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I managed to cut old glass with this
on 3 November 2013
I had some old greenhouse to cut down. I had previously smashed up a lot by trying with a diamond point tool, and then found a website that led me to the following recipe:
1) Use a wheel (like this), it cracks deeper than a diamond point.
2) Polish the glass with cream cleanser, this blunts mini-cracks that may lead the cut awry.
3) Stick a steel rule down with double sided tape to avoid sliding.
4) Score with the tool, once, firmly. Go to the end but take care not to bang down off the end.
5) Paint score line with caustic soda (or bleach). This is reputed to weaken molecular bonds in the glass.
6) Do not try to break by bending! Turn over the glass onto cardboard on firm table and tap moderately firmly along the score line with something like a small cold steel chisel. Persist until the score crack has gone through the glass all the way along (patience) and the glass readily breaks with the gentlest bending.
(Not sure how much (2) and (5) do, and nothing is guaranteed with old and brittle glass. However, in my experience, this recipe works - mostly). And this is the tool for the job.