Machinery''''s Handbook 2th Episode 4 Part 8 docx

SILENT OF INVERTED TOOTH CHAIN 2955 Table 4b. Over-Pin Diameter Tolerances for ANSI 3 ⁄ 16 - in. Pitch and Larger Silent Chain Sprocket Measurement (ANSI B29.2M-1982, R1987) Pitch Number of Teeth Up to 15 16 - 24 25 - 35 36 - 48 49 - 63 64 - 80 81 - 99 100 - 120 121- 143 144 up Tolerances, a Inches a All tolerances are negative. 0.1875 0.004 0.004 0.004 0.004 0.004 0.005 0.005 0.005 0.005 0.005 Tolerances, a Millimerers 4.76 0.10 0.10 0.10 0.10 0.10 0.13 0.13 0.13 0.13 0.13 Grooving tool may be either square or round end but groove must be full width down to diam- eter of G. For values of G (max.) see footnote to Table 3a Values of H (± 0.003 in.) = 0.051 in. are given only for chain numbers SC302 and SC402. M = Max. overall width of chain. The maximum radius over a new chain engaged on a sprocket will not exceed the sprocket pitch radius plus 75 per cent of the chain pitch. To obtain the chain widths and sprocket face dimensions in millimeters, multiply each entry by 25.4. Machinery's Handbook 27th Edition Copyright 2004, Industrial Press, Inc., New York, NY 2956 SILENT OF INVERTED TOOTH CHAIN Table 4c. ANSI 3 ⁄ 8 - in. Pitch and Larger Silent Chain Widths and Sprocket Face Dimensions (ANSI B29.2M-1982, R1987) Chain No Chain Pitch Type M a Max. A C ±0.005 D ±0.010 F +0.125 −0.000 R ±0.003 W +0.010 −0.000 SC302 0.375 Side Guide b 0.594 0.133 ……0.200 0.410 SC303 Center Guide 0.844 0.100 … 0.750 … SC304 1.094 … 1.000 … SC305 1.344 … 1.250 … SC306 1.594 … 1.500 … SC307 1.844 … 1.750 … SC308 2.094 … 2.000 … SC309 2.344 … 2.250 … SC310 2.594 … 2.500 … SC312 Double- Guide 3.094 1.000 3.000 … SC316 4.094 4.000 … SC320 5.094 5.000 … SC324 6.094 6.000 … SC402 0.500 Side Guide b 0.750 0.133 …… 0.200 0.410 SC403 Center Guide 0.875 0.100 … 0.750 … SC404 1.125 … 1.000 … SC405 1.375 … 1.250 … SC406 1.625 … 1.500 … SC407 1.875 … 1.750 … SC408 2.125 … 2.000 … SC409 2.375 … 2.250 … SC410 2.625 … 2.500 … SC411 2.875 … 2.750 … SC412 3.125 … 3.000 … SC414 3.625 … 3.500 … SC416 Double- Guide 4.125 1.000 4.000 … SC420 5.125 5.000 … SC424 6.125 6.000 … SC432 8.125 8.000 … SC504 0.625 Center- Guide 1.156 0.177 0.125 … 1.000 0.250 … SC505 1.406 … 1.250 … SC506 1.656 1.500 … SC507 1.906 1.750 … SC508 2.156 2.000 … SC510 2.656 2.500 … SC512 3.156 3.000 … SC516 4.156 4.000 … SC520 Double- Guide 5.156 2.000 5.000 … SC524 6.156 6.000 … SC528 7.156 7.000 … SC532 8.156 8.000 … SC540 10.156 10.000 … Machinery's Handbook 27th Edition Copyright 