first time yield
First pass yield (FPY), also known as throughput yield (TPY), is defined as the number of units coming out of a process divided by the number of units going into that process over a specified period of time.
The YIELD function returns the yield on a security that pays periodic interest. Our approach is to store and analyze the right data from your part production processes that will give you meaningful insight into the stages of production causing problems and the analysis tools to improve them. (# units leaving process A as good parts with no rework) / (# units put into the process) Whether it’s one troublesome station on your line, or a problematic assembly that spans across your line, applying process monitoring and data analysis tools can lead to substantial improvements in efficiency and huge savings on your bottom line.Contact us to talk to one of our application experts about improving yield. Catching and addressing defects at their source on the production line and continuous improvement of in-process tests has provided significant ROI and warranty reductions for one industrial manufacturer. To truly improve your manufacturing efficiency, first time yield offers a more in-depth view of production performance. But assume that each unit had 10 critical-to-quality characteristics. Improve First Time Yield on Your Production Line To enable cost savings and production efficiency, the emphasis must be on making products right the first time. Six sigma requires an entirely different mental model of yields.“That’s not all,” Peter said. “They correlate much more closely with labor, cycle time, rework costs and other important management metrics.”Sam frowned. Multiplying the set of processes would give you Rolling throughput yield (RTY).
The calculation of FPY, first pass yield, shows how good the overall set of processes is at producing good overall output without having to rework units.Throughput Yield (TPY) is the number of acceptable pieces at the end of the end of a process divided by the number of starting pieces excluding scrap and rework (meaning they are a part of the calculation).Rework IS a part of the TPY calculation. If we look at characteristics, we see that both have produced five defects in 100 defect opportunities.
To calculate first time yield (FTY) you would:(# units leaving the process as good parts) / (# parts put into the process) = FTYThe total first time yield is equal to FTYofA * FTYofB * FTYofC * FTYofD or .9000 * .8889 * .9375 * .9333 = .7000.You can also get the total process yield for the entire process by simply dividing the number of good units produced by the number going in to the start of the process.
This makes the first time yield (FTY) metric (which can also be referred to as first pass yield (FPY) or … That’s the customary way of doing it around here, but there’s a better way.”“Unit yields often have very little to do with costs,” Peter continued. The FTY for process B is 80/90 = .89.
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The calculation of RTY, rolling throughput yield, shows how good the overall set of processes is at producing good overall output without having to rework units. The normalized defects per unit equals 0.2481.Normalized Yield and other yield metrics can serve as baseline scores (Measure Phase) and final scores for Six Sigma projects (Control Phase).The baseline score does not have to be a z-score and often these yield metrics are easier for team and other company employees to relate with and understand.
The first time yield can be calculated by dividing the number of goods from a manufactured lot that meet pre-specified quality standards by the total number produced by the process. Only good units with no rework or scrap are counted as coming out of an individual process.
Process data can be collected during critical-to-quality processes on the line using our process monitoring devices, the The data collected by these devices is then stored by serial number in the centralized QualityWorX database, for easy accessibility and retrieval of process data for investigation in the event of a product quality issue.
We are honored to serve the largest community of process improvement professionals in the world. For example: You have a process of that is divided into four sub-processes – A, B, C and D. Assume that you have 100 units entering process A. Test cycle time had to speed up to meet production targets – but just as important, the First Time Through (FTT) rates at these stations were well below acceptable percentages. Process 3 at its initiation has all the costs in Process 2 + the costs of Process 1.There is another method to calculate TPY for a single process. The simplest way to demonstrate the importance of FTY is by exploring a quick example that illustrates how even small improvements in first time yield can produce very large savings in your product costs.
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