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Time Study
Presented by:-
Chhavi Narayan
Khushboo singh
Abhishek sahoo
Dhondup
CONTENTS
• Introduction
• Objectives of Time study
• Advantages
• Time study by stop watch
• Diff between Time and Motion study
• Type of Elements
• Methods
• Sample calculation
• Computation of NT & ST
• Applications
• Conclusion
INTRODUCTION
WORK STUDY:-
 Motion study
 Time study:-
o A qualified, well trained operator
o Normal pace
o Doing a specific task
OBJECTIVES OF TIME STUDY
• To increase productivity
 To set labour standard for satisfactory performance.
 To determine basic times/normal times.
 To determine the number of machines an operator can
handle.
 To determine standards costs.
Advantages
To develop suitable working conditions
To improve utilization of resources
To reduce human effort by proper design of
processes
TIME STUDY MOTION STUDY
 Notes the time involved
in carrying out each
element of operation.
 Aims at fixing the
standard time for
carrying out a job.
 Is not suitable for
workers where quality is
prime consideration
 Study of motions on an
operation
 To reduce wastage of
time
 Suitable for all types of
jobs.
Diff between time & motion study
Types of elements involved in a job
 Repetitive element:- Occurs in every work cycle of the job.
 Occasional element:- Occurs at intervals.
 Constant element:- Basic or normal time remains constant.
 Variable element:- Basic or normal time varies.
 Manual element:- Performed manually.
 Governing element :- Occupies a longer time than any other
element.
Methods
 1.Predetermined time standard system
 2.Stop watch reading
a) Continuous
b) Snap-back
 3.Work sampling
Sample calculation
1. E=2√
𝒑(𝟏−𝒑)
𝒏
2. 𝒏 =
𝟒𝒑(𝟏−𝒑)
𝑬 𝟐
P=proportion of phoning of
activity
E=error
n=sample size
Que. A preliminary study indicates that the proportion of
idle time of a machine is 30% ; rest of the time it is
working . To get a good estimate of the idle time with a
precision of ±1% , then what should be the sample size?
n=
4(0.30)(1−0.30)
(0.01)2 =8400
Computation of NT & ST
Work
element
a b c d*
Obs. rating 0.56min 0.25min 0.50min 1.10min
Performanc
e rating
100% 80% 110% 100%
* Irregular element performed every 5
cycles
PFD allowance=15%
Normal
time=0.56(1.0)+0.25(0.80)+0.50(1.10)+1.10(1.0)/5=1.53min
Standard time=1.53(1+0.15)=1.76
Applications
 In decision making
 Provides accuracy
 Organisation and method
Conclusion
TIME STUDY

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TIME STUDY

  • 1. Time Study Presented by:- Chhavi Narayan Khushboo singh Abhishek sahoo Dhondup
  • 2. CONTENTS • Introduction • Objectives of Time study • Advantages • Time study by stop watch • Diff between Time and Motion study • Type of Elements • Methods • Sample calculation • Computation of NT & ST • Applications • Conclusion
  • 3. INTRODUCTION WORK STUDY:-  Motion study  Time study:- o A qualified, well trained operator o Normal pace o Doing a specific task
  • 4. OBJECTIVES OF TIME STUDY • To increase productivity  To set labour standard for satisfactory performance.  To determine basic times/normal times.  To determine the number of machines an operator can handle.  To determine standards costs.
  • 5. Advantages To develop suitable working conditions To improve utilization of resources To reduce human effort by proper design of processes
  • 6. TIME STUDY MOTION STUDY  Notes the time involved in carrying out each element of operation.  Aims at fixing the standard time for carrying out a job.  Is not suitable for workers where quality is prime consideration  Study of motions on an operation  To reduce wastage of time  Suitable for all types of jobs. Diff between time & motion study
  • 7.
  • 8. Types of elements involved in a job  Repetitive element:- Occurs in every work cycle of the job.  Occasional element:- Occurs at intervals.  Constant element:- Basic or normal time remains constant.  Variable element:- Basic or normal time varies.  Manual element:- Performed manually.  Governing element :- Occupies a longer time than any other element.
  • 9.
  • 10. Methods  1.Predetermined time standard system  2.Stop watch reading a) Continuous b) Snap-back  3.Work sampling
  • 11.
  • 12. Sample calculation 1. E=2√ 𝒑(𝟏−𝒑) 𝒏 2. 𝒏 = 𝟒𝒑(𝟏−𝒑) 𝑬 𝟐 P=proportion of phoning of activity E=error n=sample size Que. A preliminary study indicates that the proportion of idle time of a machine is 30% ; rest of the time it is working . To get a good estimate of the idle time with a precision of ±1% , then what should be the sample size? n= 4(0.30)(1−0.30) (0.01)2 =8400
  • 13. Computation of NT & ST Work element a b c d* Obs. rating 0.56min 0.25min 0.50min 1.10min Performanc e rating 100% 80% 110% 100% * Irregular element performed every 5 cycles PFD allowance=15% Normal time=0.56(1.0)+0.25(0.80)+0.50(1.10)+1.10(1.0)/5=1.53min Standard time=1.53(1+0.15)=1.76
  • 14. Applications  In decision making  Provides accuracy  Organisation and method