There are several pros and cons to each schedule. But the total number of processes also has a huge impact.
First Time Yield (FTY) First time yield, the most common way to calculate process yield, is the probability of a defect-free output from a process.This metric considers only the criteria at the end of the process. Figure 4. i.e. if you have one 144 pin QFP you have 144 potential defects plus pin one orientation and one opportunity for missing part.If you place seventy two 1206 resistors you have the same solder joint count but 72 possibilities for missing part.
World Class Manufacturing Practices for achieving Zero Defects. Quality – Achieved world-class first-pass yield on products Delivery – Made major improvements to operating efficiency Cost – Reduced production cycle-time across all facilities
A common way to calculate first pass yield is … Our Opportunity
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Your views would be welcome. It doesn't matter how many individual pieces inside are rotten, I'd still return the whole box to the shop. As you can see from the example above, it doesn’t take long for Most processes have hidden factories built in.
OEE Quality is similar to First Pass Yield, in that it defines Good Parts as parts that successfully pass through the manufacturing process the first time without needing any rework. A simplified definition of first pass yield is 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.
When used properly, DPMO is a more effective quality measurement tool than first-pass yield. One of the areas where Lean really shines is in simplification. Yield is one of the oldest metrics in the book. The on-the-fly reconfiguration and multi-head versatility of the ASM SX gives flexibility, speed and precision that reduces cycle time and cost and improves first pass yield. Yield. Other metrics (i.e. Using the first pass yield equation above, the FYP is:.95 x .95 x .95 x .95 = .81.
that define the meaning of terms.With regards to this term, though, there is no governing body for quality or Lean. The 4P’s of Marketing are: Product Price Promotion Place The origin of the 4 P’s isThe standard work schedule week is five 8-hour days, totaling 40 hours. So why would we want to do otherwise for electronics PCB assemblies?
How bad is 65% FTY. First pass yield may be called first time yield.
With no test a medium complexity board will be around 68.7% (according to Consulogic). The remaining time after Quality Loss is subtracted is called Fully Productive Time.
An item is considered a fail whether it has one or multiple defects.