it is a WORD FILE for METHOD STUDY.
college btech students specially MECHANICAL ENGNN. and PROFESSORS can access this file.
it is HELPFUL for an idea about the topic, for EDUCATION purpose and for PRESENTATION PAPER WORK IN SEMINARS etc.
This is presentation about Micro-Macro Motion Study in use of work study. here defined about work method in subject of industrial engineering technology,
method study is the branch of an industrial Engg. specially the sub branch of mechanical engg.
those who r the college students of engg. specially mechamnical 8mechanical can download this .it is very helpful for presentation purpose
Work Study: Definition, objective and scope of work study. Human factors in work study. Work study and management.
Method Study: Definition, objective and scope of method study, activity recording index aids. Charts to record moments in shop operation – process charts, flow process charts, travel charts and multiple activity charts.
it is a WORD FILE for METHOD STUDY.
college btech students specially MECHANICAL ENGNN. and PROFESSORS can access this file.
it is HELPFUL for an idea about the topic, for EDUCATION purpose and for PRESENTATION PAPER WORK IN SEMINARS etc.
This is presentation about Micro-Macro Motion Study in use of work study. here defined about work method in subject of industrial engineering technology,
method study is the branch of an industrial Engg. specially the sub branch of mechanical engg.
those who r the college students of engg. specially mechamnical 8mechanical can download this .it is very helpful for presentation purpose
Work Study: Definition, objective and scope of work study. Human factors in work study. Work study and management.
Method Study: Definition, objective and scope of method study, activity recording index aids. Charts to record moments in shop operation – process charts, flow process charts, travel charts and multiple activity charts.
Process Charts and Process Sequence Charts: Tools for Process ImprovementCIToolkit
A symbolic representation that illustrates the sequence of activities within a process. Used to show all the operation, inspection, storage, transportation, and delay activities that exist in a process.
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2. METHOD STUDY
Definition:
“It is a systematic recording and critical examination of existing and proposed
ways of doing work, as a means of developing and applying easier and more
effective methods and reducing costs.”
WHY:
The improvement of processes and procedures.
The improvement of factory, shop and workplace layout.
The improvement of the design of plant and equipment.
Economy in human effort and the reduction of unnecessary fatigue.
Improvements in the use of materials, machines and manpower.
The development of a better physical working environment.
Improvement of quality of the products.
2
3. Recording Techniques
in Method study
Indicating
Process
Sequence
Outline
process chart
Flow process
chart
Man type
chart
Material type chart
Using a time scale
Multiple
activity chart
Simo chart
P.M.T.S.
chart
Diagrams
indicating
movements
Flow
Diagrams
String
Diagram
Cycle
Graph
Machine type chart
Chrono-cycle
Graph
Two -Handed
process chart
Travel Chart
3
4. Process Chart Symbols
1.Operation
Indicates the main steps in a process, method or procedure.
Usually the part, material or product concerned is modified or
changed during the operation.
2.Inspection
Indicates an inspection for quality and / or check for quantity
3.Transport
Indicates the movement of workers, materials or equipment from place
to place
4
5. 4.Temporary Storage or Delay
Indicates a delay in the sequence of events : for example, work waiting
between consecutive operations, or any object laid aside temporarily without
record until required.
5.Permanent Storage
Indicates a controlled storage in which material is received
into or issued
from a store under some form of authorization; or an
item is retained for
reference purposes.
6.Combined Activities
Indicates a controlled storage in which material is received into or issued
from a store under some form of authorization; or an item is retained for reference
purposes.
5
7. Outline Process Chart
Definition:
An outline process chart is a process chart giving an
overall picture by recording in sequence only the main
operations and inspections.
While preparing the outline process chart we
use Symbols of Operation and Inspection
A brief note of the nature of each operation is
made beside the symbol
In an outline process chart, only the principal
operations and the inspections carried out are
recorded to ensure effectiveness
7
9. Flow process charts
Definition:
Flow process charts are graphic representations of the
sequences of operations, transportation, inspections,
delays and storages occurring during a process or a
procedure and include information considered for
analysis such as, time required and distance moved.
To develop an understanding how a process or work
happening and clearly documenting how a particular job
is done, in addition of that mapping a process in flow
chart format helps us where the process can be
improved.
9
10. Types of Flow Process Charts
Material or product type.
Man type.
Machine type or equipment.
Material or product type flow process chart:Records what happens to the material or product i.e. the changes the
material or product undergoes in location or condition (includes
operation and transportation).
