Machinery's Handbook, 31st Edition
CHECKING GEAR SIZES
2303
Table 2. Checking External Spur Gear Sizes by Measurement Over Wires ODD 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 1.728 = No. of Teeth Pressure Angle 14 1 ∕ 2 ° 17 1 ∕ 2 ° 20 ° 25 ° 30 ° 7 9.1116 9.1172 9.1260 9.1536 9.1928 9 11.1829 11.1844 11.1905 11.2142 11.2509 11 13.2317 13.2296 13.2332 13.2536 13.2882 13 15.2677 15.2617 15.2639 15.2814 15.3142 15 17.2957 17.2873 17.2871 17.3021 17.3329 17 19.3182 19.3072 19.3053 19.3181 19.3482 19 21.3368 21.3233 21.3200 21.3310 21.3600 21 23.3524 23.3368 23.3321 23.3415 23.3696 23 25.3658 25.3481 25.3423 25.3502 25.3775 25 27.3774 27.3579 27.3511 27.3576 27.3842 27 29.3876 29.3664 29.3586 29.3640 29.3899 29 31.3966 31.3738 31.3652 31.3695 31.3948 31 33.4047 33.3804 33.3710 33.3743 33.3991 33 35.4119 35.3863 35.3761 35.3786 35.4029 35 37.4185 37.3916 37.3807 37.3824 37.4063 37 39.4245 39.3964 39.3849 39.3858 39.4094 39 41.4299 41.4007 41.3886 41.3889 41.4120 41 43.4348 43.4047 43.3920 43.3917 43.4145 43 45.4394 45.4083 45.3951 45.3942 45.4168 45 47.4437 47.4116 47.3980 47.3965 47.4188 47 49.4477 49.4147 49.4007 49.3986 49.4206 49 51.4514 51.4175 51.4031 51.4006 51.4223 51 53.4547 53.4202 53.4053 53.4024 53.4239 53 55.4579 55.4227 55.4074 55.4041 55.4254 55 57.4609 57.4249 57.4093 57.4056 57.4267 57 59.4637 59.4271 59.4111 59.4071 59.4280 59 61.4664 61.4291 61.4128 61.4084 61.4292 61 63.4689 63.4310 63.4144 63.4097 63.4303 63 65.4712 65.4328 65.4159 65.4109 65.4313 65 67.4734 67.4344 67.4173 67.4120 67.4323 67 69.4755 69.4360 69.4186 69.4130 69.4332 69 71.4775 71.4375 71.4198 71.4140 71.4341 71 73.4795 73.4389 73.4210 73.4150 73.4349 73 75.4813 75.4403 75.4221 75.4159 75.4357 75 77.4830 77.4416 77.4232 77.4167 77.4364 77 79.4847 79.4428 79.4242 79.4175 79.4371 79 81.4863 81.4440 81.4252 81.4183 81.4378 81 83.4877 83.4451 83.4262 83.4190 83.4384 83 85.4892 85.4462 85.4271 85.4196 85.4390 85 87.4906 87.4472 87.4279 87.4203 87.4395 87 89.4919 89.4481 89.4287 89.4209 89.4400 89 91.4932 91.4490 91.4295 91.4215 91.4405 91 93.4944 93.4499 93.4303 93.4221 93.4410 93 95.4956 95.4508 95.4310 95.4227 95.4415
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