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The MOST is a method of predetermination of time. Simpler and above all faster than MTM, it is based on standard sequences and the fact that most of the work is done with objects.

Introduction

The Maynard Operation Sequence Technique was developed in the years 1980 by Z. Zandin. Based on the principles of MTM, it has the challenge to reduce the time of analysis, judged very long of the MTM.

The theory of this method is based on the fact that the working time corresponds to the movement time of the objects and not to the time when basic movements are carried out (the Therbligs)1. The set of movements and sequences therefore focuses on the movement of objects to perform tasks.

How to use

The use of the MOST methodology follows a procedure close to other methods of predetermination of times such as MTM.

  1. Determine the working perimeter: Identify the cycle, its start and end point, and the various tasks included. This process must be standardized and shared by all.
  2. Cut tasks in sequence: you have to understand all the tasks performed and cut them in a logical way.
  3. Choose which version of the most methodology is most suitable: It is necessary to choose which version of MOST according to the criteria of duration of operations and level of detail we want.
  4. Analyze each sequence using the MOST standard: proceed to the identification of sequences of each of the operations this according to the standards of most.
  5. Assign values for each sequence parameter: identify the set of values for each of the sequence letters. It may be that in the sequence a letter is not used. In this case, assign it a value of 0.
  6. Deduct the time value for each of the steps and deduct the Normal time: Add all the values of the index of the different movements and apply the multiplier coefficient. 1 for the MiniMOST, 10 for the BasicMOST and 100 for the MaxiMOST.

The different sequences of the BasicMOST

To reduce the time of analysis compared to MTM, the methodology proposes to group the movements in sequence of work. The following sequences are found:

General movements

Generally representing more than 50% of total activities2, they are movements of objects freely carried out in space. The following elements are found:

  • A, Action Distance: All movements or actions carried out in space by fingers, hands (with or without object), feet.
  • B, Body Motion: All the movements or vertical actions carried out by the body.
  • G, Gain Control: Take control of an object with your fingers, hands or feet and release it after moving. This parameter includes small movements to take full control of the object.
  • P, Placement: The final stage of a move consisting of alignment, orientation, or assembly of the Part with another.

The sequence

Moving an object in space requires you to follow 3 different phases that are performed in a defined sequence: ABG ABP a

  • ABG is a phase to take an object. It corresponds to a GET action of the MTM.
  • ABP is the phase describing a movement of an object from a position A to a B position. It corresponds to a PUT action of the MTM.
  • Finally, the A is the phase to describe the fact of returning to the initial position. Systems

Example

Let’s take a sequence where the worker walks 5 steps, takes a small Part on the floor, returns to its original position and places the Part on the workspace.

Solution: A10b6G1a10b P1a0 which gives us a value of 28 Index * 10 or 280 TMU

The frequency factor

Sometimes a specific movement is repeated several times in the same sequence. We will note this notion in parenthesis.

Example

An operator takes a handful of screws to position them on the 3 bolts located at 12cm from there. The sequence is as follows:

A1 b0 G3 (a1 b0 P1) a (3)

A total of 100 Tmu

Controlled movements

These are all movements where objects remain in contact with a surface or with another object:

  • M: movements guided by a trajectory, a plane… (An object that slides on a surface for example).
  • X: time of the actions carried out by machines and without manual actions.
  • I: manual action or end of a machine cycle to finalize the alignment of an object.

The sequence

In the same way, the whole concept of most, controlled movements follow a standard sequence: ABG MXI A

  • ABG is the phase to grab an object.
  • MXI is the phase to describe the movement of the object as an alignment, a positioning…
  • A is the phase to describe the fact of returning to the initial position.

Example

A 2 step operator, grasped at the hip the turn lever, activates the 15cm lever to engage the tool and launches the cycle time of 25 sec.

Solution: A3B G1M1X70I A which gives us a value of 75 index * 10 = 750 TMU or 27 seconds.

The use of tools

This movement group represents all the movements associated with the use of the tools. The sequence is as follows: ABGABP * ABPA. We find:

  • F/L: assembly or disassembly of an object using hands, fingers or a hand tool.
  • C: separate, divide or remove part of an object with a cutting tool.
  • S: remove particles from an object or apply a substance to an object.
  • M: determine a certain physical characteristic of an object.
  • A : manual action performed with a pen or marker to raise information.
  • T: action of the eyes or reflections to obtain information or inspect an object.

The sequence

Here too, the most methodology works on the basis of a standard sequence, which in this case is: ABG ABP * ABP A

  • ABG to enter the tool
  • To put the tool in position
  • * is the to identify the type of task performed with the tool: F/L, C, S, M, R, or T
  • To put the tool farther, usually in its storage
  • A is the sequence to describe the fact of returning to the initial position.

Transport with a specific means

This group defined all the ” short ” transports either manual (truck…) or motorized (crane…). We find:

  • T: Transport with empty medium
  • K: Hooking or unhooking the object
  • F: Area congestion level
  • V: Vertical Motion
  • L: Transport with the loaded medium
  • P: Place, Position

The sequence

There are 2 types of sequences depending on the type of means of transport:

  • ATK FVL VPT A: sequence for manual modes of transport (truck…)
    • ATK: To go to the object with the medium and hang the object on the way
    • FVL: To transport the object to the final point
    • VPT: To position the object
    • A: To return to the starting point with the means
  • ATK TPT A: sequence for motorized means of transport (crane…)
    • ATK: To go to the object with the medium and hang the object on the way
    • TPT: To transport the object to its point of arrival
    • A: To return to the starting point with the means

Source

1 – J. P. Tanner (1991) – Manufacturing Engineering: An introduction to the basic functions

2 – S. S. Patil, B. M. Shinde, R. S. Katikar, M. V. Kavade (2004) – MOST, an advanced technique to improve productivity

R. M. Belokar, Y. Dhull, S. Dwarf, S. Nain (2012) – Optimization of time by elimination of unproductive activities through MOST

B. W. Niebel, A. Freivalds (1999) – Predetermined Time systems

S. Bolle, J. De Ridder (2011)-Benchmarking Studie van Mcwps System

R. Crowson (2006) – Factory Operations, planning and instructional methods

R. Crowson, J. Walker (1996) – Handbook of manufacturing Engineering

K. B. Zandin (2003)-MOST Work Measurement Systems

W. C. Wong (2011) – MOST Work measurement system

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