15-01-2013, 12:23 PM
WORKER-MACHINE RELATIONSHIPS
1WORKER-MACHINE.pdf (Size: 18.29 KB / Downloads: 101)
Multiple activity charts:
chart on which activities of workers, product and machines are recorded on a common
time scale to show their relationships (actually a variety of charts with different names, but all do the same thing):
1) Worker-machine process chart (man-machine chart) - seeking most effective relationship between operator(s)
and machine(s), i.e. minimum total %idle time.
a) worker/operator on left e) break in line (white) = idle time
b) machine on right f) broken/dotted line (shaded) =loading/unloading
c) common vertical time scale g) summary
d) solid line (dark) = productive time
2) Gang process chart (multi-man chart) - multiple activity chart applied to a group of workers, seeking most
effective relationship between several workers, same principles as above
Worker-machine relationships can be of three types:
1) synchronous servicing
2) random (asynchronous) servicing
3) combination of both - ‘real-life’
Synchronous servicing - case with a fixed machine cycle time in which the worker loads/unloads the machine
(both worker and machine are utilized simultaneously!) the machine at regular intervals. Ideally, several machines
can be serviced (machine coupling).