The design activity consist in the geometric definition of the Cam profile and, as immediate
result, the check of the follower operation.
In order to create the Cam curve responding to the y = f(a) coinciding with the required y = f(t)
it is supposed that the camshaft rotates at the fixed constant angular velocity ω = 2 π / t (in the
case it is α = ω * t)
Two typology of the follower are taken into account :
1. RADIAL
Translating Follower
2. OSCILLATING Follower
Inside the two Follower typology are taken into account the following Follower types:
1. Roller Follower
2. Flat-faced Follower
3. Knife-edge Follower
It is possible to take into account the Follower constraint obtaining the cam contour either for
positive drive or spring load. A part from any structural aspect inside the Cam drawing, CMM2000 gives exclusive reference to the kinematics aspect of the Cam.
The kinematics correlates the attended features of the Follower (position, velocity, acceleration)
with those of the mover (Cam profile).
The analysis can follows two way :
1. When it is known the follower Motion Type the Cam profile, correlated with
displacement, velocity and acceleration are immediately calculated.
2. When it is known the Cam profile (FILE of POINTS) are verified the Follower
kinematics as displacement, velocity and acceleration.
It s necessary therefore to select the Follower type in order to correctly synthesize the Cam
profile.
RADIAL Translating Follower
1. Roller Follower : The synthesized profile correspond to the track followed by the center
of the Roller. The effective Cam profile can be obtained offsetting the synthesized Profile
of a quantity corresponding to the Roller radius or directly using the “Cutter radius
Offset” on the CNC.
2. Knife-edge Follower : The case is analogous to the previous but the radius of the
Follower is “0”.
3. Flat-faced Follower : The contact point between Cam profile and the flat of the
Follower change position continuously in respect to the axis of the Flat-faced Follower.
The synthesized profile is generated by the group of the envelope lines of the
displacements.
OSCILLATING Follower
1. Roller Follower
2. Knife-edge Follower
3. Flat-faced Follower
Each condition arranges an automatic solution introducing the Cam profile correction when are
known the feature of the Cam-Follower group.
CMM2000 Help