2004, Industrial Press, Inc., New York, NY SILENT OF INVERTED TOOTH CHAIN 2957 SC604 0.750 Center- Guide 1.187 0.274 0.180 … 1.000 0.360 … SC605 1.437 … 1.250 … SC606 1.687 … 1.500 … SC608 2.187 … 2.000 … SC610 2.687 … 2.500 … SC612 3.187 … 3.000 … SC614 3.687 … 3.500 … SC616 4.187 … 4.000 … SC620 5.187 … 5.000 … SC624 6.187 4.000 6.000 … SC628 Double guide 7.187 7.000 … SC632 8.187 8.000 … SC636 9.187 9.000 … SC640 10.187 10.000 … SC648 12.187 12.000 … SC808 1.000 Center Guide 2.250 0.177 0.125 … 2.000 0.250 … SC810 2.750 … 2.500 … SC812 3.250 … 3.000 … SC816 4.250 … 4.000 … SC820 5.250 … 5.000 … SC824 6.250 … 6.000 … SC828 7.250 … 7.000 … SC832 Double guide 8.250 … 8.000 … SC836 9.250 2.000 9.000 … SC840 10.250 10.000 … SC848 12.250 12.000 … SC856 14.250 14.000 … SC864 16.250 16.000 … SC1010 1.25 Center Guide 2.812 0.274 0.180 … 2.500 0.360 … SC1012 3.312 … 3.000 … SC1016 4.312 … 4.000 … SC1020 5.312 … 5.000 … SC1024 6.312 … 6.000 … SC1028 7.312 … 7.000 … SC1032 Double guide 8.312 4.000 8.000 … SC1036 9.312 9.000 … SC1040 10.312 10.000 … SC1048 12.312 12.000 … SC1056 14.312 14.000 … SC1064 16.312 16.000 … SC1072 18.312 18.000 … SC1080 20.312 20.000 … Table 4c. (Continued) ANSI 3 ⁄ 8 - in. Pitch and Larger Silent Chain Widths and Sprocket Face Dimensions (ANSI B29.2M-1982, R1987) Chain No Chain Pitch Type M a Max. A C ±0.005 D ±0.010 F +0.125 −0.000 R ±0.003 W +0.010 −0.000 Machinery's Handbook 27th Edition Copyright 2004, Industrial Press, Inc., New York, NY 2958 SILENT OF INVERTED TOOTH CHAIN All dimensions in inches. M Max. overall width of chain. SC1212 1.500 Center Guide 3.375 0.274 0.180 … 3.000 0.360 … SC1216 4.375 … 4.000 … SC1220 5.375 … 5.000 … SC1224 6.375 … 6.000 … SC1228 7.375 … 7.000 … SC1232 Double guide 8.375 … 8.000 … SC1236 9.375 4.000 9.000 … SC1240 10.375 10.000 … SC1248 12.375 12.000 … SC1256 14.375 14.000 … SC1264 16.375 16.000 … SC1272 18.375 18.000 … SC1280 20.375 20.000 … SC1288 22.375 22.000 … SC1296 24.375 24.000 … SC1616 2.000 Center Guide 4.500 0.274 0.218 … 4.000 0.360 … SC1620 5.500 … 5.000 … SC1624 6.500 … 6.000 … SC1628 7.500 4.000 7.000 … SC1632 Double guide 8.500 8.000 … SC1640 10.500 10.000 … SC1648 12.500 12.000 … SC1656 14.500 14.000 … SC1664 16.500 16.000 … SC1672 18.500 18.000 … SC1680 20.500 20.000 … SC1688 22.500 22.000 … SC1696 24.500 24.000 … SC16120 30.500 30.000 … a Specify side guide or center guide type. b Side Guide chains have single outside guides of same thickness as toothed links. Table 4c. (Continued) ANSI 3 ⁄ 8 - in. Pitch