Chapter 11: Predetermined Time Systems

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Chapter 11 Predetermined Time Systems

• Overview
• Predetermined Time Systems
• Methods-Time Measurement (MTM)
• Maynard Operation Sequence Technique (MOST)
• Basic Motion Times Application

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Predetermined Time Systems
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Methods-Time Measurement (MTM)

• Methods-Time Measurement gives time values for
  the fundamental motions of reach, move, turn,
  grasp, position, disengage, and release
• MTM is a procedure which analyzes any manual
  operation or method into the basic motions
  required to perform it and assigns to each motion
  a pre-determined time standard which is
  determined by the nature of the motion and the
  conditions under which is made
• MTM-1 data are the result of frame-by frame
  analyses of motion-picture films of diversified
  areas of work
• 1TMU 10-5h

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Methods-Time Measurement (MTM)

• MTM-2 is a system of synthesized MTM data and is
  the second general level of MTM data
• Consist of
• Single basic MTM motions
• Combinations of basic MTM motions
• Applications
• Work cycle gt1
• The cycle is not highly repetitive
• manual? not complex or simultaneous hand motions
• Classifications 11 classes of actions
• Special situations
• Principle of simultaneous motions
• Principle of limiting motions
• Principle of combined motions

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MTM-2 System
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MTM-2 System
MTM-2 classes of actions
MTM-2 simultaneous hand motion allowances
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Methods-Time Measurement (MTM)

• MTM-3
• Save time at the expense of some accuracy
  5,95
• Not use for operations eye focus, eye travel
  time
• 4 categories of manual motions handle,
  transport, step and foot motions, bend and arise
• MTM-V
• Use in metal cutting operations
• To establish setup time for all typical machine
  tools
• MTM-C
• Use in baking and insurance industries,2-level
  system
• To establish time standards for clerical-related
  works

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Methods-Time Measurement (MTM)

• MTM-M Use for evaluating operator work using a
  stereoscopic microscope
• Other specialized MTM systems
• MTM-TE electronic test, 3-level
• MTM-MEK electronic test, 3-level, small-lot
• MTM-UAS describe process, determine allowed
  times for batch production, 3-level system
• MTM systems comparison
• Criteria accuracy, number of therbligs utilized,
  time to analyze a job (at 90 confidence level)
• MTM-2 is the best

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Maynard Operation Sequence Technique (MOST)

• A simplified system fast establish time
  standards
• MOST identifies 3 basic sequence models
• General move free object movement through the
  air
• Controlled move object remains contact with
  surface or attached to another objects during
  the movement
• Tool use use of common hand tools
• Two adaptations Mini and Maxi MOST
• Mini MOST identical, short-cycle operations
• Maxi MOST long-cycle operations
• Both manual and computerized versions

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Basic Motion Times Application

• Standard data development
• Fast
• Reduce clerical errors less arithmetic
• Establish standards on indirect works
• long cycle, complex operations
• Method analysis
• Easy to develop a motion/methods
  analysis?numerical detail, better ways of
  eliminating ineffective therbligs, reduce times
  on the remaining therbligs
• Simplify the method
• Elimination of body motions
• Eliminate operations that require eye travel and
  eye focus
• Pre-positioning tools, parts and materials