Therbligs are 18 types of elemental movements used in the study of motion economy in the workplace. Tasks at work are analyzed by recording each therblig unit for a process, with results used to optimize manual work by eliminating unnecessary movement.
The word therblig is the creation of Frank Bunker Gilbreth and Lillian Moller Gilbreth, the American industrial psychologist who invented the field of time and study of motion. This is a reversal of the name Gilbreth , with 'th' diverted.
Video Therblig
Basic motion elements
A element of basic motion is one of a series of fundamental moves required for a worker to perform operations or manual tasks. The set consists of 18 elements, each describing a standard activity.
- Carries empty [not loaded] (TE): receives object empty-handed. (Now called "Reach")
- Grasp (G): holds the object with the active hand.
- Load loaded (TL): move objects using hand gestures.
- Hold (H): holds an object.
- Release load (RL): releases object control.
- Preposition (PP): position and/or object orientate for subsequent operations and relative to the approximate location.
- Position (P): position and/or orientate the object in the specified location.
- Use (U): manipulate the tool in the way it was intended during the training.
- Assemble (A): merge the two parts together.
- Disassemble (DA): separates some of the merged components.
- Search (Sh): try to find objects using eyes and hands.
- Select (St): choose between multiple objects in the group.
- Plan (Pn): Decide an action.
- Inspect (I): determine the quality or characteristics of an object using the eyes and/or other senses.
- Unavoidable delay (UD): waiting for factors beyond the control of the worker and included in the duty cycle.
- Unavoidable delay (AD): wait in the worker's control causing laziness not included in the regular work cycle.
- Rest (R): resting to overcome fatigue, consisting of pauses in hand movement and/or body during the work cycle or between them.
- Find (F): A momentary mental reaction at the end of the search cycle. Rarely used.
Maps Therblig
Effective and ineffective base motion elements
Usage examples
Here's an example of how therblig can be used to analyze movements:
... Suppose a man walks into the bathroom and shaves. We will assume that his face is all foamy and he is ready to take his razor. He knew where the razor was, but first he had to find it with his eyes. It was a "search", the first Therblig. His eyes found it and came to rest - it "finds", the second Therblig. Third came "select", the process of shearing razor before Therblig fourth, "grasp." The fifth is "transport loaded," carrying a razor to his face, and the sixth is "position," getting a razor on his face. There are eleven other Therbligs - the last one is "thinking"!
History
In an article published in 1915, Frank Gilbreth writes about 16 elements: "The elements of the cycle of decisions and movements, whether that run partially or entirely along with other elements in the same or other cycle, consist of the following, arranged in various sequences: 1. Search, 2. Search, 3. Select, 4. Hold, 5. Position, 6. Raft, 7. Use, 8. Dissemble, or unload, 9. Check, 10. Transportation, loaded, 11 Pre-position for next operation, 12. Release load, 13. Transportation, empty, 14. Wait (unavoidable delay), 15. Wait (avoidable delay), 16. Rest (to overcome fatigue). " (Motion Study for the Crippled Army, in the Journal of the American Mechanical Engineering Society, December 1915, page 671.)
Note
References
- Gilbreth, Frank; Carey, Ernestine Gilbreth (1948). Cheaper with the Dozen .
- Aft, Lawrence (2000). Work Measurement and Repair Method . New York: John Wiley & amp; Sons, Inc. ISBNÃ, 0-471-37089-4.
- Singleton, W. (1982). The Body at Work . Cambridge: Cambridge University Press. ISBN: 0-521-24087-5.
- * Groover, Makell P. (2007). Work Systems, Methods, Measurements and Work Management . Upper Saddle River, NJ 07458: Pearson Prentice Hall, Pearson Education, Inc. ISBNÃ, 0-13-135569-4.
External links
- Gilbreth Network: Therbligs
Source of the article : Wikipedia
0 Comments