Man type process flow process chart:-
Records the activities of worker or operator i.e. what a worker or
operator does. In this type of chart usually storage term is not
applicable.
Machine or equipment type flow process charts:- Records
the manner in which a machine or an equipment is used.
10
15. Machine type flow process chart
Job : Assembly of flange at shrink fitting m/c.
15
16. Two Hand Process Chart
Two-Handed Flow Process Chart, is a
motion study where the study is done to
analyse the motions used by the worker in
performing an activity.
In this chart the activities of a worker’s
hands (or limbs) are recorded in their
relationship to one another.
A Two-Handed Process Flow Chart
individually shows the movement of each
hand in a manual process. It is typically
used for repetitive operation when analyzing
a manual assembly process, to help make it
easier to perform.
16
17. Why:
The objective of this investigation is to eliminate or reduce
the unwanted motions and to arrange the remaining motions
in a best sequence.
How:
A two-handed process chart is made up of two
columns in which the activities of the left hand
and right hand and the appropriate symbols are
respectively recorded in sequence.
The activities of the two hands are inter-related
by aligning the symbols on the chart so that
movements by both hands appear opposite to
each other.
Additional columns can be designed to record
the activities of the other parts of the body
whenever necessary.
17
18. Operation
An operation occurs when the hand grasps, releases
or assembles tool, material, component etc.
Transport
Transport occurs when the hand moves from one
position to another at the work place.
Delay
Delay occurs when the hand is Idle in the sense that
it is not performing any activity.
Hold
The term storage is not used in connection with the
two handed process chart. Instead the symbol is re
designated as hold. A hold occurs when the hand
holds an object so that the other hand may be able to
do something to that object.
Inspection
This symbol is not generally used in this.
18
20. Fig. 1. Example of a Two-handed process flowchart
Fixing Screw on a Assembly
20
21. Fig. 1. Example of a Two-handed process flowchart
Fixing Screw on a Assembly
21
22. MULTIPLE ACTIVITY CHART
A Chart in which the activities of more than one item are
recorded on a common time scale to show their interrelationship. Man machine chart is the type of multiple activity
charts.
TYPES:
Man - Machine chart: One man handling one job or one machine.
Man - Multi machine chart: One man handling a numbers of machines.
Machine Multi - man chart: A group or gang doing collectively one job
as in riveting.
Multi – Man - Machine chart: A number of persons working on a
computer system.
22
23. MULTIPLE ACTIVITY CHART
Definition:
A Multiple activity chart is a form of process chart recording the
related sequence of work of a number of operators and/or
machines on common time scale. In it, the activities of more than
one item, worker, machine or equipment are recorded on a
common time scale to show their inter relation ship.
Why:
Multiple Activity Charts are very useful tool for understanding
the flow of work in a cyclic process and as a consequence
understanding which resource is controlling the overall progress of
the work.
The tool can be used to model different scenarios to determine the
optimum mix of resources for the work.
23
24. Multiple activity chart brings out the comparative utilisation of
men and machines very clearly and helps to synchronise the
various activities and improve the situation. It is a useful tool for
planning team work and determining the staffing pattern.
The multiple activity charts shows up clearly the periods of
ineffective time and by rearrangement of work it becomes possible
to eliminate or reduce the injective time.
How:
Activities of the machines are recorded in relation to that of the
operator, the chart is sometimes called as the man machine chart; This is
only a special variant of the multiple activity chart
24
25. Example on Man Machine Chart (Present Method)
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
25
26. EXAMPLE ON MAN MACHINE CHART
(Summary of Present method)
CYCLE TIME(MIN)= 2.0
Man –
Machine
Working Idle Time Utilizatio
Time
(min.)
n
(min.)
(%)
MAN
1.2
0.8
60%
MACHINE
0.8
1.2
40%
26
27. Example on Man Machine Chart (Improved Method)
TIME
(MIN)
MAN
MACHI TIME
NE
(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
27
28. EXAMPLE ON MAN MACHINE CHART
(Summary of Improved method)
CYCLE TIME(MIN)= 1.4
Man –
Machine
Working Idle Time Utilizatio
Time
(min.)
n
(min.)
(%)
MAN
1.2
0.2
85.7%
MACHINE
0.8
0.6
57.0%
28
30. Micro motion study
Micro motion study is the study of fundamental
element or subdivision of an operation by means of
a motion picture camera and a timing device which
accurately indicates the time interval on motion
picture film.
Micro motion study provides a valuable technique
for making minute analysis of those operation that
are short in cycle contain rapid movement and
involve high production over a long period of time.
For example. Sewing of garment, assembly of small
parts.
