Answer:
The average processing time per unit = 1.46 minutes per unit
MTT per unit 0.25 minutes per unit
Explanation:
Given that:
number of hours per day for a machine = 8 hours per day
The average throughput rate = 28 batches per day
the setup time = 5 minutes per batch
Plant operating hours = 16 hours per day
To calculate:
a. Average processing time per units is determined by evaluating the average processing time per batch.
Using the following formula:
Average processing time per units = Total available time ÷ batches per day
where;
Total available time = Operating time per day - batches setup time
Total available time = (16 × 60 )minutes - (28 batches × 5 minutes)
= 960 - 140 = 820 minutes per day
∴
Average processing time per batch = 820 minutes ÷ 28 batches = 29.29
NOW, Average processing time per units = Average processing time per batch ÷ batch size
= 29.29 ÷ 20 = 1.46 minutes per unit
b) MTT per unit
The MTT per unit can be computed by using the formula
MTT per unit = Setup time ÷ batch size
MTT per unit = 5 minutes ÷ 20 minutes
MTT per unit = 0.25 minutes per unit
