gears, pulleys, cams & linkages

Question 1

spur gears

Answer 1

wheels which contain teeth that interlock with each other as they turn

Question 2

driver

Answer 2

operated by hand or with a motor

Question 3

driven

Answer 3

output-rotate in an opposite direction the driver

Question 4

gear train

Answer 4

three or more wheels connecting

Question 5

idler

Answer 5

smaller wheel connecting the driven and driver

Question 6

gear ratio

Answer 6

the difference between the speed of the driven and driver

Question 7

gear ratio (calculation)

Answer 7

no. teeth on driven/no. teeth on driver

Question 8

driven speed in rpm (calculation)

Answer 8

driver speed/gear ratio

Question 9

pulley

Answer 9

a wheel with a grooved outer edge that houses a belt/cable

Question 10

what are pulleys used for

Answer 10

to make lifting heavy objects easier

Question 11

what does one pulley change?

Answer 11

the direction of the force required

Question 12

what do two pulleys change?

Answer 12

the magnitude of the force (making the object seem lighter)

Question 13

belt drives

Answer 13

transfer movement from one rotating shaft to another

Question 14

where are belt drives found

Answer 14

pillar drills, washing machines, conveyor belts

Question 15

what is the driver connected to in a belt drive

Answer 15

a handle or motor

Question 16

linkages

Answer 16

a method of connecting rigid parts together

Question 17

what can linkages change?

Answer 17

the size of the force and the direction of the motion

Question 18

parallel motion linkage

Answer 18

the input motion is the same as the output motion, but the moving arm moves in the opposite way

Question 19

reverse motion linkage

Answer 19

the push and pull motions are in opposite direction to each other

Question 20

bell crank

Answer 20

changes the direction of a force through 90°

Question 21

cam

Answer 21

used on a crank shaft to translate a rotary motion into a reciprocating motion

Question 22

follower

Answer 22

rests on top of the cam and moves accordingly as it follows the shape

Question 23

eccentric/circle

Answer 23

rises/falls once, smooth, continually moves

Question 24

snail/drop

Answer 24

rises/falls once, smooth and rough as it rises then drops suddenly

Question 25

square

Answer 25

rises/falls 4 times, rough, stops and starts

Question 26

360° eccentric

Answer 26

rises/falls once, smooth, continually moves, spins round 360°

Question 27

pear

Answer 27

rises/falls once, smooth, stops and starts

Question 28

triangle

Answer 28

rises/falls 3 times, rough and fast, stops and starts

Question 29

4 lobed

Answer 29

rises/falls 4 times, rough and rapid

Question 30

180° eccentric

Answer 30

rises/falls twice, spins round 180° one way then 180° the other way