Anybody have any experience of cobalt drill bits? |
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Rob Farmer
Senior Member Joined: 05 Sep 2015 Location: Loughborough Status: Offline Points: 154 |
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Posted: 15 Nov 2015 at 10:53 |
I'm in the process of stripping my rear wheel down (1980 Spada)
one of the three 6mm bolts that hold the cush drive plate in place is missing and has obviously sheared off in the past. Looking at it this morning someone has tried to drill it out and there is what appears to be an "easy out" snapped off in the bottom of the bolt. I'm thinking of trying a cobalt bit but have no experience of them. Do you think it would do the job?
Edited by Rob Farmer - 15 Nov 2015 at 11:04 |
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Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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I think you'll run too much of a risk of damaging the wheel as the drill slips off the (very hard)easy out.Spark erosion is the only way of removing a locked in easy out that I've ever found.Others may have found alternative ways.Best of luck!!
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TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
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Rob Farmer
Senior Member Joined: 05 Sep 2015 Location: Loughborough Status: Offline Points: 154 |
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Just been told a solid carbide bit should do it.
I may give the spark erosion route a try though. Thanks Any recommended spark erosion companies in the East Midlands?
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Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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Can't recommend any specific company in your area but there are many around if you Google for them.Let us know how you get on.
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TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
1971 V7 Special. 1972 850GT. 1970 T120 Bonnie. 2009 500 Bullet. |
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exsmokingbiker
Senior Member Joined: 14 May 2014 Location: Blaby Leicester Status: Offline Points: 981 |
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solid carbide will be no good - i use them at work for drilling studs etc
but if the end of the carbide drill snaggs the whole drill explodes |
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For all your engineering- ultrasonic and aquablasting needs see WWW.bike-aquablasting.co.uk
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Android
Senior Member Joined: 14 May 2014 Location: Frogham, Hants Status: Offline Points: 433 |
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Solid carbide drills are very brittle, if you can got a carbide rotary burr, don't run it too fast and just gentle pressure, they cut easyouts no problem.
Carbide drills are great in a machine but not hand drill. Do you have a green grit grinding wheel maybe sharpen up a masonry drill bit, again run it slow. Edited by Android - 15 Nov 2015 at 15:58 |
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But can buy a bike and that's pretty close! Moto Guzzi 1200 Sport |
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Rob Farmer
Senior Member Joined: 05 Sep 2015 Location: Loughborough Status: Offline Points: 154 |
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I do have a Green Grit wheel, left over from when I had a lathe, I'll try sharpening a masonary bit. Thanks I also have a few dental burrs. I'll try those as well.
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