Eccentric camfollower

Note: They can be modelled, in wooden mechanical toys for example, by drilling a Ply or MDF disc off-centre and gluing it on to a rotating Dowel.

Snailcam

Note that the cam follower need not just move up and down in a reciprocating motion, but it can be a lever as shown, which will produce oscillating motion.

Eccentric camexamples

Cams with complex profiles can be complicated to manufacture, particularly with the type of equipment available in the school workshop. However, if all that is required is to produce a single up and down motion for every revolution on the cam, a circular cam rotating about a point offset from its centre (i.e. eccentric), will often suffice.

An Eccentric Cam would normally provide the follower with Simple Harmonic Motion - (this can be defined as the projection of a point on the diameter of a circle as it precesses around it with constant angular velocity).

The 6216 is a 80 mm Ball Bearing that can be used in many rotary and factory automation applications. The 6216 Deep Groove Ball Bearings is an open style bearing. The 6216Z ball bearing is a single row raceway and single shielded. The 6216ZZ ball bearing has a single row raceway and it is shielded on each side. The 6216DDU, 6216LLU ball bearing are shielded by two rubber seals on each side. The 6216 80 mm Ball Bearing Inner Dimension 80mm X Outer Dimension 140mm X Width 26mm is an open style ball bearing designed for high rotational speeds and high dynamic loads.