This laboratory project seeks to lay down process and procedures of redesigning of a cam-follower system in machines. The primary objective of this project is to reduce the noise produced by machines, by redesigning the cam- follower system to meet the set goals. In the transformation that takes place on the simplest motion such as that in rotation into other motions, the cam mechanism is used to conveniently accomplish the process hence smooth transfer of energy in a machine system. As an objective to solve the problem regarding wear and noise in machines as much as possible, a computer software known as MSC ADAMS 2013 is used to help in redesigning of cam-follower.
The methodology of accomplishing complete redesign of the cam-flower systems, Appendix A in the lab manual will be used as the step by step procedures are followed. The procedures followed brings to the attention that circular diameter is considered with reduced circular diameter at the base is required. Rollers are used as well as changing of flower offset in the process. At the end of this laboratory project, the existing cam-follower system will be redesigned procedurally, and the new system will be adopted, that with the reduced noise and wear on a pint of motions within the machine.
Keywords: Cam, Followers, reducing wear and noise
The sound produced by the cam-follower system in machines as they operate on a daily basis has become a constant worry because in the process, wear in various parts of the machine also takes place. Cam, as defined, is a machine element with some curved grooves, hence upon rotation, produces a predefined motion to the follower. In its operation, it functions to transmit the energy to the follower element in machines such as shoe machinery, printing press, screw machines and textile machinery among other machines. In classification of cam mechanism, the project classifies cam regarding modes of output, configuration and arrangement and finally shape of the cam
According to the shape of cams, disk, translation and cylindrical cams are considered in the project. In disk cam, the follower moves along a perpendicular axis of oscillation of the camshaft. A swing arm is maintained in contact with the cam profile by being constrained in the process. On the other hand, cylindrical calm is designed whereby the groove cut on the periphery of the cylinder works in connection with the roller followers. To create the required cam-follower that will meet the goal of reduction in wear and noise, a lift of 20mm in a period of 90o of cam oscillation as well as dwell for 120o is put in place. In addition, a return of a period of 150o.
To adequately meet the required of a new cam-follower system, the parameter to include in the design is a fine cut of the disc as a form of fabrication as this will reduce the wear on the system during oscillation. Further, uniform motion, parabolic motion and modified parabolic is considered to come up with the right design. In conclusion, upon completion, a displacement diagram, which is a graph drawn to show the movement within the follower against function of time or angle of rotation, is plotted.