A stick deodorant package utilizes a screw to advance and retract the stick. The thumb wheel...

 

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A stick deodorant package utilizes a screw to advance and retract the stick. The thumb wheel rotates a standard 1/4-20 thread that moves the nut and deodorant stick. Determine the distance that the stick advances when the thumb wheel is rotated 3 revolutions. Hint. Table 12.1 below is needed to solve this problem. TABLE 12.1 Standard Unified Thread Dimensions Size 0 1 2 3 5 6 10 12 /16 7/16 /2 %/16 1 1 1 13% 2 Nominal Major Diameter (in.) 0.0600 0.0730 0.0860 0.0990 0.1120 0.1250 0.1380 0.1640 0.1900 0.2160 0.2500 0.3125 0.3750 0.4375 0.5000 0.5625 0.6250 0.7500 0.8750 1.0000 1.2500 1.5000 1.7500 2.0000 Coarse Threads Threads per inch, 11 64 56 48 40 40 32 32 24 24 20 18 16 14 13 12 11 10 7 6 5 4 Pitch (in.) P 0.0156 0.0179 0.0208 0.0250 0.0250 0.0313 0.0313 0.0417 0.0417 0.0500 0.0556 0.0625 0.0714 0.0769 0.0833 0.0909 0.1000 0.1111 0.1250 0.1429 0.1667 0.2000 0.2222 Nominal Pitch Diameter (in.) 0.0629 0.0744 0.0855 0.0958 0.1088 0.1177 0.1437 0.1629 0.1889 0.2175 0.2764 0.3344 0.3911 0.4500 0.5084 0.5660 0.6850 0.8028 0.9188 1.1572 1.3917 1.6201 1.8557 Fine Threads Threads per inch, 12 80 72 64 56 48 44 40 36 32 28 28 24 24 20 20 18 18 16 14 12 12 12 Pitch (in.) P 0.0125 0.0139 0.0156 0.0179 0.0208 0.0227 0.0250 0.0278 0.0313 0.0357 0.0357 0.0417 0.0417 0.0500 0.0500 0.0556 0.0556 0.0625 0.0714 0.0833 0.0833 0.0833 Nominal Pitch Diameter (in.) 0.0519 0.0640 0.0759 0.0874 0.0985 0.1102 0.1218 0.1460 0.1697 0.1928 0.2268 0.2854 0.3479 0.4050 0.4675 0.5264 0.5889 0.7094 0.8286 0.9459 1.1959 1.4459 Problem 09 Compute the lead, and lead angle, of a 1/4 -20 UNC thread. Also, determine whether it is self- locking when the thread is of general machined quality. Hint. For general machined screws with ordinary surfaces, the coefficient of friction of the nut-thread? is 0.20 A stick deodorant package utilizes a screw to advance and retract the stick. The thumb wheel rotates a standard 1/4-20 thread that moves the nut and deodorant stick. Determine the distance that the stick advances when the thumb wheel is rotated 3 revolutions. Hint. Table 12.1 below is needed to solve this problem. TABLE 12.1 Standard Unified Thread Dimensions Size 0 1 2 3 5 6 10 12 /16 7/16 /2 %/16 1 1 1 13% 2 Nominal Major Diameter (in.) 0.0600 0.0730 0.0860 0.0990 0.1120 0.1250 0.1380 0.1640 0.1900 0.2160 0.2500 0.3125 0.3750 0.4375 0.5000 0.5625 0.6250 0.7500 0.8750 1.0000 1.2500 1.5000 1.7500 2.0000 Coarse Threads Threads per inch, 11 64 56 48 40 40 32 32 24 24 20 18 16 14 13 12 11 10 7 6 5 4 Pitch (in.) P 0.0156 0.0179 0.0208 0.0250 0.0250 0.0313 0.0313 0.0417 0.0417 0.0500 0.0556 0.0625 0.0714 0.0769 0.0833 0.0909 0.1000 0.1111 0.1250 0.1429 0.1667 0.2000 0.2222 Nominal Pitch Diameter (in.) 0.0629 0.0744 0.0855 0.0958 0.1088 0.1177 0.1437 0.1629 0.1889 0.2175 0.2764 0.3344 0.3911 0.4500 0.5084 0.5660 0.6850 0.8028 0.9188 1.1572 1.3917 1.6201 1.8557 Fine Threads Threads per inch, 12 80 72 64 56 48 44 40 36 32 28 28 24 24 20 20 18 18 16 14 12 12 12 Pitch (in.) P 0.0125 0.0139 0.0156 0.0179 0.0208 0.0227 0.0250 0.0278 0.0313 0.0357 0.0357 0.0417 0.0417 0.0500 0.0500 0.0556 0.0556 0.0625 0.0714 0.0833 0.0833 0.0833 Nominal Pitch Diameter (in.) 0.0519 0.0640 0.0759 0.0874 0.0985 0.1102 0.1218 0.1460 0.1697 0.1928 0.2268 0.2854 0.3479 0.4050 0.4675 0.5264 0.5889 0.7094 0.8286 0.9459 1.1959 1.4459 Problem 09 Compute the lead, and lead angle, of a 1/4 -20 UNC thread. Also, determine whether it is self- locking when the thread is of general machined quality. Hint. For general machined screws with ordinary surfaces, the coefficient of friction of the nut-thread? is 0.20