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A bit of fun drilling holes

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NormanV:
I found this video on youtube.

I have some carbide drills from Dremel that are broken, here is a good one.

NormanV:
When the drill point breaks off they are not dissimilar from the drill shown in the video. So I thought that I would give it a go. The result was interesting. I set my drill on its highest speed and drilled away. Initially it seemed to go exactly the same as in the video. The metal heated up to red and the point of the drill started to enter the metal. Then the "carbide" tip sheared off and left me with a hole nicely plugged with a piece of carbide. It's a shame for a moment I thought that it was a process that I could use.

NormanV:
Here's a shot from the underside, sorry about the focus but you can just about see the point of the drill where it penetrated.

NormanV:
And here is what happened to the drill.
Probably the wrong sort of carbide!
It's a pity, it could have been useful.

John Hill:
Seems like an excellent way to make holes for threading in thin stock.

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