Cutting Glass
When cutting glass, you really only scratch the top of the glass. Then, you cause a controlled breaking by exerting pressure on the scratched area. Straight cuts are fairly easy to make. Curved cut's, especially to the inside are rather difficult and take some time to perfect. In this case, you scratch concentric circles like ripples moving away from a thrown rock into water. Then you break one circle at a time until you reach the most inner circle. There are two main types of glass cutters. There is the pistol grip, a newer style of cutter that you hold in your hand like the pistol of a gun and push on the glass by orienting your thumb up and bending your wrist side ways. In this way, you push the cutter away from you to cut. There is also a straight glass cutter that is quite old. It is a straight piece of metal or wood with a metal ball on one end and a small wheel on the other end. Older models have a diamond tip instead of a wheel. This type of glass cutter fits in between the index and middle finger and is pinched between the thumb and index finger. It is pulled toward you as you cut. Just like a guitar player who develops calluses on his finger tips, you build up a callus between your index and middle finger with time. This helps so that the sensitive skin there isn't bothered every time you cut. Your knuckles are oriented up with this cutter and you don't have to bend your wrist as much. With practice, you can a achieve a steady even cut without stops and starts.
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