MadModder
Gallery, Projects and General => Neat Stuff => Topic started by: NormanV on November 26, 2017, 09:22:47 AM
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I found this video on youtube.
I have some carbide drills from Dremel that are broken, here is a good one.
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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.
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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.
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And here is what happened to the drill.
Probably the wrong sort of carbide!
It's a pity, it could have been useful.
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Seems like an excellent way to make holes for threading in thin stock.
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Just looking at the hole finish reminded me of a trick the fitters used at work to flare the end of nylon tubing. They simply spun a shaped piece of steel in the portable drill to flare the end of the tubing. Friction did the melting of the nylon.
Yarn was then blown through the 20odd feet tube to the needle head of carpet tufting machines. Think sewing machine with maybe 2000 needles and no bobbin.
So, the holes as in the video, would work where one needed to pass cable / rope through a plate without a rough lead in, the underside though would need some work.
John B
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I think the bit in the video was at least 1/4" diameter, thermal mass and conductivity might make the difference.
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Hi Norman
I seem to recall seeing something similar, where a cobalt drill was used.
Cheers David