4. (i) For a drill press operations, the following data are known: Observed time

Question

4. (i) For a drill press operations, the following data are known: Observed time Rating Work Elements (min.) 1. Load drill press 2. Drill hole with automatic power fecd 3. Check tolerance of the last piece produced during 0.25 0.15 0.08 110 100 115 machine cycle (#2) with go/no-go gauge 120 0.20 4. Unload drill press The company allows: 5% for personal, 5% for unavoidable delays and 5% for fatigue. Calculate the normal time and the standard time for the operation in min./pc. (ii) What are the uses of time standards? (iii) State the steps that are followed in a stopwatch time study

Explanation / Answer

(i)

Standard time = N x (1+AF) = 0.757 x (1+0.05+0.05+0.05) = 0.87055 min

Note: Allowance factor (AF) = 5%+5%+5% = 15%

(ii)

Time standards are necessary for the following four reasons -

1. To schedule work and allocate capacity - All scheduling approaches require some estimate of how much time it takes to do the work being scheduled.

2. To provide an objective basis for motivating the workforce and measuring workers' performance - the measured standards are especially crucial where output-based incentive plans are employed.

3. To bid for new contracts and to evaluate performance on existing one's - Questions such as "Can we do it?" and "How are we doing?" presume the existence of standards.

4. To provide benchmarks for improvement - In addition to internal evaluation, benchmarking teams usually compare work standards in their company with those of similar jobs in other organizations.

(iii)

Steps for a stopwatch time study -

Work
elements Observed
time (Ae) Rating (RF) Normal time
Ne = Ae x RF 1 0.25 110% 0.275 2 0.15 100% 0.150 3 0.08 115% 0.092 4 0.2 120% 0.240 Normal job cycle time (N) = Ne = 0.757 min

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