Calculation Of LCL and UCL
What is UCL and LCL?
For every style, workstudy officer make layout before line feeding. And every process have different work content. Some working time means SMV is below pitch time and some are upper than the pitch time. So in general all SMV are below BPT is known as LCL & all SMV are upper than BPT is known as UCL.
UCL stands for upper control limit and LCL stands for lower control limit. In a line graph that displays a continuous picture of what is happening in production process. The UCL and LCL on a control chart indicate whether any variation in the process is within the control level or caused for line imbalanced & less output as well.
Calculation of UCL & LCL:
UCL = BPT+10%
LCL = 2*BPT-UCL Or BPT-10%
For Example: BPT of a process is 0.50
SO, UCL = 0.50+10%
=0.55
LCL = 2*0.50-UCL
=1-0.55
=0.45
Another way is LCL = BPT-10%
=0.50-10%
=0.45
Why happening UCL & LCL:
Due to different workload process wise & SMV of process are also different, so sometimes need to allocate more operator considering fraction machine & operator requirement. Suppose a process need 1.6 operator but we can't use like that. So put 2 operator initially there. On the other hand a process required 0.40 operator to complete but use 1 operator there. That is the reason creating UCL & LCL.
Sometimes due to high efficient & low efficient operator also create UCL & LCL that we can find on capacity Graph. And it creates Bottleneck on next process.
Using of UCL & LCL:
While feeding new style, need to consider those things due to different work content otherwise line will imbalanced. After 3/4 days of feeding when make capacity graph then also check UCL & LCL to rebalance the line for smooth & maximum production. Know more details about line balancing?
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