Art glass designs don't have to be difficult. Many people only have the fundamental skills necessary to cut pieces of glass for a lamp or fireplace and find that they frequently breach their glass in places they don't need. Here are some simple ideas that can help you. Remember: until you are ready to place your glass in a pub, you must have the ability to faithfully cut it.
First, make sure you don't push too hard. How will you know if you are enthusiastically cutting your glass patterns too? The scoreline will likely be visible and small glass fragments may appear as the cutting wheel travels across the surface of the glass. You can check https://www.artglasssupplies.com/casting-molds for information on various glass patterns.
You can still split the glass on a scoreline similar to this, however, the results aren't predictable and with thin melting glass, you may have a real problem.
Also do not press too gently. If you can't hear the dent being created or can't find the marker enough, then it will be difficult to break this glass predictably or efficiently. The scoreline here just isn't deep enough for the glass to go along with it, and that means you can expect it to break into weird patterns.
Doing them is a company, constant pressure. Some prefer pistol grip pliers because of their better ergonomics. This is a scenario where it pays to spend a little more on a fantastic cutter. Don't forget to press with your whole body, not your wrists, and hold on while scoring because it presents a much better angle.