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.