Over the years the component densities as well as the circuit sizes have changed quite a lot. As a result the design of some PCB's meant there was not space for a bad mark on each circuit. How to solve these problems on the pick and place machine?
For many years the bad marks have always been located on the circuit itself. This was easy to handle, not only for marking the bad circuits, but also for the equipment. There was also a disadvantage: depending on the number of circuits, moving the camera to all bad mark positions for checking became quite time consuming task.
Standard Bad Mark Position
JUKI's FX-3 High-speed Chip Shooter helps you with a new feature for programmable bad marks. The programmable bad marks allow placing the bad marks anywhere on the PCB. This makes the bad mark process very flexible as well as fast. This is a big step forward for both flexibility and a continuous process.
Extended Bad Mark Position
Following is a step by step process of how to link bad marks to the appropriate circuits.
First of all in "PWB data -> Basic settings" change the bad mark coordinates from Standard to Extended. Then click the Ex. Bad Mark tab on the left hand side.
In this window you need to enter the bad mark coordinates for every circuit. In our example the bad marks are located in a row on the bottom of the panel.
Number one and the related coordinates in the list are associated to the circuit number one in the panel. As soon as production starts and the selected bad marks will be seen the related circuits will be skipped. As you can see in the example above, bad marks are on the panel for circuit #1, #10, #11 and #17. Therefore, the FX-3 will not place any components on these circuits.
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