Cutting glass jars into cups - GIF

Cutting glass jars into cups.

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Previously:

Glass cutout hammer - GIF
Glass scalloping - GIF
Glass thread cutting - videos
Glass tube bending machine - GIF
Hot glass passing through roller - GIF

I do not see how the cut the glass?

Quote:

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Originally Posted by Ralphxyz

I do not see how the cut the glass?

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Between .001and .005 the jar is being rotated with what looks like a bar near it with a tightly controlled flame if you can watch it closely you can see a score line appear