Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Mark D. Milward

#10467

HSP 4796 Chip Shooter | 23 July, 1999

Has anyone had the experience of losing components after they have been placed by the HSP 4796 because of table movement. I've worked on the 4760s, 4780s, and 4785. I don't know if this is a problem or not. We are trying to determine if this a possible cause for missing components on some boards. I am aware that the HSP 4796 is a faster machine than the others.

Thanks,

Mark D. Milward

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HERMAN

#10468

Re: HSP 4796 Chip Shooter | 26 July, 1999

| Has anyone had the experience of losing components after they have been placed by the HSP 4796 because of table movement. I've worked on the 4760s, 4780s, and 4785. I don't know if this is a problem or not. We are trying to determine if this a possible cause for missing components on some boards. I am aware that the HSP 4796 is a faster machine than the others. | | Thanks, | | Mark D. Milward Hi Mark, I�ve been working with this machine and I don�t think that you are missing components for that reason, maybe you should check other parameters before slowing the machine speed, like placement, maybe the chips need little more pressure over the paste or check your support pins, they are maybe jumping after the nozzle leaves them, may be many reasons, but I�really don�t think is for speed. I hope this can help you.

Herman

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TMV

#10469

Re: HSP 4796 Chip Shooter | 23 February, 2000

I would definitely check the amount of adhesive/paste that you are putting on the board. It may not be enough for any moving table application. If you think you are OK there, lets go on. As you probably are aware, the HSP tact times can be independantly controlled for each and every p/n. If you have a tall, heavy, or awkward component that is being placed on the board, try decreasing the XY table speed for that p/n, and place it ant the end ot the pattern. If you place it in the middle of the pattern, all placements after that will also run at the loxered table speed. The acceleration curves that are built into the XY table alleviate the need to do this in most cases.

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