This is a presentation on CAM and Follower which is a part of Kinematics of machine.

1. • Classification of
cams.
• Classification of
followers.
• Nomenclature.
• Displacement
diagram of a
follower.
Presentation prepared by :
Kunj Thummar

2. • A Cam is a
rotating element
which transfers its
rotary motion into
reciprocating
motion or
oscillating motion
to another
element known as
Follower .

4. • In radial cam
the follower
reciprocates
or oscillates
in a direction
perpendicular
to the cam
axis.

5. In cylindrical cam the
follower reciprocates
or oscillates in the
direction parallel to
the cam axis .

6. A) According to the surface in contact :
- Knife edge follower
- Roller follower
- Flat faced follower
- Spherical follower
B) According to the motion of the follower :
- Reciprocating follower
- Rotating follower
C) According to the path of the motion of follower :
- Radial follower
- Offset follower

7. Knife edge follower :
When contacting end of
the follower has a sharp
knife edge, it is called
as a knife edge follower.
Roller follower :
When the connecting end
of the follower is a roller,
it is known as a roller
follower.

8. Flat faced follower :
When the contacting
surface of the follower is
perfectly flat, it is known
as flat faced follower.
Spherical follower :
When the contacting
surface of the follower is
un spherical shape, it is
known as a spherical
follower.

9. Reciprocating follower :
When the follower
reciprocates in guides as the
cams rotates uniformly, it is
known as reciprocating
follower .
Oscillating follower :
When the uniform rotary
motion of the cam is
converted into the
predetermined oscillatory
motion of the follower, it is
known as oscillating follower .

10. Radial follower :
When the motion of the
follower is along the axis
passing through the cam
axis, it is known as a radial
follower .
Off – set follower :
When the motion of the
follower is along an axis
away from the axis of cam
center, it is known as a off-
set follower .

11. NOMENCLATURE

12. Cam profile :
It is the outer surface
of the disc cam.
Base circle :
It is the shortest
radius from the cam
center to any part of
the cam profile.
Pitch curve :
It is the path
generated by the
trace point as the
follower is rotated by
a stationary cam.

13. Prime circle :
It is the smallest circle from
the cam center through the
pitch curve.
Pressure angle :
It is the angle between the
direction of follower and
perpendicular to pitch
circle.
Pitch point :
It corresponds the point of
maximum pressure angle.

14. Pitch circle :
It is the circle drawn from
the cam center and
passes through the pitch
point.
Stroke :
It is the greatest diameter
or angle to which the
follower moves or rotates.

15. • Follower type = Knife edged, in-line; lift = 50mm;
base circle radius = 50mm; out stroke with SHM,
for 600 cam rotation; dwell for 450 cam rotation;
return stroke with SHM, for 900 cam rotation;
dwell for the remaining period. Determine max.
velocity and acceleration during out stroke and
return stroke if the cam rotates at 1000 rpm in
clockwise direction.

16. Stroke length = 50mm
Rise period = 60° ( SHM )
Dwell period = 45°
Fall period = 90° ( SHM )

17. • Follower type = roller follower, in-line; lift =
25mm; base circle radius = 20mm; roller radius =
5mm; out stroke with UARM, for 1200 cam
rotation; dwell for 600 cam rotation; return stroke
with UARM, for 900 cam rotation; dwell for the
remaining period. Determine max. velocity and
acceleration during out stroke and return stroke if
the cam rotates at 1200 rpm in clockwise
direction.

18. • Stroke length = 265mm
Rise period = 120° ( UAM )
Dwell period = 60°
Fall period = 90° ( URM )

19. 1) THEORY OF MACHINES
R.S. Khurmi & J.K. Gupta
S. Chand publication
2015 edition
2) KINEMATICS OF MACHINES
F. Sayad
Techmax publication
2015 edition
3) www.google.com (images)
data as on 18-7-2016