and Larger Silent Chain Widths and Sprocket Face Dimensions (ANSI B29.2M-1982, R1987) Chain No Chain Pitch Type M a Max. A C ±0.005 D ±0.010 F +0.125 −0.000 R ±0.003 W +0.010 −0.000 Machinery's Handbook 27th Edition Copyright 2004, Industrial Press, Inc., New York, NY SILENT OF INVERTED TOOTH CHAIN 2959 All dimensions in inches. M = Max. overall width of chain. To obtain chain width and sprocket face dimensions in millimeters, multiply each entry by 25.4. Sprocket Hub Dimensions.—The important hub dimensions are the outside diameter, the bore, and the length. The maximum hub diameter is limited by the need to clear the chain guides and is of particular importance for sprockets with low numbers of teeth. The American National Standard for inverted tooth chains and sprocket teeth ANSI B29.2M- 1982 (R1987) provides the following formulas for calculating maximum hub diameters, MHD. Table 4d. American National Standard 3 ⁄ 16 - in. Pitch and Larger Silent Chain Widths and Sprocket Face Dimensions ANSI B29.2M-1982,1987 Values of H = 0.025 in. are given for chain numbers SC0305 through SC0315. Chain No Chain Pitch Type M Max. A C Max. F Min. RW ±0.003 SC0305 0.1875 Side Guide 0.216 0.06 … 0.09 0.075 SC0307 0.278 … 0.138 SC0309 0.341 … 0.201 SC0311 Side Guide/ Center Guide 0.403 0.050 0.334 0.264 SC0313 0.466 0.396 0.327 SC0315 0.528 0.459 0.390 SC0317 Center Guide 0.591 0.521 … SC0319 0.653 0.584 … SC0321 0.716 0.646 … SC0323 0.778 0.709 … SC0325 0.850 0.771 … SC0327 0.903 0.834 SC0329 0.966 0.896 … SC0331 1.028 0.959 … MHD(for hobbed teeth) P 180° N ⎝⎠ ⎛⎞ cot 1.33–= MHD(for stradle cut teeth) P 180° N ⎝⎠ ⎛⎞ cot 1.25–= Machinery's Handbook 27th Edition Copyright 2004, Industrial Press, Inc., New York, NY 2960 SILENT OF INVERTED TOOTH CHAIN Maximum hub diameters for sprockets with from 17 to 31 teeth are given in Table 5. Maximum hub diameters for other methods of cutting teeth may differ from thesevalues. Recommended maximum bores are given in Table 6. Table 5. American National Standard Minimum Hub Diameters for Silent chain Sprockets (17 to 31 Teeth) ANSI B29.2M-1982,1987 All dimensions in inches. Values shown are 1-inch pitch chain. For other pitches ( 3 ⁄ 8 - inch and larger) multiply the values given by the pitch. Good practice indicates that teeth of sprockets up to and including 31 teeth should have a Rockwell hardness of C50 min. Table 6. Recommended maximum Sprocket Bores for Silent Chains American Chain Association. No. Teeth Hob cut Straddle Cut No. Teeth