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With this new version of the MTM, the goal is to make it the fastest MTM system.

Introduction

The UAS system, Universal Analysis System,is introduced by the German association MTM en 1980. The system is a variant of the Mercedes system called C-Werte. With this new version of the MTM, the goal is to make it the fastest MTM system. Less ” accurate ” than the MTM-1, this new system covers operations where cycle times are several minutes (+/-15 minutes) and/or mass production operations that generally have the following characteristics1 :

  • Operators with a good control of operations
  • Operations are standardized and controlled
  • A good level of general organization
  • A clear production flow
  • A repetitive cycle

Principle

The MTM-UAS is based on 7 categories of movements, called the basic Level 3 operations built from the MTM1. These are the universal movements applicable to all industries and all operations:

  1. Grasp and Put: The distance and Shape of the object are taken into account. It will be held that this table is built from the movements reach, grasp, move and position. Note that if movements of the body or another action (make a visual check…) are interspersed in this movement, they will have to be analyzed apart.
  2. Put: After an action to take and drop the object, most often one will have to position it in a more or less precise way.
  3. Tools handling: use pliers, screwdrivers…
  4. actuate: Press a button, a lever…
  5. Repetitive motion: All movements, most generally of low effort, are movements carried out continuously during the task.
  6. Body Movements: Movement to move.
  7. Visual Control: Action of the head and eyes to control an element.

A higher level of detail, Level 4, is also found for movements called ” standard operation “. One is more interested in the function of the operation (gluing, unpacking, screwing, cleaning…) rather than the general movement and have built it from level 3. For example, the action of unpacking and unpacking (open a carton with a sharp object), is constructed with the tools Handling tables, place (on a container), repetitive motion, take and evacuate the container.

We can go even further, Level 5, 6… to go in more detail on each of the movements.

The rules

As with the other versions of the MTM, some rules apply for a good use of the method.

For the table Grasp and put

There are different rules to properly codify the movement. If the object is too large, 1 length to more than 80cm or 2 lengths longer than 30cm, it will be classified in the immediately superior weight category.

If this volume constraint is, in addition, attached with difficulty to grasp it, it will be allocated the difficulty class for the objects with the heaviest weight (8 to 22kg).

It is also defined 3 levels of difficulty for the Graps, defined according to the following table:

Easy

Difficult

With strength

Isolated Object

Mixed object among others

Mixed and stacked objects

This category corresponds to the following movements of the MTM1 :

G1A: Taking an object by simply closing your fingers

G1B: Take a very small object (Section < 3mm2).

G5: Contact input, partial control of an object.

This category corresponds to the following movements of the MTM1 :

G1C: Graps An object that cannot be done simultaneously from underneath and sideways.

G4: Grasp an object that is mixed with others so that there is a search and selection.

For the Grasp and put table, and the put table

At these two tables are allocated a criterion of precision of the level of investment necessary to accomplish the task. These criteria are approximate, Simple or accurate and are defined in the following table:

With adjustment

Without adjustment

Approximate

More than 12mm play

Tolerance of more than 6mm

Sinple

Play less than 12mm without pressure or help

Tolerance between 1.5 and 6mm

With precision

Play less than 12mm with pressure or help

Tolerance of less than 1.5 mm

Simultaneous movement

In the same way as for the other MTM, one considers that one cannot make all types of movements at the same time with the left hand and the right hand. To govern this, the MTM-UAS offers a table of simultaneity below:

Right hand

With control or with effort

Without control and with effort
Left hand With control or with effort No simultaneity

Possible simultaneity:

Note the two movements independently and take the one with the most important time

Without control and with effort

Possible simultaneity:

Note the two movements independently and take the one with the most important time

Range of motion

A the whole of the tables is added a criterion of amplitude of motion (distance of movement…). There are 3 amplitude classes that we describe below:

  1. Maximum movement of 20 cm
  2. Movement of more than 20 cm but less than 50 cm (inclusive)
  3. Movement more than 50cm but less than 80cm

Source

MTM-UAS-1995 – Instructor Manual

M. Cakmakci, M. Kemal Karasu (2007) – Set-up time reduction process and integrated predetermined time system MTM-UAS

R. Beno, P. Markova, L. Smida, P. Sakal (2012) – Applying the MTN

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