Dedicated assembly systems, compared with flexible assembly systems, are generally intolerable of defective parts. It has proved effective to install a 100% inspection station prior to the workhead to maintain up-time in some installations.
The ease with which a part can be presented to a workhead automatically
at the required feed rate, and assembled within the specified cycle
time, depends upon the; design of the part, design of the equipment,
and the method of assembly. Each element of assembly automation has
it's own maximum performance characteristic. For example, the cycle
time of a pick and place unit depends upon the degrees of freedom, the
actuator stroke and the actuating medium, i.e. compressed air,
hydraulic oil, DC servo motor. A feeder is limited by its maximum
conveying velocity and the insertion process is affected by the
positional accuracy of the rotary table, robot, or platen location.