Wheeled glass cutters are essential for creating glass mosaics. I use it to cut and shape vitreous glass and stained glass. It can also be used to cut smalti. The wheeled cutters make cleaner cuts than tile nippers. The two carbide wheels (or steel, if you buy cheap cutters) are fixed in position. Instead of scoring and breaking, the wheels apply even pressure to the top and bottom sides of the glass, causing it to fracture along the line of the wheels.
The wheels are replaceable and eventually go dull, but not before several thousand cuts. Each wheel is held in place by a setscrew (usually an Allen screw). As your cuts become noticeably less clean than when the cutters were new, use an Allen wrench to loosen the screws, rotate each wheel about 1/8-inch, and then re-tighten the screws. By changing the location of where each wheel touches the glass, you have, in effect, replaced the blades. It'll take a long time and many cuts to use the entire circumference of the wheels, especially if they're carbide.
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