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# 4. Time Study - PowerPoint PPT Presentation

4. Time Study. The major objective of this chapter is to learn how to calculate a time standard based on stopwatch time study procedures. Time Study. A process for measuring the required time for performing a given task, by a given method, by a trained worker, working in a normal pace.

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### 4. Time Study

The major objective of this chapter is to learn how to calculate a time standard based on stopwatch time study procedures.

• A process for measuring the required time for performing a given task, by a given method, by a trained worker, working in a normal pace.

• Why needed?

• For methods improvement

• For determining time standards

• Developing schedules

• Determining wage payment plans

• Estimating production costs

• Providing a base for estimating productivity goals

• Appraising employee performance

• Evaluating alternative process, equipment

• Direct time study

• Cyclic work

• Non cyclic work

• Work sampling

• Synthetic data

• Predetermined times

• Methods improvement

• Selection of the examined workers

• Explanation (union, managers, workers)

• Collecting and recording information

• Who to choose?

• Select an Average Worker (What is average?)

• Experienced operator

• Normal pace

• Consistency (well defined, understood by all)

• No undue strain for entire day (speed/effort)

• Pace that should be performed, not average of current rate

• Rating accuracy

• Worker acceptance

• Can you suggest a better method?

• Identify the TASK/ CYCLE to be studied before time study

• Method

• Layout of workplace

• Equipment used

• Environmental conditions

• Machine speeds and feeds

• Inspection equipment

• Communications with foreman, workers

• Documents for process, task instructions

• Establish relationship

• Elemental analysis

• What is an ELEMENT?

• Element is a component of job or task that are logical divisions with easily identifiable starting and end points, and are repeated on a regular basis

• What is a CYCLE?

• Cycle is the completion of the activities (elements) required to perform the job under study.

• Every element must have an easily identifiable starting and ending point (breakpoints)

• No discontinuities between elements

• Elements times: 0.04min (short), 0.25min (reasonable)

• Relative frequency must be included

• Continuous

• Advantage: Clock never stops, no time omitted

• Disadvantage: observer does not know at the job how individual elements vary

• Snapback

• Advantage: Observer can note individual variability within an element and eliminate substraction

• Disadvantages: difficult to coordinate eye, watch and task! Especially when operations are short

Time measurement

• Measuring time of each element

• The number of observation of each element depends on the significance level and required level of accuracy

• Don’t comment to the worker during the task

• Stand (don’t sit) beside the worker

• Write every event (even though it may seems not important)

• Have a good position to observe

• Stop the study if the worker seems to be under pressure and it affects his/her work

• Rating evaluation may be written once in a couple of cycles

• Elements times: 0.04min (short), 0.25min (reasonable)

• Denoting non-cyclic elements

• The breakpoint between elements should be clear (touch, push, etc.).

• Manual/machine (determines the task duration)

• Cyclic/non cyclic

• Fixed time/ variable time (i.e. loading time as a function of weight)

• Avoidable/unavoidable unproductive elements (sometimes hard to identify)

• Use continuous timing

• Divide the task into relatively large elements

• Write the evaluated performance rate at the end of each element

• Multiply the observed time with the rate and summarize the data

• Subjective judgment

• Practice by watching movies

• For a study with long elements, rate each separately

• Methods:

• Speed rating

• Westinghouse

Criteria for Successful Speed Rating Evaluation

• Experience in the class of work performed

• Selection of an operator who gives performances between 85 and 115

• Use of the average value of three or more independent studies

Personal Need

Basic Fatigue

Variable Fatigue

Unavoidable Delays

Avoidable Delays

Extra Allowances

Constant Allowances

Special Allowances

Total Allowances Allowances

+

Normal Time

=

Standard Time

Elemental times, based on previous time studies, which have been proven to be accurate and reliable.

Tabulated element standards that allow the measurement of a specific job without the use of timing devices.

Given we have the plans for a new building, how much labor is needed and what will it be used for?

Punch Press Standard Data(40” strip)

Given we have a new part to run through the punch press, what will be the standard time for the part?

• More consistent standards results

• Duplicate time studies on similar operations are eliminated

• Standards are established more rapidly

• Less experienced analysts can calculate standards (use the formula not develop it)

• Accurate labor costs and production times can be estimated before production begins

Element119130220310311322329

10 0.24 0.22 0.23 0.23 0.24 0.22 0.23

20 0.38 0.35 0.35 0.37 0.36 0.36 0.37

30 12.06 10.44 8.71 6.58 10.83 6.34 7.25

40 3.66 4.81 0.00 2.79 5.84 4.55 4.10

50 0.00 1.63 1.91 1.69 1.80 1.45 0.00

60 0.12 0.12 0.13 0.11 0.14 0.14 0.13

To Illustrate the development of standard data…

ModelNT 3/4/5D1D2

119 15.72 18.00 27.25

130 16.88 23.50 33.50

220 10.62 2.50 1.50

310 11.06 3.00 7.25

311 18.47 25.00 44.00

322 12.34 12.00 18.25

329 11.35 3.00 8.00

Is there a relationship between D1 and the combined time for elements 30, 40, and 50?

n X1 X2 X1^2 X2^2 X1*X2

1 15.72 18.00 247.1184 324.00 282.96

2 16.88 23.50 284.9344 552.25 396.68

3 10.62 2.50 112.7844 6.25 26.55

4 11.06 3.00 122.3236 9.00 33.18

5 18.47 25.00 341.1409 625.00 461.75

6 12.34 12.00 152.2756 144.00 148.08

7 11.35 3.00 128.8225 9.00 34.05

Sums 96.44 87.00 1389.3998 1669.50 1383.25

r = 0.977

Y elements 30, 40, and 50?

X

Linear Regression

Y = b0 + b1X

Standard Times for Machining Operations elements 30, 40, and 50?

• How long will it take to drill a 1-inch hole through two inches of malleable cast iron?