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Why is it necessary to make a deep scratch around the glass tubing to be cut with single stroke in one direction?
Wiki User
∙ 10y ago
It is not necessary to score tubing to be cut all the way around. Depending on the diameter anything from a small nick to a 5mm - 10mm scratch is enough. If you wet the scratch then dab on it with a molten piece of glass it will crack evenly all the way around.
The cutting on one direction has one purpose. If you go over scratches more than once with your knife, it will blunt your tungsten carbide blade very quickly, as the small amount of glass dust in the scratch acts as an abrasive.
Wiki User
∙ 10y ago
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