Hob cut Straddle Cut No. Teeth Hob cut Straddle Cut Min. Hub Diam. Min. Hub Diam. Min. Hub Diam. 17 4.019 4.099 22 5.626 5.706 27 7.226 7.306 18 4.341 4.421 23 5.946 6.026 28 7.546 7.626 19 4.662 4.742 24 6.265 6.345 29 7.865 7.945 20 4.983 5.063 25 6.586 6.666 30 8.185 8.265 21 5.304 5.384 26 6.905 6.985 31 8.503 8.583 Number of Teeth Chain Pitch, Inches 3 ⁄ 8 1 ⁄ 2 5 ⁄ 8 3 ⁄ 4 1 1 1 ⁄ 4 1 1 ⁄ 2 2 Maximum Sprocket Bore. Inches 17 1 1 3 ⁄ 8 1 3 ⁄ 4 2 2 3 ⁄ 4 3 3 ⁄ 8 4 1 ⁄ 8 5 1 ⁄ 4 19 1 1 ⁄ 4 1 5 ⁄ 8 2 2 3 ⁄ 8 3 1 ⁄ 4 4 4 7 ⁄ 8 6 3 ⁄ 4 21 1 3 ⁄ 8 1 7 ⁄ 8 2 1 ⁄ 4 2 3 ⁄ 4 3 3 ⁄ 4 4 1 ⁄ 2 5 1 ⁄ 2 7 3 ⁄ 4 23 1 5 ⁄ 8 2 1 ⁄ 8 2 5 ⁄ 8 3 1 ⁄ 4 4 3 ⁄ 8 5 1 ⁄ 2 6 1 ⁄ 2 9 25 1 3 ⁄ 4 2 3 ⁄ 8 3 3 5 ⁄ 8 4 3 ⁄ 4 6 7 1 ⁄ 4 10 27 2 2 5 ⁄ 8 3 3 ⁄ 8 3 7 ⁄ 8 5 3 ⁄ 8 6 3 ⁄ 4 8 1 ⁄ 8 11 1 ⁄ 4 29 2 1 ⁄ 8 2 13 ⁄ 16 3 5 ⁄ 8 4 3 ⁄ 8 5 3 ⁄ 4 7 3 ⁄ 8 9 1 ⁄ 8 12 1 ⁄ 4 31 2 5 ⁄ 16 3 1 ⁄ 16 3 7 ⁄ 8 4 5 ⁄ 8 6 3 ⁄ 8 8 9 7 ⁄ 8 13 1 ⁄ 4 Machinery's Handbook 27th Edition Copyright 2004, Industrial Press, Inc., New York, NY SILENT OF INVERTED TOOTH CHAIN 2961 Table 7a. Tooth Form for ANSI 3 ⁄ 8 - inch and larger Silent Tooth Sprocket ANSI B29.2M-1982, R1987 Table 7b. Tooth Form for ANSI 3 ⁄ 16 - inch and larger Silent Tooth Sprocket ANSI B29.2M-1982, R1987 P = Chain Pitch N = Number of Teeth E = Diameter to Center of Topping Curve B = Diameter to Base of Working Face EP 180° N cot 0.22– ⎝⎠ ⎛⎞ = BP1.515213 180° N cot 1.1– ⎝⎠ ⎛⎞ 2 += Machinery's Handbook 27th Edition Copyright 2004, Industrial Press, Inc., New York, NY 2962 SILENT OF INVERTED TOOTH CHAIN Table 8. Straddle Cutters for American National Standard 3 ⁄ 8 - in. Pitch and Larger Silent Chain Sprocket Teeth All dimensions in inches. To obtain values in millimeters, multiply inch values by 25.4. These data are given as supplementary information in ANSI B29.2M-1982, R1987 and are made available by the American Chain Association. Fig. 3. Identification of Inverted Tooth Chain Hobs. Chain Pitch P Mark Cutter a a Range of teeth is indicated in the cutter marking. Outside Diam. 0.75P αθBore b b Suggested standard. Bores other than standard must be specified. 0.375 SC3-15 thru 35 SC3-36 up 3.625 0.2813 22°-30′ 27°-30′ 12° 5° 1.250 0.500 SC4-15 thru 35 SC4-36 up 3.875 0.3750 22°-30′ 27°-30′ 12° 5° 1.250 0.625 SC5-15 thru 35 SC5-36 up 4.250 0.4688 22°-30′ 27°-30′ 2° 5° 1.250 0.750 SC6-15 thru 35 SC6-36 up 4.625 0.5625 22°-30′ 27°-30′ 12° 5° 1.250 1.000 SC8-15 thru 35 SC8-36 up 5.250 0.7500 22°-30′ 27°-30′ 12° 5° 1.500 1.250 SC10-15 thru 35 SC10-36 up 5.750 