How to Cut Glass

How to Cut Glass.
Cutting (scoring and breaking) glass properly is a learned technique. Use 3mm float glass (windowpane glass) to practise cutting flow and amount of pressure to exert. Draw patterns A, B, C, D, E, and F (ppl9-21) on windowpane glass and practise the techniques of scoring and breaking before starting a project.
1 Wear safety glasses and a work apron. Stand in an upright position before the worktable.
2 Work on a clean, level, non-skid work surface covered with newspaper.
3 Place the glass smooth side up, on which the pattern has been traced with the marker.
4 Hold the cutter in your writing hand perpendicular to the glass, not tilted to the left or the right. Run the cutter away from your body and inside the pattern lines, applying steady pressure as you score.
See photographs below for different styles of cutters. Carbide steel wheel cutters will last for many years as opposed to disposable cutters.
5 Start and finish at an edge of the glass. Do not stop or lift your cutter from the glass surface before the score is completed. Use a fluid motion, applying constant, even pressure.
6 Never go over a score line a second time.
7 Grasp the glass with a hand on each side of the score line, thumbs parallel to the score, knuckles touching. Roll wrists up and outward, breaking the glass along the scored line.
Left: Disposable cutter held in traditional manner. The cutter rests between the index and middle fingers with the ball of the thumb placed to push the cutter along. The wheel must be lubricated before each score and wears out quickly.
Second: Oil-fed cutter held in traditional manner. If wheel and housing wear, they can be replaced.
Third: Pistol grip cutter held in palm of hand with the thumb resting on top of the barrel and index finger guiding cutter head.
Fourth: Pencil-style cutter, oil-fed, and held as a pencil.
To increase the probability of a good score and prolong the life of the glass cutter:
• Make sure the surface of the glass is clean and free of any debris.
• Score on the smoothest side of the glass.
• Lubricate the wheel of the glass cutter before each score. If a self-oiling cutter is being used, it will oil itself-but check occasionally to ensure that there is oil in the reservoir. Wipe away any small glass fragments that may have collected on the cutter wheel.
• Keep the cutter wheel covered when not in use.
In the above photo-left: score line with too much pressure; right: score line with correct pressure.

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