machine design (comprehensive)
問題一覧
1
Is a rotating machine element which gives reciprocating or oscillating motion to another element know as FOLLOWER.
- cam and follower have a line contact and constitute a higher pair.
- are usually rotated at uniform speed by a shaft.
CAM
2
Is predetermined and will be according to the shape of the cam.
Follower Motion
3
Follower reciprocates or oscillates in a direction perpendicular to the cam axis.
Radial or Disc Cam
4
- follower rides in a groove at its cylindrical surface.
- follower reciprocates or oscillates in a direction parallel to the cam axis.
Cylindrical Cam
5
- knife edge follower
- roller follower
- flat faced or mushroom follower
- spherical forced follower
Surface in Contact
6
- reciprocating or translating follower
- oscillating or rotating follower
Motion of the follower
7
- radial follower
- offset follower
Path of motion of the follower
8
- the contacting end of the follower has a sharp knife edge.
- seldom used in practice because the small area of contacting surface results in excessive war.
- a considerable side thrust exists between the follower and the guide.
Knife edge follower
9
- the contacting end of the follower is a roller.
- rate of ware is greatly reduced.
- side thrust also exists between the follower and the guide.
- are extensively used where more space is available.
Roller follower
10
- the contacting end of the follower is perfectly flat faced.
- side thrust between the follower and the guide is much reduced.
- wear may be reduced by off-setting the axis of the follower/
- generally used where space us limited.
- when the flat faced follower is circular, it is then called a MUSHROOM FOLLOWER.
Flat faced or Mushroom Follower
11
- the contacting end of the follower is of spherical shape.
- flat end of the flat faced follower is machined to a spherical shape to minimize stresses.
Spherical follower
12
follower reciprocates in guides as the cam rotate ms uniformly.
Reciprocating or Translating follower
13
uniform rotary motion of the cam is converted into predetermined oscillatory motion of the follower.
Oscillating or Rotating follower
14
motion of the follower is along an axis passing through the center of the cam.
Radial follower
15
motion of the follower is along an axis away from the axis of tue cam center.
Off-set follower
16
smallest circle that can be drawn to the cam profile.
Base circle
17
reference point on the follower and is used to generate the pitch curve.
Trace point
18
the angle between the direction of the follower motion and a normal to the pitch curve.
Pressure angle
19
point on the pitch curve having the maximum pressure angle.
Pitch point
20
a circle drawn from the center of the cam through the pitch point.
Pitch circle
21
curved generated by the trace point as the follower moves relative to the cam.
Pitch curve
22
the smallest circle that can be drawn from the center of the cam and tangent to the pitch curve.
Prime circle
23
the maximum travel of the follower from its lowest position to the topmost position.
Lift or Stroke
24
The follower, during its travel, may have one of the following motions:
1. Uniform Velocity
2. Simple harmonic motion
3. Unform acceleration and retardation
4. Cycloidal motion
Motion of the follower
問題一覧
1
Is a rotating machine element which gives reciprocating or oscillating motion to another element know as FOLLOWER.
- cam and follower have a line contact and constitute a higher pair.
- are usually rotated at uniform speed by a shaft.
CAM
2
Is predetermined and will be according to the shape of the cam.
Follower Motion
3
Follower reciprocates or oscillates in a direction perpendicular to the cam axis.
Radial or Disc Cam
4
- follower rides in a groove at its cylindrical surface.
- follower reciprocates or oscillates in a direction parallel to the cam axis.
Cylindrical Cam
5
- knife edge follower
- roller follower
- flat faced or mushroom follower
- spherical forced follower
Surface in Contact
6
- reciprocating or translating follower
- oscillating or rotating follower
Motion of the follower
7
- radial follower
- offset follower
Path of motion of the follower
8
- the contacting end of the follower has a sharp knife edge.
- seldom used in practice because the small area of contacting surface results in excessive war.
- a considerable side thrust exists between the follower and the guide.
Knife edge follower
9
- the contacting end of the follower is a roller.
- rate of ware is greatly reduced.
- side thrust also exists between the follower and the guide.
- are extensively used where more space is available.
Roller follower
10
- the contacting end of the follower is perfectly flat faced.
- side thrust between the follower and the guide is much reduced.
- wear may be reduced by off-setting the axis of the follower/
- generally used where space us limited.
- when the flat faced follower is circular, it is then called a MUSHROOM FOLLOWER.
Flat faced or Mushroom Follower
11
- the contacting end of the follower is of spherical shape.
- flat end of the flat faced follower is machined to a spherical shape to minimize stresses.
Spherical follower
12
follower reciprocates in guides as the cam rotate ms uniformly.
Reciprocating or Translating follower
13
uniform rotary motion of the cam is converted into predetermined oscillatory motion of the follower.
Oscillating or Rotating follower
14
motion of the follower is along an axis passing through the center of the cam.
Radial follower
15
motion of the follower is along an axis away from the axis of tue cam center.
Off-set follower
16
smallest circle that can be drawn to the cam profile.
Base circle
17
reference point on the follower and is used to generate the pitch curve.
Trace point
18
the angle between the direction of the follower motion and a normal to the pitch curve.
Pressure angle
19
point on the pitch curve having the maximum pressure angle.
Pitch point
20
a circle drawn from the center of the cam through the pitch point.
Pitch circle
21
curved generated by the trace point as the follower moves relative to the cam.
Pitch curve
22
the smallest circle that can be drawn from the center of the cam and tangent to the pitch curve.
Prime circle
23
the maximum travel of the follower from its lowest position to the topmost position.
Lift or Stroke
24
The follower, during its travel, may have one of the following motions:
1. Uniform Velocity
2. Simple harmonic motion
3. Unform acceleration and retardation
4. Cycloidal motion
Motion of the follower