0.9375 22°-30′ 27°-30′ 12° 5° 1.500 1.500 SC12-15 thru 35 SC12-36 up 6.250 1.1250 22°-30′ 27°-30′ 12° 5° 1.750 2.000 SC16-15 thru 35 SC16-36 up 6.500 1.5000 22°-30′ 27°-30′ 12° 5° 1.750 Machinery's Handbook 27th Edition Copyright 2004, Industrial Press, Inc., New York, NY SILENT OF INVERTED TOOTH CHAIN 2963 Table 9. Hobs for ANSI 3 ⁄ 8 - inch and larger Silent Tooth Sprocket * Sprocket Design and Tooth Form.—Except for tooth form, silent chain sprocket design parallels the general design practice of roller chain sprockets as covered in the previous section. As shown in Tables 7a and 7b, sprockets for American National Standard silent chains have teeth with straight-line working faces. The tops of teeth for 3 ⁄ 8 -in. and larger pitch chains may be rounded or square. Bottom clearance below the working face is not speci- fied but must be sufficient to clear the chain teeth. The standard tooth form for 3 ⁄ 8 -in. and larger pitch chains is designed to mesh with link plate contours having an included angle of 60 degrees as shown in the diagram of Table 7a. The standard tooth form for 3 ⁄ 16 -in. pitch chains has an included angle of 70 degrees as shown in Table 7b. It will be seen from these tables that the angle between the faces of a given tooth [60°–720°/N for 3 ⁄ 8 -in. pitch and larger; 70°–720°/N for 3 ⁄ 16 -in. pitch] becomes smaller as the number of teeth decreases. Therefore, for a 3 ⁄ 8 -in. pitch or larger 12-tooth sprocket it will be zero. In other words the tooth faces will be parallel. For smaller tooth numbers the teeth would be undercut. For best results, 21 or more teeth are recommended; less than 17 should not be used. Cutting Silent Chain Sprocket Teeth.—Sprocket teeth may be cut by either a straddle cutter or a hob. Essential dimensions for straddle cutters are given in Table 8 and for hobs in Table 9 and 10. American National Standard silent chain hobs are stamped for identifi- cation as shown on page 2375. P = Chain Pitch N = Number of Teeth * Source: American Chain Association. HGD P 1 180° N sin 2 0.5625 1.5 30 180 N – ⎝⎠ ⎛⎞ ° sin 180° N sin –+= Machinery's Handbook 27th Edition Copyright 2004, Industrial Press, Inc., New York, NY [...]... −0.50) 14 17 21 26 35 55 135 I J I J I J I J I J I J I J 0. 080 0 .40 0. 14 0. 088 0 .41 0.17 0.097 0 .41 0.20 0.105 0 .41 0.23 0.116 0 .42 0.26 0.130 0 .42 0.30 0. 1 48 0 .43 0. 34 0. 080 0 .42 0. 18 0.090 0 .43 0.21 0.099 0 .43 0.23 0.111 0 .43 0.27 0.127 0 .44 0.31 0. 149 0 .44 0.35 0. 080 0 .44 0.21 0.090 0 .45 0. 