Acrylic, also known as plexiglass, is the most commonly used engraving material. It is easy to cut and engrave. It has a variety of shapes and sizes, and relatively low cost. It is the basic material for making crystal characters. At present, there are many kinds of acrylic production art on the market, the common ones are casting and calendering. The laser engraving machine mainly uses the casting method to produce acrylic, because the frosting effect produced after laser engraving is very white, which is distinct from the original transparent texture. In contrast, the plexiglass produced by the calendering method is still transparent after laser engraving, and there is no sufficient contrast effect. When buying plexiglass, you should emphasize to the dealer that you want a good kind of high purity, otherwise the material you bought back may melt during engraving or cutting. The following are CNC Router machine acrylic engraving tips.
Engraving
Under normal circumstances, the plexiglass adopts the method of back carving, which means that it is carved from the front and viewed from the back, which makes the finished product more three-dimensional. When engraving the back, please mirror the graphics first, and the engraving speed should be fast and the power should be low. If the power is too high during engraving, uneven stripes will appear on the bottom surface. If you want to engrave deeper, try engraving several times. In the case of back carving, for partial coloring, the coloring should be carved deeper first, and then polished with a flame polishing machine, before the color can be filled. If it is not polished, the color seen from the front will not be uniform.
Cut
Plexiglas is relatively easy to cut. If the customer's requirements are not high, it can be delivered after cutting without flame polishing. Otherwise, the blowing device should be used when cutting to improve the quality of the cut. When cutting plexiglass over 8mm, large-size lenses should be replaced.
clean
After engraving, you can use a damp cloth to clean the surface
coloring
Acrylic pigments can be used, other pigments may damage the finish of plexiglass.
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