introduction to work study
TRANSCRIPT
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INTRODUCTION TO INTRODUCTION TO WORK STUDYWORK STUDY
Rodger Koppa, P.E., Ph.D.Rodger Koppa, P.E., Ph.D.
Industrial and Systems Industrial and Systems EngineeringEngineering
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Work StudyWork Study
““The systematic examination of the The systematic examination of the methods of carrying on activities so as methods of carrying on activities so as to improve the effective use of to improve the effective use of resources and to set up standards of resources and to set up standards of performance for the activities carried performance for the activities carried out”out”
Introduction to Work Study (4Introduction to Work Study (4thth Ed) Ed) G. G. Kanawaty (Ed)Kanawaty (Ed)
International Labour Office, Geneva, International Labour Office, Geneva, Switzerland 1992Switzerland 1992
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Work Study Approaches
• Method Study– The What and How– Workplace design– Workplace layout
• Work Measurement/estimation– Time– Observation– Standards
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Method Study: Tools
• Process sequence charts
• Process flow charting:– Worker(s)– Material– Equipment
• Process Time lining
• Multiple Activity Chart
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Process Chart Symbols
= Operation (part, material, product modified or changed as result of operation
= Inspection (verification of operation or quality control)
= Temporary Storage/delay/in queue
= Transport (material handling)
= Storage (controlled or file)
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First Things First
• Make a list of steps to accomplish task
• Classify steps according to basic 5 chart symbols: O, I, D, T, S
• Sketch of assembly however crude can be valuable
• Then chart the process:– Overview: Outline (Operations) Chart– Detail analysis: Flow Process Chart
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Outline ChartOutline Chart
Highest level of descriptionHighest level of description Uses flowchart symbols O and IUses flowchart symbols O and I Each component of assembly has own Each component of assembly has own
column, symbols keyed to list of operations column, symbols keyed to list of operations or eventsor events
Assembly proceeds in time from right to leftAssembly proceeds in time from right to left Time for each step can be estimated or left Time for each step can be estimated or left
for later analysis for later analysis
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Detail Flow Process Chart
• Worker Type: Records what worker does
• Material Type: Records how material is handled or treated
• Equipment Type: Records how equipment is used
• DFPC prepared for each major component (vertical line of Outline Process Chart)
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Flow Diagram
• For material handling and multiple work stations a Flow Diagram can be helpful
• Use same symbols and numbers for events
• Study flow charts and diagrams together to visualize the method
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Process Critical AnalysisProcess Critical Analysis
5 basic events classify into 2 major 5 basic events classify into 2 major categories:categories:
1.1. Something is actually happening to Something is actually happening to material or work piece (being material or work piece (being worked on)worked on)
2.2. Material or work piece not being Material or work piece not being worked on—in transit, storage, or in worked on—in transit, storage, or in queue queue
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Being Worked on
3 things can be happening:1. Make Ready activities: to prepare
material/workpiece and set into position2. Do operations: effects change in shape,
chemical composition, physical condition3. Put Away activities: material/workpiece
move away after (2)Goal: Max (2); Min (1) and (3) Only (2) is
“productive”
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How to Max (2), Min (1;3)
Consider:• Purpose• Place• Sequence• Person• Means For each activity recorded on the process
chart
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Remember?
“I keep six honest serving men,
They taught me all I knew;
Their names are What and Why and When
And How and Where and Who.”
--Rudyard Kipling
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Purpose
• What is done?
• Why is it done?
• What else might be done?
• What should be done?
Goal: Eliminate unnecessary parts of the task
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Place
• Where is it done?
• Why is it done there?
• Where else could it be done?
• Where should it be done?
Goal: Combine or locate operations to simplify task
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Sequence
• When is it done?
• Why is it done just then?
• When could it be done?
• When should it be done?
Goal: rearrange sequence to be more effective and cut down time
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Person
• Who does it?
• Why does that person do it?
• Could anyone else do it?
• Who should do it?
Goal: Cut fatigue, combine jobs
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Means
• How is it done?
• Why is it done that way?
• How else might it be done?
• How should it be done?
Goal: Simplify!!
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THUS Basic 5 Questions:
• What should be done?
• Where should it be done?
• When should it be done?
• Who should do it?
• How should it be done?
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After Basic 5 Questions
• Draw new process charts
• Compare with original
• Estimate times for each operation and compare original vs. improved/simplified
• Ask Basic 5 again on each charted operation and see if further improvements possible
• Sell to management ($, People, Schedule)
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A Case Study
Refer to HandoutsSituation: Brewster Aviation
Receiving/Inspection DeptPhase I: Receiving Shipping cases unloaded from
delivery trucks Cases stacked one on top another Cases unstacked and moved to
receiving bench
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Case Study (Cont’d)
Phase II: Preliminary Inspection Parts cartons removed from shipping
case Parts unpacked and checked against
packing slip Parts repacked in carton Cartons replaced in shipping case Case placed in queue for transport to
inspection bench
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Case Study (Cont’d)
Phase III: Critical Inspection Parts cartons removed from shipping
case Parts unpacked and
inspected/measured with reference to specs
Parts repacked in carton Cartons repacked in shipping case Case transported to marking bench
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Case Study (Cont’d)
Phase IV: Marking and Inventory Parts cartons removed from shipping case Parts unpacked and marked for inventory Parts repacked in carton Cartons repacked in shipping case Case transported to Stores Cartons placed in bins in Stores until called
for by Assembly
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How Can This Material Flow Be Improved?
Use Critical Question Approach:Just for openers--- Why must cases be stacked if then
unstacked to open? Why are reception, inspection, and marking
places so far apart? Why does the case have to go all around
the building to reach Stores? Why are cartons unpacked and repacked 3
times before reaching Stores?
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Improved Method
Highlights: Shipping case goes right to a hand truck and is transported to
unpacking place, opened, packing list removed, and taken to Receiving Bench
Cartons unpacked and parts placed on Receiving Bench Parts counted against packing list, inspected, and inventoried Parts repacked in cartons and cartons repacked in case Case taken to Stores Case stays on hand truck through all of above
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Ask the RIGHT QuestionsAsk the RIGHT Questions
What should be done?What should be done? Where should it be done?Where should it be done? When should it be done?When should it be done? How should it be done?How should it be done?
Get outside the BOX of “we’ve always Get outside the BOX of “we’ve always done it this way!”done it this way!”
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ResourceResource
Much of the material in this lecture Much of the material in this lecture came from:came from:
Kanawaty, G. (Ed) Kanawaty, G. (Ed) Introduction to Work Introduction to Work Study (4Study (4thth Ed.) Ed.) Geneva: International Geneva: International Labour Office 1992Labour Office 1992
Another resource:Another resource:Groover. M.P. Groover. M.P. Work Systems and the Work Systems and the
Methods, Measurement and Methods, Measurement and management of Workmanagement of Work Pearson- Pearson-Prentice Hall 2007Prentice Hall 2007