The worker and machine process chart (Man-machine chart) shows the exact time relationship between the working cycle of a person and the operating cycle of a machine at a specific workstation. It can be used to detect idle time on machines and workers, optimize work distribution, and decide the appropriate number of workers. The example shows a man-machine chart for the current and improved methods of a casting production process. The improved method reduces the cycle time from 2 minutes to 1.4 minutes by decreasing the idle times for both the worker from 0.8 to 0.2 minutes and the machine from 1.2 to 0.6 minutes.

1. Prepared by :-
Ajinkya Karlekar

2. The worker and machine process chart (Man-machine chart)
is used to study, analyze, and improve one workstation at a
time.
The chart shows the exact time relationship between the
working cycle of the person and operating cycle of the
machine.
These facts can lead to utilization of both worker and
machine time, and a better balance of the work cycle.

3. To detect the idle time on machine and workers
To optimize work distribution between workers and
machines.
To decide no. of workers in a group.
To balance the work team
To examine the activities.
It is used for recording the complex movements of
material or men.
To organize teams of workers on mass production
work.

4. Plant repair & maintenance.
Job construction.
Planning team work.
It is used to check whether the
work station is correctly located.

5. Independent Combined Ideal time
Activity Activity

7. 7

8. 8
TIME
(MIN)
MAN MACHINE TIME
(MIN)
0.2 Remove finished casting
cleans with compressed
air
IDLE 0.2
0.4 Gauge depth of slot on
surface plate
IDLE 0.4
0.8 PLACE in a box obtains
new casting
IDLE 0.8
1.0 Cleans machine with
compressed air
IDLE 1.0
1.2 Locates castings in
fixture, starts machine
IDLE 1.2
1.4 IDLE Cutting slot 1 1.4
1.6 IDLE Cutting slot 2 1.6
1.8 IDLE Cutting slot 3 1.8
2.0 IDLE Cutting slot 4 2.0
Example on Man Machine Chart (Present Method)

9. Man –
Machine
Working
Time
(min.)
Idle Time
(min.)
Utilizatio
n
(%)
MAN 1.2 0.8 60%
MACHINE 0.8 1.2 40%
9
CYCLE TIME(MIN)= 2.0
EXAMPLE ON MAN MACHINE CHART
(Summary of Present method)

10. TIME
(MIN
)
MAN MACHIN
E
TIME
(MIN)
0.2 REMOVED FINISHED CASTING
CLEANS WITH COM PRESED AIR
IDLE 0.2
0.4 CLEAN MACHINE WITH
COMPRESED AIR
IDLE 0.4
0.6 LOCATEES A NEW CASTING IN A
FIXTURE START MACHINE
IDLE 0.6
0.8 BREAKS SHARP EDGES WITH
FILES CLEANS WITH
COMPRESSED AIR
CUTTING
SLOT 1
0.8
1.0 GAUGE DEPTH OF SLOT ON
SURFACE PLATE
CUTTING
SLOT 2
1.0
1.2 PLACES CASTING IN A BOX
PICKS UP NEW CASTING AND
PLATE BY MACHINE
CUTTING
SLOT 3
1.2
1.4 IDLE CUTTING
SLOT 4
1.4
10
Example on Man Machine Chart (Improved Method)

11. EXAMPLE ON MAN MACHINE CHART
(Summary of Improved method)
CYCLE TIME(MIN)= 1.4
Man –
Machine
Working
Time
(min.)
Idle Time
(min.)
Utilizatio
n
(%)
MAN 1.2 0.2 85.7%
MACHINE 0.8 0.6 57.0%
11

12. COMPARISION BETWEEN
PRESENT AND IMPROVED METHOD
CYCLE
TIME
(MIN)
MAN IDLE
TIME(MIN
)
MACHINE
IDLE TIME
( MIN)
PRESENT
METHOD
2.0 0.8 1.2
IMPROVED
METHOD
1.4 0.2 0.6
12

13. THANK YOU