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4.1 Mechanisms Test (30pts)

Approximate all answers to hundredths place when needed. You must show all formulas, units and SHOW WORK!

Use the following Image for the first 3 questions. '2~ 1. A. _--=J"-- __ Effort I I Effort Force K B. ----"1'-,1-~-+-- ~ ~ 1. Name the type of lever for each of the above diagrams. (1 pt each) c. b _

.2. Lever A uses an effort force of 30 Ibs.to overcome a resistance of 21 Ibs. Find the actual mechanical advantage if the distance of the resistance force is 12 feet. (1 pt)

2. ---,,._"__1

3. Assume lever B has a 501b resistance force and 151beffort force. If the lever's effort force is located 4ft from the fulcrum and it's resistance force is 1 foot from the fulcrum, what is the efficiency. (2 pts) 50 (b IS /10 ,{b~ ...... , ----~4 '-1

3.

4. An industrial water shutoff valve is designed to operate with a 25 Ib effort force at the wheel. The valve will. encounter 175 Ib of resistance force applied to a 1.5 in. diameter axle. What is the actual mechanical advantage of the system? (1 pt)

4. __ -'-- _ 5. What is the IMA of the Block and Tackle system to the right? (1 pt)

&, 5. _

6. If the efficiency of this Block and Tackle System is 85%. What is the Actual Mechanical Advantage of the system. (1 pt)

6. ~5_..-,--I _

7. Based on this Actual Mechanical Advantage How much effort force is needed to use this Pulley System to raise an object that weighs 320 Ibs. (1 pt)

7.

8. A wrench with a 11/2 inch handle is used to install a % 20 UNC bolt into a robotic arm. What is the pitch of the ? (1 pt)

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9. What is the ideal mechanical advantage ofthe above situation? (2 pts)

C "j...-rtr~ -.. :l-- 0;' ?--n /,5" XJl1J4::: z: ~ f P 126 9. I('t·~ 10. In the simple train to the right, A & B have 10 teeth, Gear C has 30. Using Gear A as the Input and C as the output, What is the mechanical advantage of the system? (1 pt)

10. 3 _

11. Is this geared for gaining torque or speed? (1 pt)

12. Gear B is an idler gear above, what is its unique purpose? (1 pt) 12. ()("IJ ()~5 Ii I Cl-op~ci~

A is (shown below) composed of four gears, A, B, C, and D. Gear A has 10 teeth and is meshed with gear B. Gear B has 20 teeth and shares a shaft with gear C, which has 16 teeth. Gear C is meshed with gear D, the output gear which has 40 teeth.

13. Find the gear ratio of the gear train (1 pt) fj P W Ltc> f -rl- a ~ " ~ z; .-. 0 .::--:; J 8 t·S- (ff f.l t- /D If,

13. 5 _

14. Describe why this is known as a compound gear train. (1 pt) 14. ~ -Ie '2 k.ue q P1 ~I~

The following diagram represents a chain and system. Sprocket A is the driving sprocket and has a angular velocity of 200 RPMs. Sprocket B is the driven sprocket and has a torque output of 353 inch· Ibs. ------Cf__--- A --- B

15. Calculate the torque of sprocket A. (1 pt.) .'3 _ )~J~ /7{;S: =r>: \~~ l)A 15. 1t:f4%2? J'" / bS- ~. Calculate the angular velocity of gear B. (1pt.) 10 o 16.----""=~=---___'___=______f!-f'---..:.-(ri_ 17. Use the following sketch of a Compound to find the systems IMA. Identify each of the simple in the picture by placing a number 1-10 next to them (THERE MAY NOT BE 10 SIMPLE MACHINES, EX: YOU MAY ONLY HAVE 1-8). Then identify each ofthose machines by their appropriate name and write the IMA for each machine in the table below. Be sure to clearly show and label all work for full credit. (10 pts)

r- IDem -1~2em -1 _'>7- -7})r-

I Input

Diameter of Diameter of axel wheel = 3 em =O.sem

6 em .f.-. 2 em

I2em

1 2 3 4 5 6 7 8 9 10 h~k~ 1Jt- 1<;f ) Lv~l ft1.gvq~ h~J /'"Ltl/~. NAME '~iR. , '(:, ~ I twV PUJt~ fwl~ fu~~ (f~,v-( ~~ 1(, (I' b) ./ 3 '- I L -)) IMA Z. - \0 2- - tb -1- ~ t 6"

C\ _ r - ...Il- lo s ~~LV

TQTAL IMA: ~/_t?J_'-f-,-----,--(t (I)