1. What is Cpk in Transport?

Cpk (Process Capability Index) is a statistical measure used in transport processes to determine how well a process meets specification limits. It indicates the capability of a process to produce output within specified tolerance limits.

2. How Does the Calculator Work?

The calculator uses the Cpk formula for transport:

Where:

• \( USL \) — Upper Specification Limit
• \( LSL \) — Lower Specification Limit
• \( \mu \) — Process Mean
• \( \sigma \) — Standard Deviation

Explanation: The formula calculates the minimum distance between the process mean and specification limits, normalized by three standard deviations.

3. Importance of Cpk Calculation

Details: Cpk is crucial for quality control in transport processes as it helps identify process capability, ensure compliance with specifications, and maintain consistent quality standards.

4. Using the Calculator

Tips: Enter USL, LSL, process mean, and standard deviation. All values must be valid (standard deviation > 0). The calculator will compute the Cpk value.

5. Frequently Asked Questions (FAQ)

Q1: What is a good Cpk value?
A: Generally, Cpk ≥ 1.33 indicates a capable process. Higher values indicate better process capability.

Q2: How is Cpk different from Cp?
A: Cp measures potential capability assuming the process is centered, while Cpk measures actual capability considering process centering.

Q3: Why use Cpk in transport processes?
A: Cpk helps ensure transport processes meet quality standards, reduce variability, and maintain consistency in delivery performance.

Q4: What are common Cpk applications in transport?
A: Used in delivery time accuracy, load capacity compliance, temperature control, and other quality-critical transport parameters.

Q5: How often should Cpk be calculated?
A: Regular monitoring (weekly/monthly) is recommended to maintain process control and identify trends or deviations early.