Example 33-1 Two workers were setting up a machine. Because vibrations would cause
defective parts, it was essential to determine if parts moved together and apart smoothly.
Feeling the vibrations was the only way to accomplish the fine adjustment needed. Con-
sequently, the hands of one of the workers were placed in contact with parts of the machine.
In this instance, the worker’s hands were on a fixed part that was contacted by a moving
part called a table.