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Laser engraving metal plates are manufactured with a finely polished metal, coated with an enamel paint made to be "burned off". At levels of 10 to 30 watts, excellent engravings are made as the enamel is removed quite cleanly. Much laser engraving is sold as exposed brass or silver-coated steel lettering on a black or dark-enamelled background.
Color Laser Engraving is a marking process that uses a MOPA fiber laser source to mark color on a metal surface, such as stainless steel or titanium.. Color marking in this way is not often used as it can be a laborious process, impermanent and is costly - largely due to the machinery involved.
The CO 2 laser is suited for cutting, boring, and engraving. The neodymium (Nd) and neodymium yttrium-aluminium-garnet lasers are identical in style and differ only in the application. Nd is used for boring and where high energy but low repetition are required. The Nd:YAG laser is used where very high power is needed and for boring and engraving.
Draft angle design is an important factor when designing plastic parts. Because of shrinkage of plastic material, injection molded parts have a tendency to shrink onto a core. This creates higher contact pressure on the core surface and increases friction between the core and the part, thus making ejection of the part from the mold difficult.
Other terms often used for printed engravings are copper engraving, copper-plate engraving or line engraving. Steel engraving is the same technique, on steel or steel-faced plates, and was mostly used for banknotes, illustrations for books, magazines and reproductive prints, letterheads and similar uses from about 1790 to the early 20th century, when the technique became less popular, except ...
Initially, LaserDiscs were cheaper than videocassettes to manufacture, because they lacked the moving parts and plastic outer shell which were necessary for VHS tapes to work, and the duplication process was much simpler. A VHS cassette had at least 14 parts (including the actual tape) while LaserDisc had one part with five or six layers.