moglite
Part of things
Posts: 815
Club RR Member Number: 144
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Mar 21, 2019 21:17:15 GMT
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I've got some M6 and M8 bolts to remove, where the heads of the bolt have snapped off. I've got decent access, and I'll soak the stumps in plus gas, I can add some heat. But what screw extractors work well Something like this Or maybe some left hand drill bits and colbalt drills ?? Any other suggestions ? The bolts have broken off flush - so welding a nut to the stub isn't an option. Thanks
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1967 Morris Oxford Traveller 1979 Toyota LandCruiser BJ40 1993 Daimler Double Six 2007 Volvo XC70 2.4D
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Mar 21, 2019 21:38:05 GMT
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Can you pilot a bigger hole to centre it, then drill out to the required size and re-tap.
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moglite
Part of things
Posts: 815
Club RR Member Number: 144
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Mar 21, 2019 22:07:07 GMT
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Can you pilot a bigger hole to centre it, then drill out to the required size and re-tap. That is a possibility, but I think I'd like to try and get the rusty stub out in one piece if I can.
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1967 Morris Oxford Traveller 1979 Toyota LandCruiser BJ40 1993 Daimler Double Six 2007 Volvo XC70 2.4D
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Mar 21, 2019 22:22:30 GMT
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Do a google search for: Snap on C47B
By far the best bolt extractors I have ever owned.
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1988 Mercedes w124 superturbo diesel 508hp 1996 Mercedes s124 e300 diesel wagon 1990 BMW E30 V8 M60 powered! 1999 BMW E46 323ci project car
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Darkspeed
Club Retro Rides Member
Posts: 4,642
Club RR Member Number: 39
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Mar 21, 2019 23:02:14 GMT
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Flush can sometimes be done with a welder you can use a washer for a bolt one size smaller M4 - M6 and weld through the centre of the washer and then build up a head.
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stealthstylz
Club Retro Rides Member
Posts: 14,812
Club RR Member Number: 174
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Buy a left hand drill bit, do the plusgas/dear first then drill it. If it's gonna come out like that the drill will normally stick at some point and wind it out. If you get all the way through and it hasn't moved just drill the remains out and run a tap through it.
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tofufi
South West
Posts: 1,449
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Flush can sometimes be done with a welder you can use a washer for a bolt one size smaller M4 - M6 and weld through the centre of the washer and then build up a head. This ^^ done loads like that
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I hate using extractors, if (more like when) they snap off you have a massive problem, if I can't weld a nut or washer on I drill and tap them.
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moglite
Part of things
Posts: 815
Club RR Member Number: 144
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Some good feedback - thanks. I can't find an online source for the Snap-on extractors alas. I wasn't familiar with the washer technique - every day is a school day :-)
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1967 Morris Oxford Traveller 1979 Toyota LandCruiser BJ40 1993 Daimler Double Six 2007 Volvo XC70 2.4D
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Mar 22, 2019 11:47:26 GMT
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I hate using extractors, if (more like when) they snap off you have a massive problem, if I can't weld a nut or washer on I drill and tap them. Same as that, its always a heart stopping moment, is it going to come out or is it going to break!
Heats always good and so are the reverse flute drills
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Mar 22, 2019 13:42:29 GMT
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I've had to do quite a bit of this recently. Used both the lh cobalt drill and washer method where I could get access. On one of the wheel studs I was wondering why the cobalt drill was slow until I realised I was drilling out the previous guys extractor. Unsure whether the fact I I successfully drilled it out is testament to the quality of the drill bit, or the poor quality of the broken extractor.
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