CHECKING GEAR SIZES Table 8. Checking External Spur Gear Sizes by Measurement Over Wires ODD NUMBERS OF TEETH Dimensions in table are for 1 diametral pitch and 1.68-inch series wire sizes (a Van Keuren standard). For any other diametral pitch, divide dimension in table by given pitch. Wire or pin diameter Diametral Pitch 1.68 = No. of Teeth Pressure Angle 14 1 ∕ 2 ° 17 1 ∕ 2 ° 20 ° 25 ° 30 ° 5 6.8485 6.8639 6.8800 6.9202 6.9691 7 8.9555 8.9679 8.9822 9.0199 9.0675 9 11.0189 11.0285 11.0410 11.0762 11.1224 11 13.0615 13.0686 13.0795 13.1126 13.1575 13 15.0925 15.0973 15.1068 15.1381 15.1819 15 17.1163 17.1190 17.1273 17.1570 17.1998 17 19.1351 19.1360 19.1432 19.1716 19.2136 19 21.1505 21.1498 21.1561 21.1832 21.2245 21 23.1634 23.1611 23.1665 23.1926 23.2334 23 25.1743 25.1707 25.1754 25.2005 25.2408 25 27.1836 27.1788 27.1828 27.2071 27.2469 27 29.1918 29.1859 29.1892 29.2128 29.2522 29 31.1990 31.1920 31.1948 31.2177 31.2568 31 33.2053 33.1974 33.1997 33.2220 33.2607 33 35.2110 35.2021 35.2041 35.2258 35.2642 35 37.2161 37.2065 37.2079 37.2292 37.2674 37 39.2208 39.2104 39.2115 39.2323 39.2702 39 41.2249 41.2138 41.2147 41.2349 41.2726 41 43.2287 43.2170 43.2174 43.2374 43.2749 43 45.2323 45.2199 45.2200 45.2396 45.2769 45 47.2355 47.2226 47.2224 47.2417 47.2788 47 49.2385 49.2251 49.2246 49.2435 49.2805 49 51.2413 51.2273 51.2266 51.2452 51.2820 51 53.2439 53.2294 53.2284 53.2468 53.2835 53 55.2463 55.2313 55.2302 55.2483 55.2848 55 57.2485 57.2331 57.2318 57.2497 57.2861 57 59.2506 59.2348 59.2333 59.2509 59.2872 59 61.2526 61.2363 61.2347 61.2521 61.2883 61 63.2545 63.2378 63.2360 63.2532 63.2893 63 65.2562 65.2392 65.2372 65.2543 65.2902 65 67.2579 67.2406 67.2383 67.2553 67.2911 67 69.2594 69.2419 69.2394 69.2562 69.2920 69 71.2609 71.2431 71.2405 71.2571 71.2928 71 73.2623 73.2442 73.2414 73.2579 73.2935 73 75.2636 75.2452 75.2423 75.2586 75.2942 75 77.2649 77.2462 77.2432 77.2594 77.2949 77 79.2661 79.2472 79.2440 79.2601 79.2955 79 81.2673 81.2481 81.2448 81.2607 81.2961 81 83.2684 83.2490 83.2456 83.2614 83.2967 83 85.2694 85.2498 85.2463 85.2620 85.2972 85 87.2704 87.2506 87.2470 87.2625 87.2977 87 89.2714 89.2514 89.2476 89.2631 89.2982 89 91.2723 91.2521 91.2482 91.2636 91.2987 91 93.2732 93.2528 93.2489 93.2641 93.2991 93 95.2741 95.2534 95.2494 95.2646 95.2996 Machinery's Handbook, 31st Edition
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