Question

Currently, the two-shift system works 480 min per shift on 5 working days per week. There is a 30-minute paid break per shift. Due to the good order situation, the throughput is to be increased to 250 pieces per working day. Various optimizations have therefore been implemented.

Two weeks after conversion to the U-cell production, throughput is well below expectations. As you take a closer look at the Carstens HG2 model grinding machine, you notice that, despite a lower throughput, it does not achieve the required throughput per week for the "Grinding 2: Bore grinding" operation.

2 variants of the torque wrench body are ground in the grinding process. 120 minutes per day are required for planned setup. The grinding wheel must be removed once per shift (duration 10 min). Per day the plant has on average 3 technical failures with 40 min duration each. The trained, long-term plant operator is ill for longer. Due to the staff shortage, the te rises to 450 sec/piece.

On average, the system produces 23 parts of scrap per shift, which are collected in a separate red container.

Calculate on a weekly basis the quantity of good-parts per working day (non-scrap; i.o.-parts) Round (if necessary) commercially.

(actual ouput 144 units)