The float lines have automatic in-line inspection. If it detects a fault in the glass, it feeds the position of it into the cutting software. When that bit of glass reaches the cutting area, the software cuts around it and the faulty bit gets smashed - might have been that (or some of it, anyway!).Quite often the "crack" of the cut turned into the sound of a lot of glass bits hitting the floor . .
Stove glass isn't really glass - it's a transparent glass ceramic. It's made as a glass sheet, but then heat treated so that it mostly crystallises (and yet remains transparent). It's tough, and doesn't cut very well with a wheel (but it is possible).the stove glass
Fortheringhay forge ( sp? & look on line ) is a UK supplier of all sorts of sizes of burner parts fire bricks , glasses , seal cord & cements . etc . I used them several times over the yeas when we had log burnersMaybe going off topic, wifie broke the stove glass in the wood burner last year, come autumn, needs replacing.
Phoned local hardware shop, quoted €50 for 40 x60 cms if I remember correctly, per square meter €350.
Phoned Bricomarche to compare prices €950 per square meter.
Wow.....