30
31.
Applicable for operations with very short cycles which are
repeated thousands of times.
Goes into greater details to determine where movements and
efforts can be saved and to develop the best possible patterns
of movements.
Enables operators to perform the operation repeatedly with
minimum effort and fatigue.
The technique used for this typically involves filming the
operation and hence is known as micromotion study.
Examples of operators studied could be cashier in the bank –
routine job of taking payment slips from customer and
issuing cash!
31
32.
Based on the idea that human activity can be divided into
movements or group of movements (therbligs) according to
the purpose for which they are made.
The therbligs cover movements or reasons for the absence of
movement.
Each therblig has specific color, symbol and letter for
recording purposes.
Therbligs refer primarily to motions of the human body at
the workplace and to the mental activities associated with
them.
32
33.
They permit a much more precise and detailed description of
the work than any other method described.
Considerable practice is required in identification of
therbligs before they can be used for analysis with
confidence.
33
34. Main advantages of films over visual methods are:
Permit greater detailing than eye observation;
Provide greater accuracy than pencil, paper and stop watch;
More convenient;
Provide a positive record;
Help in the development of the work study person.
34
35. Objective of Micro motion study
1. To find most efficient way of doing work
2. Helps to study repetitive short cycle operation which
cannot be studied by ordinary method.
3. To train operator regarding motion economy.
4. It is permanent means of keeping record of method.
5. It assists in research project in the field of work study
6. It helps to study complex activities of short duration
performed with extreme rapidity.
35
36. Procedure/ Step in micro motion study
1.
2.
3.
4.
Filming the operation to be studied.
Analyzing the film.
Charting the result of analysis.
Developing and improve method.
Filming :-
The filming speed is 16 frames per second with a 16 mm movie
camera.
Film Analysis:-
1.A Projector is used for analysis purpose.
2. Projector runs the films very slowly and film can be stopped &
reversed whenever required.
36
37. EQUIPMENT REQUIRED
1. 16 mm film.
Exposure meter.
2. Movie Camera.
3. wink counter.
Motion picture projector with screen
37
38.
A record of path of movements, usually traced by a
continuous source of a light on a photograph.
The path of movement of a hand, may be recorded on
a photograph by putting a ring carrying small light on
worker’s hand.
A path of light resembling a white wire is seen.
Later it is used with a stereoscopic camera to show
the path in three dimensions .
38
40.
This is a development of the cycle graph by interrupting the
flow of current so as to obtain, in the resulting sequence of
flashes, a record of the time and direction of the motions under
observation. The resulting image was a chronocyclograph.
The path of light appears as a series of pear-shaped dots, the
movement being in the direction in which the dots point.
The spacing between the dots indicate the speed of movement
and show acceleration and deceleration.
This is done by using a turning fork, which is vibrating at a
known speed, and connected with a “make and break”
contact.
40
44. Diagrams
Diagrams gives pictorial view of the layout of workplace on
which locations of different equipment, machines etc. are
indicated.
The movement of subject(man or machine) is then indicated on
the diagram by a line or a string.
The diagram are valuable in highlighting the movement so the
analyst can take steps to simplify or reduce it so as to obtain
saving in time.
The most commonly used method study diagrams are:
o Flow diagram
o String diagram
o Travel chart
o Cyclegraph and Chronocyclegraph
44
45. Flow diagram
It’s a top view of the work area correctly indicating the positions
of machining and other locations affecting the movement of
subject.
Therefor it gives “on-the-spot observation” of the paths of
movement of product sometimes using symbols of process
charts.
45
46.
A scale plan or model on which a thread is used to trace
and measure the path of workers, material or equipment.
A thread is used to measure distance.
Necessary that the string diagram be drawn correctly to
scale, whereas regular flow diagram can be drawn only
approximately to scale.
Thus, string diagram and flow chart can give clearest
possible picture of what is actually being done.
String diagram can be used to plot movements of material
to know how far the materials travel.
Most commonly, the string diagram is used for plotting
the movements of workers.
46
49. Travel chart
String diagram is good to explain movements and critical
examination but
o
it takes longer time to get constructed and
o
many movement along complex paths may lead to
a diagram with maze of crisscrossing line.
Therefore, when movements are very complex travel chart is
quick and more effectively manageable recording technique.
How is it made ?
o A travel chart is a tabular record for pressing quantitative
data about the movements of subject between any
numbers of places a over a given period of time.
o This chart is a square table and each square within table
represents a station.
o It has number of rows and columns equal to the number
of stations that can be visited by the subject.
49