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A bit of fun drilling holes

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SwarfnStuff:
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

Nicolas Hulme:
I think the bit in the video was at least 1/4" diameter, thermal mass and conductivity might make the difference.

Meldonmech:

  Hi Norman
                               
                    I seem to recall seeing something similar, where a cobalt drill was used.

                                                            Cheers David

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