1. What Is RTY?

Rolled Throughput Yield (RTY) is a manufacturing metric that represents the probability that a single unit can pass through all process steps defect-free, without rework. It is calculated as the product of the first pass yields of each individual process step.

2. How Does The Calculator Work?

The calculator uses the RTY formula:

Where:

• \( RTY \) — Rolled Throughput Yield (%)
• \( First\ Pass\ Yield_i \) — Yield percentage at each process step
• \( \prod \) — Product symbol (multiplication of all yields)
• \( n \) — Number of process steps

Explanation: RTY accounts for cumulative defects across multiple process steps, providing a more realistic view of overall process quality than individual step yields.

3. Importance Of RTY Calculation

Details: RTY is crucial for identifying hidden factory costs, understanding true process capability, and prioritizing improvement efforts in multi-step manufacturing processes.

4. Using The Calculator

Tips: Enter first pass yield percentages for each process step. Values must be between 0-100%. The calculator multiplies all yields to provide the overall RTY percentage.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between RTY and First Pass Yield?
A: First Pass Yield measures individual step quality, while RTY measures the cumulative probability of a unit passing all steps without rework.

Q2: What is considered a good RTY value?
A: Generally, RTY > 95% is good, >85% is acceptable, and <70% indicates significant quality issues needing improvement.

Q3: Can RTY be higher than individual yields?
A: No, RTY is always equal to or lower than the lowest individual yield since it's a product of all yields.

Q4: How many process steps should I include?
A: Include all major process steps that could generate defects. Typically 3-10 steps, but depends on process complexity.

Q5: What if I have more than 3 process steps?
A: You would need to modify the calculator to accommodate additional input fields for each additional process step.