CHECKING GEAR SIZES Table 7. Checking External Spur Gear Sizes by Measurement Over Wires EVEN 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 ° 6 8.1298 8.1442 8.1600 8.2003 8.2504 8 10.1535 10.1647 10.1783 10.2155 10.2633 10 12.1712 12.1796 12.1914 12.2260 12.2722 12 14.1851 14.1910 14.2013 14.2338 14.2785 14 16.1964 16.2001 16.2091 16.2397 16.2833 16 18.2058 18.2076 18.2154 18.2445 18.2871 18 20.2137 20.2138 20.2205 20.2483 20.2902 20 22.2205 22.2190 22.2249 22.2515 22.2927 22 24.2265 24.2235 24.2286 24.2542 24.2949 24 26.2317 26.2275 26.2318 26.2566 26.2967 26 28.2363 28.2309 28.2346 28.2586 28.2982 28 30.2404 30.2339 30.2371 30.2603 30.2996 30 32.2441 32.2367 32.2392 32.2619 32.3008 32 34.2475 34.2391 34.2412 34.2632 34.3017 34 36.2505 36.2413 36.2430 36.2644 36.3026 36 38.2533 38.2433 38.2445 38.2655 38.3035 38 40.2558 40.2451 40.2460 40.2666 40.3044 40 42.2582 42.2468 42.2473 42.2675 42.3051 42 44.2604 44.2483 44.2485 44.2683 44.3057 44 46.2624 46.2497 46.2496 46.2690 46.3063 46 48.2642 48.2510 48.2506 48.2697 48.3068 48 50.2660 50.2522 50.2516 50.2704 50.3073 50 52.2676 52.2534 52.2525 52.2710 52.3078 52 54.2691 54.2545 54.2533 54.2716 54.3082 54 56.2705 56.2555 56.2541 56.2721 56.3086 56 58.2719 58.2564 58.2548 58.2726 58.3089 58 60.2731 60.2572 60.2555 60.2730 60.3093 60 62.2743 62.2580 62.2561 62.2735 62.3096 62 64.2755 64.2587 64.2567 64.2739 64.3099 64 66.2765 66.2594 66.2572 66.2742 66.3102 66 68.2775 68.2601 68.2577 68.2746 68.3104 68 70.2785 70.2608 70.2582 70.2749 70.3107 70 72.2794 72.2615 72.2587 72.2752 72.3109 72 74.2803 74.2620 74.2591 74.2755 74.3111 74 76.2811 76.2625 76.2596 76.2758 76.3113 76 78.2819 78.2631 78.2600 78.2761 78.3115 78 80.2827 80.2636 80.2604 80.2763 80.3117 80 82.2834 82.2641 82.2607 82.2766 82.3119 82 84.2841 84.2646 84.2611 84.2768 84.3121 84 86.2847 86.2650 86.2614 86.2771 86.3123 86 88.2854 88.2655 88.2617 88.2773 88.3124 88 90.2860 90.2659 90.2620 90.2775 90.3126 90 92.2866 92.2662 92.2624 92.2777 92.3127 92 94.2872 94.2666 94.2626 94.2779 94.3129 94 96.2877 96.2670 96.2629 96.2780 96.3130 96 98.2882 98.2673 98.2632 98.2782 98.3131 98 100.2887 100.2677 100.2635 100.2784 100.3132 100 102.2892 102.2680 102.2638 102.2785 102.3134 102 104.2897 104.2683 104.2640 104.2787 104.3135 Machinery's Handbook, 31st Edition
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