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Removing a sheared bolt.
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Peter_L



Joined: 10 Apr 2008
Posts: 2680
Location: New Brunswick. Canada.

PostPosted: Sun Mar 07, 2021 3:44 pm    Post subject: Removing a sheared bolt. Reply with quote

I like the DIY "hole through a bolt idea" 4:18>

https://www.youtube.com/watch?v=dJfkCj3FWBs&t=199s
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peter scott



Joined: 18 Dec 2007
Posts: 7113
Location: Edinburgh

PostPosted: Sun Mar 07, 2021 11:12 pm    Post subject: Reply with quote

Very sensible. Thanks for posting.

Peter
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Peter_L



Joined: 10 Apr 2008
Posts: 2680
Location: New Brunswick. Canada.

PostPosted: Sun Mar 07, 2021 11:51 pm    Post subject: Reply with quote

peter scott wrote:
Very sensible. Thanks for posting.
Peter


So simple, I can't believe it took me half a century to learn this. Especially being able to get a drill bit to start on the top of a rough, sheared bolt. I wouldn't mind having to start a 1/8th and work upward.
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alastairq



Joined: 14 Oct 2016
Posts: 1950
Location: East Yorkshire

PostPosted: Mon Mar 08, 2021 11:26 am    Post subject: Reply with quote

My experience of sheared bolts has been, they have sheared close enough to the top surface that there is very little of the bored thread showing. Yet, far enough down the hole to make tapping out hazardous ....[to the threads]

The only thing I might be wary of [considering my ability to make any drill wobble]....is the gradual enlargement of the bored hole in the cap bolt, as the drill turns inside?
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Bitumen Boy



Joined: 26 Jan 2012
Posts: 1733
Location: Above the snow line in old Monmouthshire

PostPosted: Mon Mar 08, 2021 3:23 pm    Post subject: Reply with quote

alastairq wrote:
My experience of sheared bolts has been, they have sheared close enough to the top surface that there is very little of the bored thread showing. Yet, far enough down the hole to make tapping out hazardous ....[to the threads]

The only thing I might be wary of [considering my ability to make any drill wobble]....is the gradual enlargement of the bored hole in the cap bolt, as the drill turns inside?


I reckon you would have to consider the bored out bolt as a simple, disposable jig. Of course if you had a lathe to make your own as required that shouldn't really be an issue.
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Whitegoatie



Joined: 01 Feb 2016
Posts: 59
Location: Stamford, Lincolnshire

PostPosted: Sat Dec 18, 2021 2:46 pm    Post subject: Reply with quote

Yeah right. In my experience they break off nearly flush to the surface, usually because they are seized and nearly always in a situation where you cant get at them...

How did he manage to snap a bolt half way down the thread on a new looking bit of equipment?

I've had some success removing sheared bolts/studs by mig welding a nut to the visible shear, then undoing while still hot. Heat works wonders.
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