barcode scanner code in asp.net FIGURE 35.3 Typical adjustable shear blades for copper-clad laminates. in Software

Generate QR in Software FIGURE 35.3 Typical adjustable shear blades for copper-clad laminates.

FIGURE 35.3 Typical adjustable shear blades for copper-clad laminates.
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MACHINING AND ROUTING
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be cut, the greater the rake or scissor angle between the top and bottom shear blade. The converse also is true:The thinner the material, the smaller the rake angle and the closer the blades. Hence, as in many metal shears, the rake angle and the blade gap are fixed; the cutoff piece can be twisted or curled. Paper-base material can also exhibit feathered cracks along the edge that are due to too wide a gap or too high a shear angle. That can be minimized by supporting both piece and cutoff piece during the shear operation and decreasing the rake angle. Epoxy-glass laminate, because of its flexural strength, does not usually crack, but the material can be deformed if the blade clearance is too great or the shear angle is too large. As in blanking, the quality of a part produced from paper-based laminates by shearing can be improved by warming the material before performing the operation. 35.3.4 Sawing Paper-Base Laminates Paper-base laminates are much harder on sawing tools than are the hardest woods, and therefore a few special precautions are necessary for good saw life. Sawing paper-based laminates is best accomplished with a circular saw with 10 to 12 teeth per inch of diameter at 7500 or 10,000 ft/min. Hollow-ground FIGURE 35.4 Commonly used saw tooth designs for saws give a smoother cut; and because of the paper and cloth laminates. At left, two successive teeth abrasive nature of laminated materials, car- on a 15 alternate-bevel saw. At right, two successive teeth on a 30 ft alternate-corner-relieved (AC-30) saw. bide teeth are an excellent investment. (See Fig. 35.4 for tooth shape.) When a saw does not last long enough between sharpenings, use the following checklist. (These steps could have a cumulative effect and change saw life by a factor of 4 to 5.) 1. Check the bearings for tightness. There should be no perceptible play in them. 2. Check the blade for run-out. As much as 0.005 in. can be significant. 3. When carbide teeth are used, inspect them with a magnifying glass to make sure a diamond tool no coarser than 180 grit was used in sharpening them. 4. If the saw has a thin blade, use a stiffening collar to reduce vibration. 5. Use heavy pulleys with more than one V belt. Rotating parts of the system should have sufficient momentum to carry the saw tooth through the work smoothly and without variation of speed. 6. Check the alignment of the arbor and the motor mounting. All these steps are intended to reduce or eliminate vibration, which is the greatest enemy of the saw blade. If vibration is noticed, find the source and correct it. 35.3.5 Sawing Glass-Base Laminates When glass-based laminates are to be sawn, carbide-tooth circular saws can be used; but unless the volume of work is quite low, the added investment required for diamond-steel-bonded saws will be paid for in future savings. The manufacturer s recommendation of saw speed should be followed; usually it will be for a speed in the neighborhood of 15,000 ft/min. at the periphery of the saw blade.When economics dictate the use of carbide-tooth circular saws for cutting glass, use the instruction previously given for paper-based laminates (see Fig. 35.4 for tooth shape)
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and remember that each caution regarding run-out, vibration, and alignment becomes more important when glass-reinforced laminates are sawn.
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35.4 ROUTING
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Modern circuit board fabricators rely principally on routing to perform profiling operations. The high cost and extended lead times for blanking dies, combined with the problem of design inflexibility of hard tooling, limit the punching operation generally to very high volumes or designs specific to die applications. Shearing or sawing are limited to rectangular shapes and generally are not accurate enough for most board applications. In the modern circuit board fabrication industry, rapid response to customer lead times and economies of universal process application are well served by routing, especially multiplespindle computerized numerical controlled (CNC) routing. Routing consists of two similar, yet vastly different fabrication processes:
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