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Robotics > firstexam > Flashcards

firstexam Flashcards

1
Q

A machine is something that ____ force

A

modifies

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2
Q

____ is when force comes from an outside source

A

Input

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3
Q

The mechanical action of the machine produces _____

A

output

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4
Q

The study of the motions and forces that occur between input and output

A

Mechanics

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5
Q

First Law of Mechanics

A

Motion does not require force; force only needed to accelerate motion

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6
Q

Second Law of Mechanics

A

The greater the force, the greater the acceleration

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7
Q

Third Law of Mechanics

A

Action and Reaction; of object pushed, it will push equally in opposite direction

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8
Q

5 basic mechanical systems

A

Inclined plane, wedge, screw, lever, wheel

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9
Q

Lever of first order

A

Fulcrum is always between load and effort

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10
Q

Lever of second order

A

Load lies between fulcrum and effort

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11
Q

Lever of third order

A

Effort applied between fulcrum and load

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12
Q

Shaft and bearing

A

Shafts can be anything, they must fit bearings which keeps the rotating shaft stable and running smoothly

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13
Q

Snail Cam

A

Pushes shaft upwards; shaft also needs support of a bearing;

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14
Q

Crank

A

A lever attached to a rotating shaft - converts rotation to reciprocation; crank is circular disk with pin, rod constrained by guides, when shaft rotates, rod reciprocates

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15
Q

Cams turn_____ motion into an upward and downward motion

A

rotary

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16
Q

Lobe cams

A

Produce multiple events per cycle

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17
Q

All machines almost always employ at least _____

A

one lever

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18
Q

Mechanical ______ is ratio of load versus effort

A

advantage

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19
Q

Leverage is the ratio distances of the ____and load to the fulcrum

A

effort

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20
Q

A lever of the second order is also known as a force _____

A

multiplier

21
Q

A lever of the third order is also known as a force _____

A

reducer

22
Q

A ______converts rotation to reciprocation

A

lever attached to a rotation shaft-cranks

23
Q

____is the difference between a cam’s minimum and maximum radii

A

Throw

24
Q

Eccentricity

A

Means to be off-center; like a cam

25
Q

Unlike cranks, cams have the ability to store _______

A

information

26
Q

Cams are the ______version of computer programs

A

mechanical

27
Q

A ____ crank converts up-down motion to side-to-side motion

A

bell

28
Q

A 3-bar linkage is for _____motion

A

straight-line

29
Q

A slider-crank with a _____increases lever sway

A

lower bearing

30
Q

Levers move in a ______arc

A

circular

31
Q

A _____can be used to keep the lever against the cam so it follows the profile

A

spring

32
Q

Springs in cam-followers increase _____, so tensioners are used

A

friction

33
Q

4 types of springs

A

compression, extension, torsion, and radial springs

34
Q

Ratchets give ____motion

A

stepped

35
Q

For ratchets, the ______ stops the wheel from slipping back

A

second pawl (detent)

36
Q

Drives and gearing provide _____ connections

A

rotary-to-rotary

37
Q

In friction drives, _____is often employed to prevent belt slip

A

flanges

38
Q

A _____ is a tensioning mechanism which is used to take up slack in a belt

A

tensioner

39
Q

In timing belts, the belt has ____ to engage the notches in the pulley wheels

A

teeth

40
Q

In chain and sprocket drives, ____ can be added or removed

A

links

41
Q

Spur gears have the same number of ____

A

teeth

42
Q

In a _____drive, the geared wheel meshes with a toothed rack

A

rack and pinion

43
Q

In a _____drive, the geared wheel meshes with a toothed rack

A

worm gear

44
Q

In bevel gears, the 2 wheels mesh at ____degrees

A

45

45
Q

The _____is simpler form of the bevel gear and is easier to fabricate

A

pin wheel

46
Q

In bevel gears, the _____changes from horizontal to vertical

A

plane of rotation

47
Q

Two types of positive drives

A

Toothed Belts and Chain&Sprocket

48
Q

Two types of drives

A

Friction and positive; positive have input and output locked and synchronous while friction use friction to transfer movement

49
Q

Bevel gear changes the plane of rotation from ______ to _____

A

horizontal to vertical

Robotics (1 decks)

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