time & motion study
TRANSCRIPT
• Time Study• Methods, Steps of time study• Allowances• Motion Study• Procedure of Motion Study• Flow Process Chart• Therbligs• Micro-motion Study
Including….
Time study is a direct and continuous observation of a task, using a timekeeping device (e.g., decimal minute stopwatch, videotape camera etc.) to record the time taken to accomplish a task and it is often used when :1.there are repetitive work cycles of short to long duration2.wide variety of dissimilar work is performed, or 3.process control elements constitute a part of the cycle.
Time study
Techniques of Time Study
Direct Time Study: is a determination of quantum of total time required to perform a unit of work. It helps to compare the alternative methods, and determine the labor and staff required for the operations.
Synthesis Method: Adding a few elemental values over the data already obtained in the form of a catalog reading. This gives allowable time for operation to complete.
Analytical Estimating: is used to determine the time values for jobs having long and repetitive nature or values. Such work can be recorded using the synthetic and standard data available.
PMTS: Also called as predetermined motion time study. Computes the natural or basic time set up against motions at a defined level of performances.
Procedure for Time Study
Secure and record information about the operation and operator being studied. Select operators Divide the operation into elements and record a complete description of the method. (before you start study) Assign particular work to operators Observe operators performing task: record time taken for each element. Rate the operator’s performance. Determine appropriate work standards.
Advantages of Time Study
Generally they are required:A.to plan future production andB.to evaluate performance of workers or of the production system as a whole.
Limitations of Time StudyThe followings are the limitations of time study as a technique of
setting production standards:1)Standards cannot be established by this technique on jobs which are not well defined.2)In situations where it is difficult to define quality precisely standards and production incentives may cause deterioration in quality levels.3)Labour unions may oppose the application of time study where they are strong.4)Only specific type of jobs which have identifiable starting and ending points can be timed accurately.
Allowances Relaxation Allowance
– For fatigue and personal needs Contingency Allowance – For duties of periodic nature Tools and Machinery Allowance – For adjusting
machines, sharpening tools, etc.
Reject Allowance – Time used up in producing items which turn out to be
defective Interference Allowance – Stoppage of 2 or machines Excessive Work Allowance – Due to unforeseen temporary changes
Time Recording Techniques in Time Study
Stop Watch MethodTime Recording MachineMotion Picture Camera
Stop Watch MethodTime study equipment includes the following;a)Time study watch
Plain Decimal-Minute Stopwatch Decimal Hour Stopwatch Split-Hand Stopwatch Wink Stopwatch
b)Time study boardc)Time study observation sheetd)Steel rule
Time Study Board
Electronic Time Study Board3-Watch BoardSimple Time
Study Board
Time Study Sheet
Time Recording Machine
Functions on a paper tape Easy time recording Its use eliminates errors of
stopwatch method
Motion Picture Cameraa) Spring Driven Camera(normal
speed 16eps)b) Electric Motor Driven Camera
i. Slow Speed Camera(operates at 50/100fpm)
ii. Normal Speed Camera(operates at 960fpm)
Motion Studyo It is the science of eliminating wastefulnessresulting from using – unnecessary – ill-directed & – inefficient motion.o The aim of the study is to find and perpetuate
the scheme of least waste methods of labour.Motion studies were conducted by Frank and
Lillian Gilbreth about a century ago in a search for the “one best way.”
Procedure of Method StudyJob to be studiedCollection and recording of necessary
informationCritical examination of existing methodDevelop the new improved methodInstall the improved methodMaintain the improved method
Flow Process Chart The flow process chart in industrial
engineering is a graphical and symbolic representation of the processing activities performed on the work piece.
Flow process chart are of three types;
Man Machine & Material
TherbligTherbligs are 18 kinds of elemental motions used in the study of motion economy in the workplace. A workplace task is analyzed by recording each of the therblig units for a process, with the results used for optimization of manual labor by eliminating unneeded movements.
The word therblig was the creation of Frank Bunker Gilbreth and Lillian Moller Gilbreth, American industrial psychologists who invented the field of time and motion study. It is a reversal of the name Gilbreth, with 'th' transposed.
Micro-motion & Macro-motion Study
Studies of overall factory flow or process, called macromotion studies, and then additional studies of detail or operations, called micromotion studies, should be completed for a project.
Importance of T&M Study T&M Studies can be effective for
performance evaluations T&M Studies can be used for planning
purposes in order to predict the level of output that may be achieved
T&M Studies can be used to uncover problems and create solutions
T&M Studies can be used for time cost analysis