For Monitoring Process Capability We Use Which Graph
When to Use Pp Ppk Cp and Cpk. L S L Lower Specification Limit. 3 4 6 Assessing Process Capability σ estimated variability of the process standard deviation. . If we have a continuous data type then we can use 3 types of Control Charts ie. Pp and PPk are used for Process Performance. The standard method is from a control chart where the data is collected over a period of time. The R chart indicates whether the subgroup-to-subgroup variation is in control. Record the measurement data and plot this data on a run-chart and on a histogram as shown in the picture on the right. Capability indices predict process behavior. Cp is the process capability. Plot the Upper Spec Limit USL and Lower Spec Limit LSL on the histogram and calculate the Spec Width as shown below. Generally you use this when a process is under statistical control. It refers to how well the process can satisfy the specification...