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Cork boring is making the corks for wine bottles. The tool used looks like a sharpened tube. I'm assuming that tool posted above is what is used to sharpen the tube…
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Actually the cork borers that use the pictured tool were primarily used to make holes in corks or rubber stoppers for laboratory glassware. Each laboratory (mostly chemical labs but could be medical labs as well) had various flasks, condensers, tubes, etc. that needed to be connected and sealed. Boring the correct hole in the stopper allowed laboratory people to connect these pieces of equipment together without leaks. They also occasionally bored holes in peoples hands, books, papers, lab bench tops when the borer slipped or penetrated through the stopper to the backer. Don't ask me how I know. I do have a complete set of cork borers that I use to cut holes in gasket material. Corks for wine bottles are cut on a machine or now molded from plastic, cork pieces or other elastomers.
