Hi all, At our Fuji CP-6 machines we place a lot of 0402:s, 0603:s and 0805:s chip capacitors. Our problem is that the height of the components can sometime be very extreme from different vendors. I am sure you all have experience of this phenomenon. For ex. a 0603 cap with dimension of 1.6 x 0.9 x 0.9 mm with a certain partnumber can vary as much as 0.6 mm in height. T= 0.7-1.3 mm There are also circumstances that the caps will vary in x-y size. Our company must have at least 3 or more vendors for the majority of the components. So It is out of the question to stick with only one vendor. There are absolutely No problem with the resistors. We have been talking to the vendors, but...
The problem: let say we have a certain comp. with a height of 1.3 mm and this is also the numbers set in the pattern program/comp. databse for that specific part nr. Suddenly there are another wendor of that comp. that has the height of 0.7 mm. Now, during the placement cycle the nozzle will stop some tenth's of a mm above the pcb and cause the comp. to drop on the board. You can imagine the rest...
This is my question to You since our local Fuji guys fail to come up with an adequate answer: is it possible to set the comp. height in the comp. database for the minimum height of the comp. that we use and then when the comp. reel neeeds to be replaced with a comp. from another vendor with a much higher height of the comp; will the nozzle still handle that, since it is springloaded? How many tenth of a mm can the nozzles handle in Z-axis before they will be stuck in the head?
On the other hand, if we have a comp. height set to the lower end; let say 0.6 mm height and after a reel/comp. exchange from another vendor with a comp. height of 1.3mm Will this cause a potential stress/crack at the comp. so it will fail "out in the field"? Of course I am talking about the extremes, but we are facing this.
Please be so kind to tell me if I have been unclear of this matter. I am Sorry for my poor english & grammar. /Sincerly
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