One unit of A is made of two units of B, three unit of C, and three units of D.

Question

One unit of A is made of two units of B, three unit of C, and three units of D. B is composed of two units of E and one unit of D. C is made of two units of B and three units of E. E is made of two units of F. Items B, C, and E have one week lead times; A and F have lead times of two weeks; D has lead time of 3 weeks. Assume that lot-for-lot (L4L) lot sizing is used for Items A, B and F; lots of size 50, 50 and 100 are used for Items C, D and E respectively. Items C, E and F have on-hand (beginning) inventories of 20, 50 and 150 respectively; all other items have zero beginning inventory. We are scheduled to receive 10 units of A in Week 2, 50 units of E in Week 1, and also 100 units of F in Week 1. There are no other scheduled receipts. Draw the corresponding time-phased diagram showing lead times to scale.

Explanation / Answer

activity Week lot size SoH Week1 Week2 Week3 Week4 Week5 Week6 Week7 A= 2B+3C + 3D 2 weeks 10 B= 2E + D 1 week 50= 2* 50 units of E +50 units of D 50= 2* 50 units of E +50 units of D C= 2B+3E 1 week 50 20 50 50=2*50 units of B + 3 * 50 units of E D    3 weeks 50 100 E= 2F 1 week 100 50 100= 2 *100 units of F 100= 2 *100 units of F F    2 weeks 150 100 150

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