i. Therbligs.
ii. MTM (Method Time Measurement)
Therbligs :
1. Therbligs are used to describe the basic element of movement or fundamental hand motions of the work cycle.
2. Every therbligs is presented by a symbol, a definite colour and name. (Letter or word)
3. Therbligs refers primarily to motions of human body at workplace and to mental activities associated with them.
4. For example:
MTM -Method Time Measurement: (Appropriate Explanation – 2 Marks)
1. It is a procedure which analyses any manual operation or method into the basic motions required to perform it and assigns to each motion a predetermined time value by the nature of motion and the conditions under which it is made.
2. M.T.M. was developed from motion picture studies on industrial operations and time standards, the time unit is known as T.M.U. one TMU = 0.0015 minute.
3. Basically M.T.M. is a tool of method analysis that provides the answers in terms of time without the use of stop watch.
4. There are different motions such as Reach, Move, Turn, Grasp, etc. Each motion is given a number such as case A for reach, which is to reach for object in a fixed location. A table of distance is given with values, which vary according to whether the hand is in motion or not and so on. Such tables are prepared on the basis of research.
5. For a particular job when all motions have been identified, classified and recorded, the time value for each is determined from the MTM data. The sum of these motion times is the time an operator of average skill would take to perform the task.