Modular Arrangement of Predetermined Time Standards
Modular Arrangement of Predetermined Time Standards 内容简介
Techniques for studying work methods Work is divided into micro elements that are standard in any activity These micro elements are represented by symbols. Note that in MTM system these symbols are called therbligs. Determine all the symbols in a work process Assign standard time values to each micro movement Total up the times to find total time/task (Assuming additivity and independence) Movements and terminal activities take place in pairs. Movement first then terminal activities Move to get, move to put Examples: M3GO (move to touch) Movement activities are classified by: Distance moved Body part required to perform the move Light/small objects vs. heavy/large objects Large objects : 16” x 16” x 16” Heavy objects : over 18 lbs. Award the lowest category that is possible to successfully complete the activity M1 Movements Rub your thumb and index finger together Depressing keys – M1P0 Squeezing trigger – M1P0 M2 Movements Following a body move: 5 x W5, M2G1 Positioning of a washer: M4G3 M2P5 M3 Movements Turning over the page Draw a free hand line approximately 6 inches long How about half an inch long? M4 Movements An imaginary 45 degree cone Move forward 18” (inside the cone) M5 Movements Outside imaginary 45 degree cone Reaching up to an object from a high shelf – M5P2 Moving an object across the body – M5P0 M7 Movements Fully up, down, or across the body (hinged at the waist) Picking up objects from the floor M7G1 M7P0
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