Things You'll Need
Glass panes in home improvement stores are only available in a few set sizes, meaning that if you require an unusually sized pane of glass, you may have to have the glass custom cut. While some establishments will cut the glass for you for a nominal fee, it is just as easy to take the glass home and cut it yourself. Before you cut the pane, be sure to measure twice to ensure that you only cut once. It is difficult to remove small strips of glass to compensate for minor measuring mistakes.
Place the plane of glass onto your work table.
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Put on your gloves and goggles.
Lubricate the edge of the glass cutter. Apply a few drops of oil to a rag, then run the rag along the edge of the glass cutter's wheel.
Hold your framing square along the line that you want to cut.
Score the glass along the edge of the framing square with your glass cutter. Pull it down with firm pressure in a single stroke; do not run the scorer back and forth. If you're applying enough pressure, you'll hear a crackling sound as you score.
Put on your work gloves and goggles.
Line the scored edge of the glass pane up with the edge of your work table. The larger section should be on the table while the shorter section should hang over the table's lip.
Weigh the larger section of the glass down by placing your hand flat on its surface.
Grip the edge of the short section of the glass pane and press downward with medium pressure until the glass pane snaps.
Cut the second glass pane following steps 1 through 7. Instead of using the framing square as a guide, however, use the cut plane of glass to ensure that the two panes are guaranteed to be the same size.