OCTOBER 19-20, 2012 - YMCA University of Science & Technology

Proceedings of the National Conference on
Trends and Advances in Mechanical Engineering,
YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012
2. The statistical study shows waiting time (No Material) is 28.50% i.e. 2.28 hrs/shift which is quite large
and need to be cut down. The objective can be achieved by reducing the lot size from existing 500 Nos.
to proposed 270 Nos. Therefore, the suggested lot size should start from minimum 50 to maximum 270
nos. with a Buffer of 270 nos. as calculated above. This scheduling shall help in eliminating the waiting
time and improving the throughput time by 3.53 hrs/shift [(2.28 + 1.25) hrs] i.e. 44% increase in
production.
6. Validation and Conclusion
1. The average production per month of Category ‘A’ is 23464 Nos. (Table 3) and for Category ‘B’ is 14341
Nos. (Table 4), which amounts to average production of car shock absorbers per month as 37805 Nos.
(Category ‘A’ + Category ‘B’).
2. The settled target for production of car shock absorbers is 1600 Nos./shift i.e. 3200 Nos./day. Considering
actual working of 22 days per month the Total desired production per month is 70400 Nos.
3. The comparison of the present production with the targeted production shows result as 53.7% which means
46.3% is lost because of setup time and waiting time.
4. This confirms that the statistical estimation of lost time is very much inline with the actual data i.e. 47.28%
as statistical result and 46.3% as actual result.
5. The reduction in throughput time gives a base of 44% increase in production (Refer Sec. 4.0) i.e. present
average production quantity of 37805 Nos. gets increased to 54440 Nos.
6. The creation of buffer stock will increase the inventory levels but throughput will be smooth and delivery to
the customer is fast.
References
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