2) You want to make this involute gear. How should you make it? Hobbing or shaping? O 3) Skylab was the first US space station. It was built from the 3rd stage of a Saturn V rocket. It was launched by a special variant of the Saturn V rocket consisting of only the first and second stages. Item Skylab 1st 2nd Dry Mass 76,540 130,000 36,200 What delta V does the rocket impart to Skylab? Propellant N/A 2,150,000 443,000 Isp N/A 263 421 UNIT CONVERSIONS AND USEFUL TABLES: 1 lbm = 0.454 kg 1 in = 25.4 mm (this is an exact value) 1g 9.81 m/s 1 lbf = 4.448 N df 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 For example, the t value for 18 degrees of freedom is 2.101 for 95% confidence interval (2-Tail a=0.05). 90% 80% 0.100 95% 90% 0.050 0.10 0.10 v.20 0.20 Student's t Distribution Table 99% 99.5% 99.95% 98% 99.9% 99% 0.005 0.010 0.0005 0.02 0.01 0.001 3.0777 6.3138 12.7062 31.8205 63.6567 636.6192 1.8856 2.9200 6.9646 9.9248 31.5991 4.3027 3.1824 1.6377 2.3534 4.5407 5.8409 12.9240 1.5332 2.1318 2.7764 3.7469 4.6041 8.6103 3.3649 4.0321 6.8688 2.0150 1.9432 1.4149 1.8946 2.3646 1.4759 1.4398 2.5706 2.4469 3.1427 3.7074 5.9588 2.9980 3.4995 5.4079 1.3968 1.8595 2.3060 2.8965 3.3554 5.0413 2.2622 2.8214 3.2498 4.7809 2.2281 2.7638 3.1693 4.5869 1.3830 1.8331 1.3722 1.8125 1.3634 1.7959 2.2010 2.7181 3.1058 4.4370 3.0545 4.3178 1.3562 1.7823 2.1788 2.6810 1.3502 1.7709 2.1604 2.6503 3.0123 4.2208 1.3450 1.7613 2.1448 2.6245 2.9768 4.1405 1.3406 1.7531 2.1314 2.6025 2.9467 4.0728 1.3368 1.7459 2.1199 2.5835 2.9208 4.0150 3.9651 1.3334 1.7396 2.1098 2.5669 2.8982 2.1009 2.5524 2.8784 3.9216 2.0930 2.5395 2.8609 3.8834 2.0860 2.8453 3.8495 1.3304 1.7341 1.3277 1.7291 1.3253 1.7247 1.3232 1.7207 1.3212 1.7171 1.3195 1.7139 1.3178 1.7109 1.3163 1.7081 1.3150 1.7056 1.3137 1.7033 1.3125 1.7011 1.3114 1.6991 1.3104 1.6973 97.5% 95% 0.025 0.05 0:05 = 0.025 1 2.0796 2.0739 1 2.5280 2.5176 2.5083 2.4999 2.0687 2.0639 2.4922 2.7969 2.0595 2.4851 2.7874 3.7251 2.0555 2.4786 2.7787 3.7066 2.0518 2.4727 2.7707 3.6896 2.0484 2.4671 2.7633 3.6739 2.0452 2.4620 2.7564 3.6594 2.0423 2.4573 2.7500 3.6460 2.8314 2.8188 3.8193 3.7921 2.8073 3.7676 3.7454 = 0.025 tvalue 1-Tail Confidence Level 2-Tail Confidence Level 1-Tail Alpha 2-Tail Alpha 1 LEWIS FACTOR - Y NO. OF TEETH 10 11213141516718192022 24 26 28 30 32 34 ****4**8*R*===:88 36 38 40 45 50 55 60 65 70 75 80 90 100 150 200 300 RACK 14 1/2 20 INVOLUTE INVOLUTE 0.176 0.192 0.210 0.223 0.236 0.245 0.255 0.264 0.270 0.277 0.283 0.292 0.302 0.308 0.314 0.318 0.322 0.325 0.329 0.332 0.336 0.340 0.346 0.352 0.355 0.358 0.360 0.361 0.363 0.366 0.368 0.375 0.378 0.382 0.390 0.201 0.226 0.245 0.264 0.276 0.289 0.295 0.302 0.308 0.314 0.320 0.330 0.337 0.344 0.352 0.358 0.364 0.370 0.377 0.383 0.389 0.399 0.408 0.415 0.421 0.425 0.429 0.433 0.436 0.442 0.446 0.458 0.463 0.471 0.484