mtm and motion economy in industrial engineering

8/13/2019 MTM and Motion Economy in Industrial Engineering

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Methods Time Measurement

PMTS technique Developed in 1940 in USA by

Harold B. Mynard

G. J. Stegemererten

John L. Schwab

Implementation of Lean Line conceptsin PE Pump Assembly lines 2

Reach

Grasp

MovePosition

Release


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Influencing variables: Length of motion Level of control

Case of motion Reach is basic motion of moving the fingers or hand to definite or

indefinite location Length of motion, case of motion

Grasp sufficient control of one or several objects is gained with thefingers or hand, so that next basic motion can be performed. Type of grasp, location of the objects, dimension of the object

Move one or several objects are transported to a destination with thefingers or the hand Length of motion, case of motion, effort

Position is an accuracy allowance to move in order to engage or line upone object with another Class of fit, symmetry condition, ease of handling

Release relinquishes control of an object from the hand or the fingers Case of motion



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Work methods and processes times can be determined in detail beforestarting work.

MTM require a complete methods analysis prior to setting the standard.Each motion must be identified. Obvious methods problems and otherinefficiencies are readily identified by detailed study of the workmethod being used.

MTM systems do not require the analyst to perform performance rating.This eliminates some subjectivity from the resulting standard and

provides a more consistent standard. In order to develop work standards using a direct observation method,

the work must be measured while it is being performed. MTM systemallows the analyst to visualize the work and synthesize the standardeven if the task is still in the planning phase.

MTM procedures follow coding of basic motions which leads to a

globally identical and reproducible description. Better process planning allows for cost reduction Based on the methods described in the MTM analysis, Work instructions

can be framed.



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The MTM 1 system is applicable to manualoperation.

Mental work in the strictest sense cannot be

analyzed Times for processes, which can be limited to a

limited degree or which cannot be influencedare generally determined by timings

MTM -1 has many rules associated with theproper application of times.



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Use of Human Body.

Arrangement of the workplace.

Design of tools and workplace.


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When possible: The two hands should begin and complete their

movements at the same time.

The two hands should not be idle at the same time exceptduring periods of rest.

Motions of the arms should be symmetrical and in oppositedirections and should be made simultaneously.

Hand and body motions should be made at the lowest

classification at which it is possible to do the worksatisfactorily.

Momentum should be employed to help the worker , butshould be reduced to a minimum whenever it has to beovercome by muscular effort.


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Continuous curved movements are to be preferred tostraight line motions involving sudden and sharp changesin direction.

Free swinging movements are faster, easier and moreaccurate than restricted or controlled movements.

Rhythm is essential to the smooth and automaticperformance of a repetitive operations. The work should bearranged to permit easy and natural rhythm whenever

possible.

Work should be arranged so that eye movements areconfined to a comfortable area, without the need forfrequent changes of focus.


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When possible:

Definite and fixed stations should be provided for all toolsand materials to permit habit formation.

Tools and materials should be pre-positioned to reducesearching.

Gravity feed, bins and containers should be used to deliverthe materials as close to the point of use as possible.

Tools, materials and controls should be located within themaximum working area and as near to the worker aspossible.

Materials and tools should be arranged to permit the best

sequence of motions.


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Ejectors should be used whenever possible, so that theoperator does not have to use his or her hands to dispose ofthe finished work.

Provision should be made for adequate lighting, and a chairof the type and height to permit good posture should beprovided.

The colour of the workplace should contrast with that ofthe work and thus reduce eye fatigue.


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When possible:

The hand should be relieved of all work of holding thework piece where this can be done by jig, fixture or foot-

operated device. Two or more tools should be combined whenever possible.

Where each finger performs some specific movement, theload should be distributed in accordance with the inherent

capacities of the finger. Handles such as those on cranks and large screwdrivers

should be so designed that as much of the surface of thehand as much as possible can come in to contact with thehandle.


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Levers, crossbars and hand wheels should be so placed thatoperators can use them with the least change in bodyposition and the greatest mechanical advantage.

mtm and motion economy in industrial engineering

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