Predetermined Time Systems

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Predetermined Motion Time System

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- Based to some extent on Gilbreths therbligs
- refined by micromoton analysis and synthetic rating
- assume that work elements are independent and additive
- Resulting standards are for a "typical motivated, trained & fit worker" at 100% pace
- Standards can be created at the desktop based on info on method and workplace

Cautions:
need to verify conditions, tools, methods etc to avoid missing something
use appropriate system according to the task usually based on duration and repetition of the activity

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Therbligs

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set of fundamental motions required for a worker to perform a manual operation or task
(search, find, select, grasp, hold, position, assemble, use etc)

Used in the study of motion economy in the workplace
workplace is analyzed by recording each therblig unit, with the results used for optimization of manual labor by eliminating unneeded movements

Front 3

MTM (Methods Time Measurement)

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1) most detailed and can be used for any task
2) less detailed requiring more judgement by analyst
3) even less, and much quicker to apply
4) Specialized version: MTM-V, MTM-C, MTM-M etc

Front 4

MOST (Maynard Operation Sequence technique)

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Basic Most : For general use
Mini-Most: For highly repetitive tasks
Maxi-Most: for long cycle, non repetitive tasks

Front 5

Common Predetermined motion time Systems

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MTM
MOST

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MTM-1

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Developed by Maynard, Stegemerten & Shwab (1946)
From motion pictures of sensitive drill press operations at Westing house
Motions broken down into 10 categories
Each category has different levels of movement
Move:
1) Move object to other hand or against stop
2) Move object to an approximate or indefinite location
3) move object to exact location

Shorthand for a 5-inch case C Move is M5C

Front 7

MOST

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Based on MTM data
reduced analysis time (compared to MTM)
Times estimated from ranges of motions rather than precise measurements
Requires minimal paperwork
Consistent, widely accepted
encourages methods improvement

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MOST: Sequence Model

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General Move: 3 phases
Get - ABG
Put - ABP
Return - A

A = action distance
B = body motion
G = Gain control
P = Placement

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MOST: Sequence Indexing

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Each parameter has an index that gives us a time
-Index based on application rules
-summed an multiplied by 10 gives us time in TMU

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MOST: Common sequence Models

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General Move
Controlled Move
Tool Use

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MOST: General Move

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Manual movement of an object freely (open space non restricted path)

get an object, place it, and return it
ABG ABP A

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Most: Controlled Move

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Manual displacement of an object over a controlled/restricted path

Get an object, move or actuate it and return
ABG MXI A

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Most: Tool Use

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Combines General and Controlled Move in typical use of tools
Get a tool, place it for use, use, put aside, return
ABG ABP F ABP A

Two Types
Fasten/loosen
Cut,surface treat, record, think, meaure

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Most analysis

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Break the task down into steps involving movement of an object (i.e whether General, controlled, or tool)
Apply appropriate time values for each parameter
Total the time for sub operation
Analysis
Use the MOST Data Card
Use MOST for Windows

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Applying MOST

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Paper Pencil
Write out sequence, select parameter index values
Use Most analysis form for multiple sequences in a task

Windows
Supports BasicMost, MiniMOST, MaxiMOST
Stores sub-operations in database, prints reports

Direct Most:
enter method description & index using drop down boxes
can link to work area drawings to generate distances

Quick Most:
drag and drop MOST elements into a method