Laser Cutting Acrylic for a Flame Polished Edge: Part 3

FOCAL LENGTH

The focal lens choice will play a role in the edge quality. Ideally a 2.5” lens will work with thicknesses up to 3/8-1/2”. Anything thicker may require a 4”, 5”, or maybe even a 7” lens. This is where laser power will come into play. When the focal distance increases, the amount of energy of the laser will seem to decrease. Not having enough power will mean slowing the laser down significantly to cut through the material. There is a point where cutting slower will not work because it will increase the chance of flare-ups that can occur when cutting acrylic too slow. Acrylic is flammable and the only cure for this is more laser power. Then the acrylic can be cut at optimal and production friendly speeds and still get the nice polished edge. Achieving a high quality edge with multiple passes is very difficult.
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