barcode scanner code in asp.net MACHINING AND ROUTING in Software

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Laser Routing with CNC Equipment Laser routing can be an effective alternative to mechanical routing especially for flexible circuit board materials. Laser cutting is very accurate, allowing for the profiling of very small parts. There are several types of lasers in use, and some equipment uses more than one type in a single piece of equipment. Some laser types include the following:
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Nd:YAG (neodymium-doped yttrium aluminium garnet; Nd:Y3Al5O12), a crystal that is used as a lasing medium for solid-state lasers CO2 cuts using heat only UV cuts using both thermal and chemical reaction
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It is important to match your application and material with the laser type. Using the wrong application can result in burned material.
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Tooling To simplify tooling and expedite loading and unloading operations, effective hold-down and chop-removal systems should be provided as part of the machine design. Various methods may then be devised to mount the boards to the machine table while properly registering them to facilitate routing the outline. Some machine designs have shuttle tables available so that loading and unloading may be accomplished while the machine is cutting. Others will utilize quick-change secondary tooling pallets or subplots that allow rapid exchange of bench loaded pallets with only a few seconds between boards. 35.4.6.1 Tooling Plates. Tooling plates utilize bushings and a slot on the centerline of the active pattern under each spindle. They are doweled to the machine table (Fig. 35.10). The plates may be made by normal machine shop practice, or the router may be used to register and drill its own tooling plate. Mounting pins in the tooling plate should be light slip fit. 35.4.6.2 Subplates. Subplates should be made of Benelax, linen phenolic, or other similar material. The pattern to be routed should be cut into the subplates surfaces. The patterns act
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FIGURE 35.10
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Typical tooling of numerically controlled routing.
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PRINTED CIRCUITS HANDBOOK
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FIGURE 35.11
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Tooling schematic for numerically controlled routing.
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as vacuum paths and aid in chip removal. Part-holding pins should be an interface fit in subplates and snug to loose-fit in the part, depending on cutting technique used (Fig. 35.11). It is recommended that the programmer generate the tooling and hold-down pinholes in addition to the routing program. That will provide absolute registration between the tooling holes and the routing program. 35.4.7 Cutting and Holding Techniques Since the precision required for cutting board outlines, as well as the placement of tooling holes for registering boards, will vary, a number of different cutting and holding methods may be used. Three basic methods are illustrated here. Experimentation will determine which method or combination of methods is most applicable to a particular job. With all methods, the minimum dimension for board separation with a 0.125 in. cutter is 0.150 in. No-internal-pin method If no internal tooling pins are used, the procedure of Fig. 35.12 may be employed, but it is normally used only when no other method is possible. Characteristics of this method are as follows: accuracy, 0.005 in.; speed, slow (best used with many small parts on a panel); load, one panel high for each station. FIGURE 35.12 No-internal-pin method. Step 1: Cut Single-pin method The single-pin method is illustrated in three sides (a). Step 2: Apply masking tape (b). Step 3: Fig. 35.13. Characteristics of this method are as follows: Cut parts away. accuracy, 0.005 in.; speed, fast (quick load and unload); load, multiple stacks. Double-pin method In the two-pin method, there is a double pass of cutter offset; see Fig. 35.14. Make two complete passes around each board, the first pass at a recommended feed rate and the second at 200 in./min. Remove scrap after the first pass. Characteristics of this method are as follows: accuracy, 0.002 in.; speed, fast (highest-accuracy system loads and unloads slower than single-pin method due to tight pins); load, multiple stacks.
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