24 0.103 0 .45 0.27 0.122 0 .45 0.31 0. 1 48 0 .46 0.36 0. 080 0 .46 0. 24 0.0 94 0 .46 0. 28 0.1 14 0 .47 0.32 0. 145 0 .47 0.37... 0.092 0. 080 0.37 0.32 0 .40 0.32 0 .41 0.33 0 .43 0. 34 0.115 0.113 0.1 08 0.099 0. 38 0.35 0 .40 0.36 0 .42 0.36 0 .44 0.37 0.131 0.1 34 0.133 0.129 0.39 0.39 0 .41 0 .40 0 .43 0 .41 0 .45 0 .42 50 percent Long Addendum Pinion (x1 = 0.50) 0. 080 0 .43 0 .43 0.112 0 .45 0 .47 0. 080 0 .49 0 .49 0. 080 0 .47 0.39 0.116 0 . 48 0 .44 0. 080 0.51 0 .46 0. 080 0.50 0. 34 0.120 0.50 0 .40 0. 080 0.52 0 .43 25 percent Short Addendum Gear (x2 =... 0.0 78 0.33 0.33 0.0 84 0.079 0.33 0.35 0.35 0.35 0.091 0. 088 0. 080 0. 34 0.37 0.36 0. 38 0.39 0.39 0.102 0.101 0.095 0. 34 0 .40 0.37 0 .41 0 .40 0 .42 0.1 18 0.121 0.120 0.35 0 .43 0. 38 0 .44 0 .41 0 .45 25 percent Long Addendum Pinion (x1 = 0.25) I J I J I J I J I J I J 0. 080 0.36 0. 24 0. 087 0. 080 0.37 0.26 0.39 0.27 0.0 94 0. 088 0. 080 0.37 0.29 0.39 0.29 0 .41 0.30 0.103 0.106 0.092 0. 080 0.37 0.32 0 .40 0.32 0 .41 ... 0 .45 0 .43 0 .46 0 .46 0 .46 0.119 0.121 0.119 0.112 0.095 0. 38 0 . 48 0 .41 0 .49 0 .43 0 .49 0 .47 0.50 0.51 0.51 0.132 0.139 0. 142 0. 141 0.131 0.096 0. 38 0.52 0 .42 0.53 0 .45 0.53 0 . 48 0. 54 0.53 0.56 0.57 0.57 25 percent Long Addendum Pinion (x1 = 0.25) 25 percent Short Addendum Gear (x2 = −0.25) 0.0 94 0 .43 0.29 0.102 0.095 0 .43 0.33 0 .46 0.33 0.109 0.103 0.095 0 .44 0.36 0 .46 0.36 0 . 48 0.37 0.119 0.115 0.1 08. .. 0.096 0 .44 0.39 0 .47 0 .40 0 .49 0 .41 0.51 0 .41 0.133 0.131 0.126 0.116 0 .44 0 .44 0 .47 0 .44 0 .49 0 .45 0.52 0 .46 0.151 0.153 0.153 0. 1 48 0 .45 0 .49 0 . 48 0 .49 0.50 0.50 0.53 0.51 50 percent Long Addendum Pinion (x1 = 0.50) 50 percent Short Addendum Gear (x2 = −0.50) 0.096 0.52 0.27 0.106 0.096 0.52 0.30 0.53 0.31 0.120 0.110 0.096 0.52 0.35 0.53 0.35 0.55 0.36 0.139 0.131 0.1 18 0.52 0 .40 0. 54 0 .41 0.56 0 .42 ... 0. 34 0. 34 0.36 0. 34 0.36 0. 34 0.37 0. 34 0.151 0.153 0.153 0. 1 48 0. 34 0.27 0.36 0.37 0.36 0.37 0.37 0.37 50 percent Long Addendum Pinion (x1 = 0.50) 50 percent Short Addendum Gear (x2 = −0.50) 0.096 0 .40 0.23 0.106 0.096 0 .40 0.25 0 .40 0.25 0.120 0.110 0.096 0 .40 0. 28 0 .40 0. 28 0 .40 0. 28 0.139 0.131 0.1 18 0 .40 0.32 0 .40 0.32 0 .40 0.32 0.167 0.163 0.155 0 .40 0.36 0 .40 0.36 0 .40 0.36 0.096 0. 38 0. 34 0.135... Teeth 14 17 21 26 35 55 135 14 17 21 26 35 55 135 21 26 35 55 135 12 P 14 G I J I J I J I J I J I J I J I J I J I J I J I J I J I J I J I J I J I J I J P G 0. 