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Board Talk
At Board Talk, the Assembly Brothers cut through the marketing hype, the platitudes and incompetent un-scientific baloney with a search for the truth.
This episode features:
Phil Zarrow, ITM ConsultingPhil has been involved with hybrid and PCB assembly for more than 30 years including equipment design for pcb fab and assembly. 
Jim Hall, ITM ConsultingJim has a wealth of knowledge in soldering and thermal technology, equipment and process basics and is a pioneer in the science of reflow technology. |
Accuracy of Pick & Place System Ratings
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Comments and Questions The IPC has attempted to shed light on this topic by introducing the IPC-9850 standard a few years ago. What many people don't realize is that the 50+ page standard is more than just a method for leveling the playing field when it comes to placement rates. The standard goes into defining the methods for determining other performance characteristics such as throughput (not to be confused with placement rate), reliability and accuracy. Most people know only of the placement rate portion of this standard as this is what most pick and place manufacturers publish in their specifications. Most only know of the placement rate associated with the 0603 placement pattern as this generally yields the highest placement rates. While this pattern varies the spacing and placement orientation of the components in an "attempt" to level the playing field, it is still not going to provide a means for comparing placement machines when it comes to typical SMT assemblies. There is only one way to know which machine will perform best on any given assembly and that is to have the pick and place manufacturer do a test with actual board in question and then guarantee the placement rate. That said, the fastest rated machine may not perform best overall because with today's lower volumes and more frequent changeovers, in many cases the tortoise beats the hare. G.P. |
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