6-CH 26-27 (PTS-ST DATA)) - LECTURE:45-48 CHAPTER 26...

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1 LECTURE :45-48 CHAPTER : 26 PREDETERMINED TIME STANDARDS(PTS)
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2 DEFINITION Predetermined time standards (PTS ), also referred to as predetermined motion time systems (PMTS) or synthetic time standards , are advanced techniques which aim at defining the time needed for the performance of various operations by derivation from pre-set standards of time for various motions, and NOT by direct observation and measurement. THUS, PMTS/PTS MAY BE DEFINED AS FOLLOWS: “A predetermined time standard is a work measurement technique whereby times established for basic human motions (classified according to the nature of the motion and the conditions under which it is made) are used to build up the time for a job at a defined level of performance”.
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3 EXAMPLE FOR ILLUSTRATION As the definition indicates, PTS systems present techniques for synthesizing operation times from standard-time data for basic motions. The nature of PTS systems can be easily illustrated by reference to a simple work cycle , such as “PUTTING A WASHER ON A BOLT” The operator will REACH to the washer ; GRASP the washer MOVE the washer to the bolt ; POSITION the washer on the bolt & RELEASE the washer. Operations consist of, IN GENERAL, some or all of these five basic motions . To these are added other body motions and a few other elements .
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4 COMPONENTS OF A BASIC PTS. Table (below) illustrates Components of a basic PTS Motion Description REACH Move hand to destination GRASP Secure control of object With fingers MOVE Move object POSITION Line up and engage object RELEASE Let the object go BODYMOTIONS Leg trunk movements
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5 STANDARD TIME FROM PTS By examining the given operation and identifying the basic motions (of which it is composed), & by referring to the PTS tables ( PTS Tables indicate NORMAL/ BASIC TIMES for each type of motion performed under given circumstances), it is possible to derive a STANDARD TIME for the operation as a whole.
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6 ORIGINS OF PTS The pioneer of motion classification was Frank B. Gilbreth , whose "therbligs" subdivisions of hand or hand and eye motions were the key concept in the development of motion study. The credit for adding the time dimension to motion study is attributed to A. B. Segur, who in 1927 stated that "within practical limits the time required for all experts to perform true fundamental motions is a constant". Segur developed the first predetermined time standards , calling his system, MOTION TIME ANALYSIS (MTA).
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7 CONTD. The next important development was the work of J. H. Quick and his associates, who originated the WORK FACTOR system in 1934. A considerable number and variety of PTS systems were produced during and following the Second World War. Among these was a system which has become very popular throughout the world, METHODS‑TIME MEASUREMENT (MTM) and is widely used today.
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8 MTM SYSTEM MTM was first developed at the Westinghouse Electric Corporation in the United States by H. B.
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