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aims, introduction, calculations, discussion
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Declaration (statement of originality)
I declare that this report is my own original work. All secondary material that was used,
whether from print or electronic sources, has been carefully acknowledged and referenced
according to the Mechanical Department requirements. I have not submitted this work for credit
previously. I understand that plagiarism is unacceptable, and I have studied the department’s
plagiarism and referencing policies as set out in the Learner guide.
The aim of the experiment is to study the results obtained using different cam followers.
The objectives of the experiment include analyzing and comparing the theoretical displacement of
a cam profile to the experimental cam profile obtained and drawing the velocity and acceleration
cam profile.
A cam is a machine member which is used to impart specified motion by direct contact to another
element machine called a follower. The cam either rotates or oscillates while a follower translates
or oscillates.
Cams are classified according to their shapes. There is a plate cam (disk), wedge cam, cylindrical
cam (barrel), end cam (face), conical cam and a globoidal cam (Khurmi& Gupta,2005). In this
experiment a circular cam will be studied. Followers are classified based on the line/angle of
action, motion sequence and based on geometric shape element. In this study the flat and round
follower will be looked at.
Figure 1 : Circular cam
Figure 2 : Round and Flat cam follower
Table 1 : Specifications
Base Radius R (mm) 25
Curved Flank Radius 96.
Nose Radius, r (mm) 10
Maximum lift (Cam Stroke), h (mm) 15
Total Angle of Action 2 × 𝛼 140 °
Table 2 : Calculated results
Variable Value
r
1
= OB 25mm
r
2
= Nose circle radius 10mm
R = QD = Flank circle radius 96.21mm
d = Distance between the cam centre and nose circle 30
α = Angle of ascent 70 °
ϕ = Angle of contact on circular flank
Table 3 : Calculated results
Omega (ω) =
2πN
2π( 121 )
= 12 .671rad/s
Velocity
1
2
= 25 + 15 − 10 = 30mm
Figure 4 : Displacement vs angle curve
Figure 5 : Velocity Vs angle curve
-0.
-0.
-0.
-0.
0
0 20 40 60 80 100 120 140 160
VELOCITY (M/S)
ANGLE (º)
Velocity vs Angle
0
2
4
6
8
10
12
14
16
0 7
14212835424956637077849198
105112119126133140
Displacement, s (m)
Angle (deg)
Figure 6 : Acceleration vs Angle curve
The objective of the experiment was to compare the experimental displacement curve, acceleration
curve and the velocity curve with the theoretical curves. The velocity, displacement and
acceleration were calculated using Microsoft excel (see appendix). The comparison between the
experimental curves (see figure 4,5 and 6) and the theoretical curve (see appendix) and it was
discovered that the curves are the similar. The graphs for the circular cams and roller with the flat-
faced follower were successfully drawn. It can be seen from the experimental and theoretical
curves that the flat follower slows its movement when closer to the nose of the circular cam.
The experimental curves are not exactly the same as the theoretical curves. This could be due to
experimental error when recording the results, not enough information provided for the drawing
of the curves and failure to follow proper procedure.
It is therefore recommended that enough data and formulae should be provided for the experiment
and proper procedure should be followed.
The aim of the experiment was to study the results obtained using different cam followers. The
aim also included comparing the experimental displacement curve, velocity curve and acceleration
curve with the theoretical curves. Though less data was provided for the experiment the aim of the
experiment was successfully achieved. Therefore, the experiment was a success.
0
5
10
15
0 50 100 150
ACCELERATION (N/S^2)
ANGLE (º)
Acceleration vs Angle
Figure 7 : Theory behind cams
