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  #1  
Old 07-05-2022, 04:21 PM
staybusy staybusy is offline
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Default Oh God no

I was drilling a pilot hole through 1" plate and the drill bit snapped around 9/10 the way down and it broke off beneath the surface.

Can someone aware me just how much misery I'm in for trying to extract it?
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  #2  
Old 07-05-2022, 05:16 PM
staybusy staybusy is offline
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my current thinking is to hit it with a torch then let it cool slowly to remove some of the hardness from it. then I can maybe drill it out with another bit

or maybe a screw extractor?

try to make one of these? https://www.amazon.ca/Extractor-Brok...dp/B07KGBBD6W/

Last edited by staybusy; 07-05-2022 at 05:29 PM.
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  #3  
Old 07-05-2022, 05:45 PM
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Ironman Ironman is offline
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Locate the point that you drilled from on the other side of the plate. Use a larger drill for a pilot on this side. Drill the hole through from the reverse side with the larger pilot size and when you break through, take a pin punch and drift it out.
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  #4  
Old 07-05-2022, 08:19 PM
staybusy staybusy is offline
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Quote:
Originally Posted by Ironman View Post
Locate the point that you drilled from on the other side of the plate. Use a larger drill for a pilot on this side. Drill the hole through from the reverse side with the larger pilot size and when you break through, take a pin punch and drift it out.
Brilliant! Thanks so much
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  #5  
Old 07-05-2022, 08:36 PM
Lew Hartswick Lew Hartswick is offline
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Since it looks easy to locate from the back, that is the obvious way to do it.
...lew...
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  #6  
Old 07-05-2022, 09:04 PM
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Shade Tree Welder Shade Tree Welder is offline
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did you try grabing the flutes with a needle nose plier and wiggling it out?
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  #7  
Old 07-05-2022, 10:50 PM
staybusy staybusy is offline
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Ended up getting it out. Turns out the drill bit was 99.9% through when it snagged, when I hit the backside of the steel with the center punch it actually pushed the bit back out enough for me to grab with pliers. Took about 20 seconds to get out.

When it broke I thought it was going to be one of those "4 hours of hell" type of jobs to extract. Appreciate your help fellas.
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  #8  
Old 07-05-2022, 11:40 PM
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Quote:
Originally Posted by staybusy View Post
Ended up getting it out.
I second what Gerry said but it sounds like you did OK. Sometimes it helps to talk it out with others to "see" the fix...
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  #9  
Old 07-06-2022, 01:14 AM
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LKeithR LKeithR is offline
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If you've drill almost all the way through (but with no sign of breakout) you can often take a heavy centre punch and give the piece of material a good whack on the back of the hole. Similar to Gerry's suggestion but you don't have to drill a hole on the backside. It won't work if there's too much material left...
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Old 07-08-2022, 08:06 PM
Norcal Norcal is offline
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Always great when a job you fear the worst about & after starting it things actually go well.
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