086 0.33 0.33 0.091 0.33 0.36 0.095 0.33 0.39 0.100 0.33 0 .41 0.106 0. 34 0 .44 0.113 0. 34 0 .47 0.123 0.35 0.51 0.095 0. 38 0.25 0.100 0. 38 0.29 0.106 0. 38 0.32 0.111 0.39 0.35 0.1 18 0.39 0. 38 0.127 0.39 0 .42 0.1 38 0 .40 0 .47 0.093 0 .40 0.25 0.099 0 .40 ... 0 .41 0.32 0.112 0 .41 0.35 0.120 0 .41 0.39 0.131 0 .42 0 .43 0. 145 0 .42 0 . 48 2.350 Whole Depth Factor 0.0 24 Tooth Thinning for Backlash Loaded at HPSTC of Gears Number of Pinion Teeth 17 21 26 35 55 P G P G P G P G P G Equal Addendum Coefficients (x1 = x2 = 0) 135 P G 0.090 0.36 0.36 0.096 0.092 0.36 0.39 0.39 0.39 0.101 0.099 0.0 94 0.37 0 .42 0 .40 0 .42 0 .43 0 .43 0.109 0.1 08 0.1 04 0.095 0.37 0 .45 0 .40 ... 0.30 0.36 0.31 0.36 0.33 0.36 0. 34 0.36 0.36 0.36 0.132 0.139 0. 142 0. 141 0.131 0.096 0.30 0. 38 0.31 0. 38 0.33 0. 38 0. 34 0. 38 0.36 0. 38 0 .49 0 .49 25 percent Long Addendum Pinion (x1 = 0.25) 25 percent Short Addendum Gear (x2 = −0.25) 0.0 94 0. 34 0.25 0.102 0.095 0. 34 0.27 0.36 0.27 0.109 0.103 0.095 0.095 0. 34 0.29 0.36 0.29 0.36 0.29 0.36 0.29 0.119 0.115 0.1 08 0.096 0. 34 0.31 0.36 0.31 0.36 0.31 0.37... Number of Gear Teeth 14 17 21 26 35 55 135 14 17 21 26 35 55 135 21 26 35 55 135 12 P 14 G I J I J I J I J I J I J I J I J I J I J I J I J I J I J I J I J I J I J I J P G 0. 086 0. 28 0. 28 0.091 0. 28 0.30 0.095 0. 28 0.31 0.100 0. 28 0.33 0.106 0. 28 0. 34 0.113 0. 28 0.36 0.123 0. 28 0. 38 0.095 0.32 0.22 0.100 0.32 0.25 0.106 0.32 0.27 0.111 0.32 0.29 0.1 18 0.32 0.31 0.127 0.32 0. 34 0.1 38 0.32 0.37 0.093 0.33 . 4. 019 4. 099 22 5.626 5.706 27 7.226 7.306 18 4. 341 4. 421 23 5. 946 6.026 28 7. 546 7.626 19 4. 662 4. 742 24 6.265 6. 345 29 7 .86 5 7. 945 20 4. 983 5.063 25 6. 586 6.666 30 8. 185 8. 265 21 5.3 04 5.3 84 . 1 1 3 ⁄ 8 1 3 ⁄ 4 2 2 3 ⁄ 4 3 3 ⁄ 8 4 1 ⁄ 8 5 1 ⁄ 4 19 1 1 ⁄ 4 1 5 ⁄ 8 2 2 3 ⁄ 8 3 1 ⁄ 4 4 4 7 ⁄ 8 6 3 ⁄ 4 21 1 3 ⁄ 8 1 7 ⁄ 8 2 1 ⁄ 4 2 3 ⁄ 4 3 3 ⁄ 4 4 1 ⁄ 2 5 1 ⁄ 2 7 3 ⁄ 4 23 1 5 ⁄ 8 2 1 ⁄ 8 2 5 ⁄ 8 3 1 ⁄ 4 4 3 ⁄ 8 5 1 ⁄ 2 6 1 ⁄ 2 9 25 1 3 ⁄ 4 2 3 ⁄ 8 3 3 5 ⁄ 8 4 3 ⁄ 4 6 7 1 ⁄ 4 10 27. 1 1 3 ⁄ 8 1 3 ⁄ 4 2 2 3 ⁄ 4 3 3 ⁄ 8 4 1 ⁄ 8 5 1 ⁄ 4 19 1 1 ⁄ 4 1 5 ⁄ 8 2 2 3 ⁄ 8 3 1 ⁄ 4 4 4 7 ⁄ 8 6 3 ⁄ 4 21 1 3 ⁄ 8 1 7 ⁄ 8 2 1 ⁄ 4 2 3 ⁄ 4 3 3 ⁄ 4 4 1 ⁄ 2 5 1 ⁄ 2 7 3 ⁄ 4 23 1 5 ⁄ 8 2 1 ⁄ 8 2 5 ⁄ 8 3 1 ⁄ 4 4 3 ⁄ 8 5 1 ⁄ 2 6 1 ⁄ 2 9 25 1 3 ⁄ 4 2 3 ⁄ 8 3 3 5 ⁄ 8 4 3 ⁄ 4 6 7 1 ⁄ 4 10 27 2 2 5 ⁄ 8 3 3 ⁄ 8 3 7 ⁄ 8 5 3 ⁄ 8 6 3 ⁄ 4 8 1 ⁄ 8 11 1 ⁄ 4 29 2 1 ⁄ 8 2 13 ⁄ 16 3 5 ⁄ 8 4 3 ⁄ 8 5 3 ⁄ 4 7 3 ⁄ 8 9 1 ⁄ 8 12 1 ⁄ 4 31 2 5 ⁄ 16 3 1 ⁄ 16 3 7 ⁄ 8 4 5 ⁄ 8 6 3 ⁄ 8 8 9 7 ⁄ 8 13 1 ⁄ 4 Machinery's