Question

Example:

A single-station assembly machine performs five work elements to assemble four

components to a base part. The elements are listed in the table below, together with the

fraction defect rate (q) and probability of a station jam (m) for each of the components

added (NA means Not Applicable).

Time to load the base part is 3 sec and time to unload the completed assembly is 4 sec,

giving a total load/unload time of Th = 7 sec. When a jam occurs, it takes an average of

1.5 min. to clear the jam and restart the machine. Determine:

(a) Production rate of all products

(b) Yield of good product

(c) Production rate of good products

(d) Uptime efficiency of the assembly machine

Quantitative Analysis of

Assembly Systems

Element Operation Time (sec) q m p

1 Add gear 4 0.02 1

2 Add spacer 3 0.01 0.6

3 Add gear 4 0.015 0.8

4 Add gear and mesh 7 0.02 1

5 Fasten 5 0 NA 0.012
​

Answer 1

Answer:

5=23+90-90+88\34_776