Machinery's Handbook, 31st Edition
CHECKING GEAR SIZES 2301 pitch, figure at left of decimal point = given No. of teeth + 2 = 335 + 2 = 337. Figure at right of decimal point lies between decimal values given in table for 301 and 401 teeth. Thus, 335 − 301 = 34 (change to 0.34); 0.4565 − 0.4538 = 0.0027; hence, decimal required = 0.4538 + (0.34 × 0.0027) = 0.4547. Total dimension = 337.4547. Table 1. Checking External Spur Gear Sizes by Measurement Over 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. 1.728 Wire or pin diameter = Diametral Pitch No. of Teeth Pressure Angle 14 1 ∕ 2 ° 17 1 ∕ 2 ° 20 ° 25 ° 30 ° 6 8.2846 8.2927 8.3032 8.3340 8.3759 8 10.3160 10.3196 10.3271 10.3533 10.3919 10 12.3399 12.3396 12.3445 12.3667 12.4028 12 14.3590 14.3552 14.3578 14.3768 14.4108 14 16.3746 16.3677 16.3683 16.3846 16.4169 16 18.3877 18.3780 18.3768 18.3908 18.4217 18 20.3989 20.3866 20.3840 20.3959 20.4256 20 22.4087 22.3940 22.3900 22.4002 22.4288 22 24.4172 24.4004 24.3952 24.4038 24.4315 24 26.4247 26.4060 26.3997 26.4069 26.4339 26 28.4314 28.4110 28.4036 28.4096 28.4358 28 30.4374 30.4154 30.4071 30.4120 30.4376 30 32.4429 32.4193 32.4102 32.4141 32.4391 32 34.4478 34.4228 34.4130 34.4159 34.4405 34 36.4523 36.4260 36.4155 36.4176 36.4417 36 38.4565 38.4290 38.4178 38.4191 38.4428 38 40.4603 40.4317 40.4198 40.4205 40.4438 40 42.4638 42.4341 42.4217 42.4217 42.4447 42 44.4671 44.4364 44.4234 44.4228 44.4455 44 46.4701 46.4385 46.4250 46.4239 46.4463 46 48.4729 48.4404 48.4265 48.4248 48.4470 48 50.4756 50.4422 50.4279 50.4257 50.4476 50 52.4781 52.4439 52.4292 52.4265 52.4482 52 54.4804 54.4454 54.4304 54.4273 54.4487 54 56.4826 56.4469 56.4315 56.4280 56.4492 56 58.4847 58.4483 58.4325 58.4287 58.4497 58 60.4866 60.4496 60.4335 60.4293 60.4501 60 62.4884 62.4509 62.4344 62.4299 62.4506 62 64.4902 64.4520 64.4352 64.4304 64.4510 64 66.4918 66.4531 66.4361 66.4309 66.4513 66 68.4933 68.4542 68.4369 68.4314 68.4517 68 70.4948 70.4552 70.4376 70.4319 70.4520 70 72.4963 72.4561 72.4383 72.4323 72.4523 72 74.4977 74.4570 74.4390 74.4327 74.4526 74 76.4990 76.4578 76.4396 76.4331 76.4529 76 78.5002 78.4586 78.4402 78.4335 78.4532 78 80.5014 80.4594 80.4408 80.4339 80.4534 80 82.5026 82.4601 82.4413 82.4342 82.4536 82 84.5037 84.4608 84.4418 84.4345 84.4538 84 86.5047 86.4615 86.4423 86.4348 86.4540 86 88.5057 88.4621 88.4428 88.4351 88.4542 88 90.5067 90.4627 90.4433 90.4354 90.4544
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