barcode generator vb.net code FIGURE 15.3 RC velocity variation versus number of teeth. in Software

Creating UPC - 13 in Software FIGURE 15.3 RC velocity variation versus number of teeth.

FIGURE 15.3 RC velocity variation versus number of teeth.
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Large Sprocket. The number of teeth on the large sprocket normally should be limited to 120. Larger numbers of teeth are very difficult (expensive) to manufacture. The number of teeth on the large sprocket also limits maximum allowable chain wear elongation. The maximum allowable chain wear elongation, in percent, is 200/N2. Hardened Teeth. The fewer the number of teeth on the sprocket, the higher the tooth loading. Sprocket teeth should be hardened when the number of teeth is less than 25 and any of the following conditions exist:
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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CHAIN DRIVES 15.8
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The drive is heavily loaded. The drive runs at high speeds. The drive runs in abrasive conditions. The drive requires extremely long life.
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Angle of Wrap. The minimum recommended angle of wrap on the small sprocket is 120 . Speed Ratio. The maximum recommended speed ratio for a single-reduction roller-chain drive is 7:1. Speed ratios up to 10:1 are possible with proper design, but a double reduction is preferred. Center Distance. The preferred center distance for a roller-chain drive is 30 to 50 times the chain pitch. At an absolute minimum, the center distance must be at least one-half the sum of the two sprocket outside diameters. A recommended minimum center distance is the pitch diameter of the large sprocket plus one-half the pitch diameter of the small sprocket. The recommended maximum center distance is 80 times the chain pitch. The center distance should be adjustable to take up chain slack caused by wear. Adjustment of at least 2 pitches is recommended. If a fixed center distance must be used, consult a chain manufacturer. Chain Length. Required chain length may be estimated from the following approximate equation: L 2C + N1 + N2 N2 N1 + 2 4 2C (15.1)
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Equation (15.1) will give chain length accurate to within 1 2 pitch. If a more precise chain length is required, an equation for the exact chain length may be found in Ref. [15.5] or in manufacturers literature. The chain length must be an integral number of pitches. An even number of pitches is preferred. An odd number of pitches requires an offset link, and offset links reduce the chain s capacity. Wear and Chain Sag. As a chain wears, it elongates. Roller-chain sprocket teeth are designed to allow the chain to ride higher on the teeth as it wears, to compensate for the elongation. Maximum allowable wear elongation normally is 3 percent. Where timing or smoothness is critical, maximum allowable elongation may be only 1.5 percent. The size of the large sprocket may also limit allowable elongation, as noted earlier. As a chain elongates from wear, the excess length accumulates as sag in the slack span. In long spans, the sag can become substantial. It is important to design sufficient clearance into the drive to accommodate the expected amount of chain sag. For a drive with an approximately horizontal slack span, the required sag allowance for a particular amount of elongation is shown in Fig. 15.4. The drive centers should be adjusted periodically to maintain sag at 2 to 3 percent of the center distance. Idlers. When the center distance is long, the drive centers are near vertical, the center distance is fixed, or machine members obstruct the normal chain path, idler
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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