Predetermined%20Time%20Systems

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Predetermined Time Systems

• IENG 311
• Work Methods Measurement
• Carter J. Kerk, PhD, PE, CSP, CPE

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Predetermined Time Systems

• PDTS
• Read Chapter 29 from Konz Johnson, 6th Edition
• HW29
• Review Questions, p. 580
• Due Monday 10/2

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Objectives - PDTS

• Describe the general concept of PDTS
• Understand the difference between PDTS and other
  standard data systems
• Understand the procedure for calculating a time
  standard with PDTS
• Know the advantages and disadvantages of using a
  PDTS for setting time standards

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Introduction

• There are times when it is not possible or
  practical to set time standards using time study.
• You may want to use Standard Data (Chapter 30) or
  Pre-Determined Time Systems (This chapter!)

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Therbligs

• Frank and Lillian Gilbreth took a detailed look
  at work and broke work into 17 micro-elements,
  called Therbligs
• They used Therblig analysis to perform
  micromotion analysis of tasks (yes, they did this
  in the early part of the 1900s)
• They used it to analyze bricklaying (a 2000
  year-old task) and were able to increase
  productivity by 300

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Therbligs

• G Grasp
• P Position
• PP Pre-position
• U Use
• A Assemble
• DA Disassemble
• RL Release Load
• TE Transport Empty
• TL Transport Loaded

• SH Search
• ST Select
• H Hold
• UD Unavoidable Delay
• AD Avoidable Delay
• R Rest
• PN Plan
• I Inspect

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The Concept of PDTS

• Take basic, fundamental, universal units of work
• Attach standard amounts of time
• MTM Methods Time Measurement
• MOST (Maynard Operational Sequence Technique)
• MODAPTS

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MTM

• MTM-1 Basic and most detailed version
• 250 times the cycle time to analyze the task
• Simplified Versions of MTM (less accurate)
• MTM-2 100 times the cycle time to analyze the
  task
• MTM-3 35 times the cycle time to analyze the
  task

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MTM - 1

• Motions are broken into 20 categories
• Reach, Move, Turn, Apply Pressure, Grasp,
  Position, Release, Disengage, Body Motions
  (leg-foot, horizontal, vertical), Eye Motions
• Times for each motion is given in TMUs (see
  next slide)
• Times are for experienced operators working at a
  normal pace (100)
• No allowances are included

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MOST

• Maynard Operational Sequence Technique
• Developed in Sweden by Zandin
• The vast majority of activities involved with the
  handling of an object were associated with a
  limited number of motion sequences
• By taking advantage of this point, the time
  required to perform an analysis is significantly
  reduced from that required by MTM without a
  reduction in precision.

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MOST

• Four Sequence Models
• General Move, Controlled Move, Tool Use, Manual
  Crane
• MiniMOST
• for short-cycle, highly repetitive operations
• This system requires more time
• MaxiMOST
• For long-cycle times, with many non-identical
  operations

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MOST

• Basic MOST
• General Move Sequence
• Three components Get, Put, Return
• Example
• GET A1 B0 G1
• PUT A1 B0 P3
• RETURN A1
• See next slide for General Move Model

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What is a TMU?

• TMU Time Measurement Unit
• 1 hour 100,000 TMU
• 1 minute 1667 TMU
• 1 second 27.78 TMU
• 0.00001 hour
• 0.0006 minutes
• 0.036 seconds