MOST时间分析MOST Analysis

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Maynard
Operation
Sequence
Technique
零恩工业工程咨询Objective of MOST
Measure the time it takes to perform a task
•Break the sub-operation down into method steps (each step represents the movement of an object)•Analyze a sequence model for each method step •Total the time for each step and for the sub-operation
零恩工业工程咨询Advantages of MOST
•
Universal Approach •
Fast to Apply •
Adequate Accuracy •
Easy to Understand and Learn •
Minimum of Paperwork •
Multilevel System •
Consistent Results •Encourages Method Development and
Improvement
•It is Top -Down Technique
零恩工业工程咨询Concept of MOST
•Work = force X distance
•In Work, you move an object
•GET and PUT
•For example, you can lift a box and place it down three feet away.
•This is the foundation of BasicMOST and the sequence models that make up MOST.
Sub-activity
Is a defined, discrete sub-division of an activity or sequence model
MOST Analysis
Is a complete study of an operation or a sub operation consisting of one or several method steps and corresponding sequence models, as well as appropriate parameter time values & total normal time for the operation or sub-operation
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零恩工业工程咨询•The sequence models show the series of events or phases that occur when moving an object or using a tool.
Get
Put Return A B G A B P A Phase:Sequence
Model:
•Each letter in the sequence model represents a parameter that helps describe the action.
•There are three types of sequence models:
–General Move ABG ABP A
–Controlled Move ABG MXI A
–Tool Use ABG ABP _ ABP A
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General Move Phases Get Put Return
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零恩工业工程咨询Parameter Indexing
Get
Put Return A B G A B P A 1 0 3 1 0 10
•Follow sequence model and look up index values according to application rules •Sum the index values
1 + 0 + 3 + 1 + 0 + 1 + 0 = 6
•Multiply by 10
6 X 10 = 60 TMU
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Data Card
零恩工业工程咨询Frequencies
•Sweep up four pencils from a desk and place them one by one into separate cups. Distances within reach.
A 1
B 0G 3(A 1B 0P 1) A 0 (4) = 120 TMU
Get
Put Return A B G A B P A
零恩工业工程咨询Get
Put Return A B G A B P A
Intermediate
Method Level
•Grasp two pins (one from right bin and one from left bin) and position in assembly with precision. Distances within reach.
RH A 1B 0G 1A 1B 0P 6A 0= 90 TMU
LH A 1B 0G 1A 1B 0P 6A 0= 70 TMU
零恩工业工程咨询Combination of GM and CM
A 1
B 0G 1 A 1B 0P 3F 16A 1B 0P 1A 0= 240 TMU Pick up a screwdriver from the table within reach and place it on the head of a screw, turn down the screw 9 wrist-turns and set aside tool.
A 1
B 0G 1 A 1B 0P 3
= 60 TMU A 0B 0G 0 M 1X 0I 0A 0= 10 TMU
A 0B 0(G 1 M 1) X 0I 0A 0(8)= 160 TMU
A 0B 0G 0 A 1B 0P 1= 20 TMU 250 TMU
零恩工业工程咨询Rule of Multiple Fasteners ABG AB (P A 0F) ABP A ( )ABG AB (P A 1F) ABP A ( )
Distance Between Fasteners
<2”> 2”
Is walking required to Put
tool/object?
NO
ABG A 1B (P A 0F) ABP A ( )ABG A 0B (P A 1F) ABP A ( )
Yes
ABG A x B (P A 0F) ABP A ( )
x = index value for # of steps ABG A x B (P A 1F) ABP A ( )x = index value for # of steps
零恩工业工程咨询Balancing Time
•Balancing effect results from the combination of individual deviations (+ and -) for a smaller total deviation.0.00
0.05
0.10
0.150.200.25
0.30
S a m p le s
T i m e C u m u la tiv e A v g
V a lu e s
S ta n d a r d
S t a n d a r d s A c c u r a c y
零恩工业工程咨询Balancing Time
•Balancing time is the time needed for the system ’s desired level of accuracy to be attained.
•Minimum amount of work analyzed before accuracy can be guaranteed to a specific confidence level. Balancing Time for MOST = 3235 TMU, approximately 2 minutes.
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