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IE 419 Work Design: Productivity and Safety Dr. Andris Freivalds Class #12

IE 419 Work Design: Productivity and Safety Dr. Andris Freivalds Class #12. IE 419 Work Design: Productivity and Safety Dr. Andris Freivalds Class #12. Use MTM-2 When:. Cycle time > 1,600 TMUs (~ 1 min → 5%) Cycle is not highly repetitive No complex finger motions used

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IE 419 Work Design: Productivity and Safety Dr. Andris Freivalds Class #12

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  1. IE 419 Work Design:Productivity and Safety Dr. Andris Freivalds Class #12 IE 419

  2. IE 419 Work Design:Productivity and Safety Dr. Andris Freivalds Class #12 IE 419

  3. Use MTM-2 When: • Cycle time > 1,600 TMUs (~ 1 min → 5%) • Cycle is not highly repetitive • No complex finger motions used • Ex: dealing a deck of 52 cards • Time = • Repetitive = • Finger motions = IE 419

  4. 9 Elemental Motions • GET (G): gain control of object • Reach for an object • Grasp object • (eventually) Release object • PUT (P) = move object (when under control) to new location • Move object to new location • Position object to proper location IE 419

  5. Variations of GET & PUT • Case = type of grasping or correcting motion, amount of control needed • Distance reached • Weight of object or resistance • Type of PUT • Insertion difficulty (one object into another) • Surface alignment IE 419

  6. Cases for GET(G) IE 419

  7. Cases for PUT (P) IE 419

  8. Clearances (in.) for Insertion vs. Alignment PUT IE 419

  9. Distance Code * >32 → step IE 419

  10. Weight Factor • If significant weight moved, additional time is needed • GET Weight (GW) = + 1 TMU for each 2 lbs up to 40 lbs • Values are per hand (20 lb box → 5 TMU) • PUT Weight (PW) = + 1 TMU for each 10 lbs (above 4 lbs) up to 40 lbs • Resistance: Ffriction = 0.4 N IE 419

  11. Other Elemental Motions - 1 • Apply Pressure (A) = 14 TMU • Exert muscular force on object • Without moving it (otherwise G or P) • Ex: push button • Regrasp (R) = 6 TMU • Change position of object • Without relinquishing control (otherwise G) • Ex: reorient tool IE 419

  12. Other 7 Elemental Motions - 2 • Eye Action (E) = 7 TMU • Recognize an object or • Shift line of sight out of normal area of vision • Don’t overdue, G and P have already • Crank (C) = 15 TMU/rev • Hand/fingers move in circular path > ½ rev • If < ½ rev, use G and/or P • May need GW to overcome stiction • May need PW for sticky crank IE 419

  13. Other 7 Elemental Motions - 3 • Steps (S) = 18 TMU/step • Leg motion to move body, • Distance > 12” • Foot Motion (F) = 9 TMU • Short foot motion, to press pedal • Distance < 12” • Bend & Arise (B) = 61 TMU • Vertical displacement of body • Squat, stoop, kneel on one knee • Kneel on both knees = 2B IE 419

  14. MTM-2 Application • Use MTM Methods Analysis Chart • Summarize motions by hand (L & R) • Add TMUs (no ratings needed) • Add allowances • Consider special cases IE 419

  15. Summary of MTM-2 Data IE 419

  16. Insertion vs. Alignment PUT IE 419

  17. Continuous vs. Intermittent Crank IE 419

  18. 1) Simultaneous Motion • Simo difficult motions require more time • Add a penalty IE 419

  19. Other Special Cases • Principle of limiting motion • For two different motions for each hand • Use the longer time • Principle of combined motion • For two combined motion in one hand • Use longer time • R is included in C-type motions IE 419

  20. Examples IE 419

  21. Sources of Error • Discreteness – tabular data • No interpolation • Hopefully, this averages out • Synthesis assumes correct process • Need correct application - practice IE 419

  22. Comparison of MTM and Time Study IE 419

  23. Ex: U-bolt (Cable clamp) assembly IE 419

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