, then maybe get some molegrips on it. Quote Link to comment Share on other sites More sharing options...
hodge Posted June 7, 2011 Share Posted June 7, 2011 Is that why they keep spitting on things in porn films ????? Cause they have hardened. Ahahahahahahaha you got that right John lol. I can't see a pornstar sticking Rocol cutting compound on his nob though lmao. Quote Link to comment Share on other sites More sharing options...
Dnk Posted June 8, 2011 Share Posted June 8, 2011 Get a solid carbide drill bit Quote Link to comment Share on other sites More sharing options...
hodge Posted June 8, 2011 Share Posted June 8, 2011 Get a solid carbide drill bit That would do it but would cost a fortune. Quote Link to comment Share on other sites More sharing options...
Dnk Posted June 8, 2011 Share Posted June 8, 2011 That would do it but would cost a fortune. Their not cheap but not too bad £12 for a 5mm diameter drill from http://www.cutweltools.co.uk Quote Link to comment Share on other sites More sharing options...
ronttuk Posted June 8, 2011 Share Posted June 8, 2011 I drill a small hole then slowly increase the size of the drill until the bolts drilled out Quote Link to comment Share on other sites More sharing options...
Ark Posted June 8, 2011 Author Share Posted June 8, 2011 There's no other way but drill it out. You've burned the drill out cos you have pushed too hard whilst it was drilling so it's just rubbed instead of cut. The outside of where you drilled will now be hardened and won't cut straight out. You need to now start with a much small drill and drill the centre through. I'd say 2mm. Then move up to 3mm, then 4mm then 5mm. It will go eventually but DO NOT push too hard on the drill. If you can use some cutting compound on the end of the drill to assist cutting and help cool the tip if not just keep stopping removing the drill and spitting on the end, that will do lol. I did get a 2mm to go through, but curiously the 3mm doesn't want to chase it down... Next time I'll remember to use a drop of 3-in-1. Should I get hold of a variable speed drill too? Would the single speed power drill I have be too fast? Chris, is there any of the bolt still protruding, if so you could give it a good soak with plusgas(lube), leave overnight, then maybe get some molegrips on it. No mate, it got sheared flush with the plate - nothing left to grip. Their not cheap but not too bad £12 for a 5mm diameter drill from http://www.cutweltools.co.uk Ah hah! Maybe that's the ticket. The rate I'm snapping those B&D Piranna drill bits, that would probably work out cheaper! Are those suitable for hand drills though? The info suggests they are intended for proper machining use. Quote Link to comment Share on other sites More sharing options...
Dnk Posted June 8, 2011 Share Posted June 8, 2011 I personally wouldn't keep going up in size the way you are, the rad clamp bolts are M6 i think so put a 4.5 mm drill through and use an easyout. You can use the carbide drills in hand drills but you'll need to be carefull, also small drills require quite high speeds and i doubt your drill is fast enough. If you use a carbide wear goggles or safety glass's as they are very brittle Quote Link to comment Share on other sites More sharing options...
Dnk Posted June 8, 2011 Share Posted June 8, 2011 (edited) Diameter Steel Aluminium 3mm 1820 rpm 2580 rpm Edited June 8, 2011 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
Westy Posted June 8, 2011 Share Posted June 8, 2011 As stated - start small and get bigger! Quote Link to comment Share on other sites More sharing options...
Iky Posted June 8, 2011 Share Posted June 8, 2011 How about one of those Cobalt ones from toolstation? only cost a few quid. I had to drill out about 50 broken ones on my 200sx around the engine bay. Keep some wd40 on it and you'll be fine. Quote Link to comment Share on other sites More sharing options...
hodge Posted June 8, 2011 Share Posted June 8, 2011 There's your problem. You need a variable speed drill. Each drill must be ran at a different speed and feed in reference to the drill size and type. Quote Link to comment Share on other sites More sharing options...
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