Machinery's Handbook, 31st Edition
CHECKING GEAR SIZES
2305
Table 3. Checking Internal Spur Gear Sizes by Measurement Between Wires EVEN NUMBERS OF TEETH Dimensions in table are for 1 diametral pitch and Van Keuren standard wire sizes. For any other diametral pitch, divide dimension in table by given pitch. Wire or pin diameter Diametral Pitch 1.44 = No. of Teeth Pressure Angle 14 1 ∕ 2 ° 17 1 ∕ 2 ° 20 ° 25 ° 30 ° 10 8.8337 8.7383 8.6617 8.5209 8.3966 12 10.8394 10.7404 10.6623 10.5210 10.3973 14 12.8438 12.7419 12.6627 12.5210 12.3978 16 14.8474 14.7431 14.6630 14.5210 14.3982 18 16.8504 16.7441 16.6633 16.5210 16.3985 20 18.8529 18.7449 18.6635 18.5211 18.3987 22 20.8550 20.7456 20.6636 20.5211 20.3989 24 22.8569 22.7462 22.6638 22.5211 22.3991 26 24.8585 24.7467 24.6639 24.5211 24.3992 28 26.8599 26.7471 26.6640 26.5211 26.3993 30 28.8612 28.7475 28.6641 28.5211 28.3994 32 30.8623 30.7478 30.6642 30.5211 30.3995 34 32.8633 32.7481 32.6642 32.5211 32.3995 36 34.8642 34.7483 34.6643 34.5212 34.3996 38 36.8650 36.7486 36.6642 36.5212 36.3996 40 38.8658 38.7488 38.6644 38.5212 38.3997 42 40.8665 40.7490 40.6644 40.5212 40.3997 44 42.8672 42.7492 42.6645 42.5212 42.3998 46 44.8678 44.7493 44.6645 44.5212 44.3998 48 46.8683 46.7495 46.6646 46.5212 46.3999 50 48.8688 48.7496 48.6646 48.5212 48.3999 52 50.8692 50.7497 50.6646 50.5212 50.3999 54 52.8697 52.7499 52.6647 52.5212 52.4000 56 54.8701 54.7500 54.6647 54.5212 54.4000 58 56.8705 56.7501 56.6648 56.5212 56.4001 60 58.8709 58.7502 58.6648 58.5212 58.4001 62 60.8712 60.7503 60.6648 60.5212 60.4001 64 62.8715 62.7504 62.6648 62.5212 62.4001 66 64.8718 64.7505 64.6649 64.5212 64.4001 68 66.8721 66.7505 66.6649 66.5212 66.4001 70 68.8724 68.7506 68.6649 68.5212 68.4001 72 70.8727 70.7507 70.6649 70.5212 70.4002 74 72.8729 72.7507 72.6649 72.5212 72.4002 76 74.8731 74.7508 74.6649 74.5212 74.4002 78 76.8734 76.7509 76.6649 76.5212 76.4002 80 78.8736 78.7509 78.6649 78.5212 78.4002 82 80.8738 80.7510 80.6649 80.5212 80.4002 84 82.8740 82.7510 82.6649 82.5212 82.4002 86 84.8742 84.7511 84.6650 84.5212 84.4002 88 86.8743 86.7511 86.6650 86.5212 86.4003 90 88.8745 88.7512 88.6650 88.5212 88.4003 92 90.8747 90.7512 90.6650 90.5212 90.4003 94 92.8749 92.7513 92.6650 92.5212 92.4003
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