common cnc engraver can t engrave spots with different shapes and sizes, so there is no grey scale. laser engraver has this function, so they have natural advantage in grey scale. people make use of this performance to save cost in pigmentation and increase layers of different graphics to enrich the presentation. when using the laser machine, users fill the graphics with different grey scale first (characters should be transformed to be graphics), then choose black and white mode for output of engraving, they can test the effect of different network. precision is less than 500dpi.
wood is the most common material for laser engraving and cutting. wood with light color, such as birch, cherry and maple, is easily vaporized by laser and suitable for engraving. each kind of wood has its own feature, some of them is compact, such as hard wood which should use big power laser for engraving or cutting. please make a study on material before engraving.
there is no much difference between engraving plywood and wood, the only point is engraving depth shouldn t be too deep. edge of plywood after cutting is also black like common wood, the key point is what kind of material the plywood is made of.
generally speaking, depth for engraving on wood is deep, so laser power is big and color of engraved graphics on hard wood is deep. for light color, you can increase the engraving speed to work several times. sometimes there is soot produced during working process, if there is paint on wood, you can clean it by wet cloth, if not, wood surface may be defiled by soot which can t be fully cleaned.
generally, laser engraver can t cut wood deeply, max. cutting depth depends on wooden material and laser power. for cutting thick wood, cutting speed should be low, but wood may be burnt. users can use big reflective and focus lens to make repeated cutting.
wood is just like being burnt after engraving, matched with original color, it is more like art. color depth depends on laser power and engraving speed. color of some soft wood such as birch can t be changed no matter how long you engrave it. propylene can be applied for pigmentation of finished products.