Description of Predetermined motion time systems (PMTS) MTM-2 Categories, Data Decision model

Description of Predetermined motion time systems (PMTS) MTM-2 Categories

GET(G)

Action of reaching out with hand or fingers to an object, grasping the object & subsequently releasing it.

The scope of GET            

Starts: With reaching out to the object,

Includes: Reaching out to, gaining control & subsequently releasing control of the object

Ends: When the object is released

Three variables of GET Selection:

• Case of GET—distinguished by the grasping action employed
• Distance reached
• Weight of the object or its resistance to motion

GET decision model

Example

• GA - putting the palm of the hand on the garments to push it across the table
• GB - getting an easy-to-handle object, taking arranged rib to join with sleeve.
• GC – taking body for neck join, need to get the body on a specific point from where neck join will start.

GET WEIGHT (GW)

Action required for the muscles of hand to take up the weight of the object

The scope of GET WEIGHT      

Starts: with the grasp on the object completed

Includes: muscular force necessary to gain full control of the weight

Ends: when the object is sufficiently under control to permit movement.

GW occurs after the fingers have closed on the object in the preceding GET

• When weight is less than 2 kg per hand, no GW is assigned
• When resistance exceeds 2 kg, 1 TMU is assigned for every kg including the first two.

PUT (P)

Action of moving an object to a destination with the hand or fingers.

The scope of PUT

Starts: with an object grasped & under control at the initial place

Includes: all transports & correcting motions necessary to place an object

Ends: with object still under control at the intended place

Three variables of PUT Selection:

• Case of PUT—distinguished by the correcting motions employed
• Distance moved
• Weight of the object or its resistance to motion.

Put decision model

Example

• PA - tossing aside a garments.
• PB - putting a garments on a carton serially.
• PC – inserting a button to button sewing machine button clamp.

PUT WEIGHT (PW)

An addition to a PUT motion depending on the weight of the object moved.

The scope of PUT WEIGHT

Starts: when the move begin

Includes: differences in time required in moving heavy & light objects over the same distance

Ends: when the move ends.

• When weight is less than 2 kg per hand, no PW is assigned
• Between 2 kg & 5 kg, 1 TMU is allowed; between 5 kg & 10 kg 2 TMU are allowed; & so on.

REGRASP (R)

Action with the purpose of changing the grasp on an object

The scope of REGRASP

Starts: with the object in the hand

Includes: digital & hand muscular readjustment on an object

Ends: with object in a new location in the hand

• REGRASP consists of not more than three fractional movements
• If the hand relinquishes control & then secures another grasp on the object, the action will be a GET, not a REGRASP.

Example

• Changing the grasp on a pencil in order to get into the position for writing to write bundle card.

APPLY PRESSURE (A)

Action with the purpose of exerting muscular force on an object

The scope of APPLY PRESSURE

Starts: with the body member in contact with the object

Includes: a minimum reaction time to permit the reversal of force & the subsequent releasing of muscular force

Ends: body member in contact with object, but muscular force released.

• The minimum dwell time covers mental reaction time only
• Apply muscular force on an object to achieve control, restrain or overcome resistance to motion
• The object is not displaced more than 6 mm

Example

• Lock pin close of price tag attach.

EYE ACTION (E)

Action with the purpose of

- Recognizing a readily distinguishable characteristic of an object
- Shifting the aim of the axis of vision to a new viewing area

The scope of EYE ACTION

Starts: when other actions must cease because a characteristic of an object must be recognized

Includes: recognize a distinguishable characteristic of an object or shift the aim of the axis of vision to a new viewing area

Ends: when other actions can start again.

• A single eye focus covers an area 10 cm in diameter at 40 cm

Example

• Action of determining whether a garment is showing top side or inside.

FOOT MOTION (F)

A short foot or leg motion when the purpose is not to move the body

The scope of APPLY PRESSURE

Starts: with the foot or leg at rest

Includes: a motion not exceeding 30 cm

Ends: with the foot in a new location

STEP (S)

A leg motion with the purpose of moving the body or longer than 30 cm

The scope of STEP

Starts: with the leg at rest

Includes: a leg motion to displace of trunk or longer than 30 cm

Ends: with the leg at a new location

• FOOT MOTION & STEP are judged by the decision model.

STEP & FOOT MOTION decision model

For walking, count the number of times the foot hits the floor

Example

• F - Pressing the foot pedal of sewing machine.
• S - Making a single step to the side to operate multiple machine by single operator.

BEND & ARISE (B)

Lowering of the trunk followed by a rise

The scope of BEND & ARISE

Starts: with motion of the trunk forward from an upright posture

Includes: trunk movement to reach below knees & the subsequent arise of hand

Ends: with the body in an upright posture

Example: 

• Putting a garment from floor.

CRANK (C)

Moving an object in a circular path more than half revolution with hand or finger

The scope of CRANK

Starts: with the hand on the object

Includes: all transporting motions required to move an object in a circular path

Ends: with the hand on the object when one revolution is completed.

Example: 

• Turning hand wheel of sewing machine through one revolution