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Chapter 6: Techniques of Micromotion Study

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Left-hand/Right-hand Chart. One operator only. Treats each hand as an activity ... Right-hand and left-hand chart with added feature of body member being used ... – PowerPoint PPT presentation

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Title: Chapter 6: Techniques of Micromotion Study


1
Chapter 6 Techniques of Micromotion Study
  • MGT230 Process Improvement and Lean Manufacturing

2
Types of Jobs
  • Individual with simple hand tools and fixtures
  • Individual working at a machine
  • Individual working many machines
  • Groups of people working together
  • ½ of work is reaching for and moving items
  • ½ of work contains body motions of grasping,
    walking, positioning

3
Techniques of Micromotion Study Charts
  • Charts - Operations analysis operator/machine
    Multimachine Gang Left-hand/right-hand SIMO
    Simultaneous Motion
  • Common Factors
  • Each activity is broken down into elements
  • Time is measured linearlyelements listed
    sequentially divided by horizontal lines
  • Use of same form
  • Visual charts sales tools

4
Operations Analysis Chart
  • Describes single activity
  • Tools and equipment are operator-controlled
  • Activity broken into elements, timed in decimal
    minutes

5
Operator/Machine Chart
  • Two activities operator and machine
  • Shows interrelationship of operator machine
  • Shows what each is doing at every moment in time
  • Each element aligned according to time

6
Producing Operations Analysis Charts
  • Identify problem chart to be used depends on
    number kind of activities
  • Number each operation to manufacture every part
  • Assign part number
  • Identify work date time initial of
    responsible person
  • Describe operation

7
Producing Operations Analysis Charts
  • Name activity job description name or machine
    name list elements of job as performed under
    activity name
  • Calculate total utilization utilization
  • Calculate total normal time in minutes per unit
  • Calculate allowance
  • Calculate standard time

8
Producing Operations Analysis Charts
  • Calculate hours/unit
  • Calculate pieces/hour
  • Calculate dollars/hour
  • Calculate dollars/unit
  • Report time study readings
  • Report number of cycles (occurrences)
  • Calculate average occurrence (total time per part)

9
Producing Operations Analysis Charts
  • Determine leveling factor
  • Calculate normal time
  • Draw work station layout (top view)
  • Determine motion pattern

10
Gang Chart
  • Two or more people work together and their
    activities intertwine
  • Hours per unit are multiples of one operators
    time
  • Pieces per hour calculated from one-person hours
    per unit
  • Cost reflects total personnel hours/unit must
    reflect all operations

11
Multimachine Chart
  • Each machine has own column
  • Include all part numbers and operation numbers
  • Total normal time is same for each activity
    operators time between each machine

12
Left-hand/Right-hand Chart
  • One operator only
  • Treats each hand as an activity
  • Hand activity is broken into elements and
    indicated in column opposite other hand
  • Each moment aligned hand to hand
  • One hand operations inefficient should be
    eliminated as much as possible
  • Gives utilization rates on both hands

13
SIMO Chart
  • One principle of motion economy body member
    requiring least effort be used
  • Right-hand and left-hand chart with added feature
    of body member being used
  • Body members include finger (easiest motion),
    wrist, forearm, full arm, shoulder (most
    effort)
  • Each activity analyzed for body member used

14
Evaluating the SIMO Chart
  • Analyze potential stress on trunk potential
    repetitive stress on fingers wrists

15
Homework
  • Answer and email to your instructor questions 3,
    4, 5, 6 and 7.
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