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IE 327 Introduction to Work Design Dr. Andris Freivalds Class #26

IE 327 Introduction to Work Design Dr. Andris Freivalds Class #26. Ch. 18 – Learning Curves. Install New Method (5 th step in Methods) Training operators in new method “Learn-on-the-job” approach Simple written instructions Pictorial instructions Videotapes

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IE 327 Introduction to Work Design Dr. Andris Freivalds Class #26

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  1. IE 327 Introduction to Work Design Dr. Andris Freivalds Class #26 IE 327

  2. Ch. 18 – Learning Curves • Install New Method (5th step in Methods) • Training operators in new method • “Learn-on-the-job” approach • Simple written instructions • Pictorial instructions • Videotapes • Physical training, simulators • Account for learning curve – improve over time IE 327

  3. Learning Curve - 1 As #cycles doubles, cycle time ↓ by constant % IE 327

  4. Learning Curve - 2 IE 327

  5. Learning Curve - 3 IE 327

  6. Learning Curve - 4 • Power curve: y = kxn • Take log • Solve for n (slope) • Solve for k • Final eq.: IE 327

  7. Learning Curve - 5 • % learning = 2n • n = log (learn ratio) log 2 • Typical %learning: • Large assembly: 70-80% • Welding: 80-90% • Machining: 90-95% IE 327

  8. Learning Curve - 6 • When is std. time of 2 min. achieved? IE 327

  9. Learning Curve - 7 • How long do 262 cycles take? • Total time = k[(x2+½)n+1 – (x1-½)n+1]/(n+1) IE 327

  10. Ex. 18-1 • Given two points, find learning curve (50th cycle = 20 min, 100th cycle = 15 min) • What is %learning? IE 327

  11. Ex. 18-1 con’t • How many cycles to reach std. time of 10 min? IE 327

  12. Ex. 18-1 con’t • How long do 265 cycles take? • Average cycle time = • Use DesignTools!!! IE 327

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