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Pick Up Error

Dhanish

#29782

Pick Up Error | 1 August, 2004

Can Pick Up Misalignment or Bent Nozzle at Pick and Place Machine can cause missing or misalignment component?

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V.R.Kini

#29806

Pick Up Error | 3 August, 2004

Bent nozzle can result in vaccum leakage resulting in parts falling during part pick up. Correct this. However, if your machine has laser/vision alignment, you should not be having a problem since these come in to picture after pick up. If you have a mechanical pick & place system, bent nozzle might cause wrong placement, hence, you have to reprogram the co-ordinates.

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Dhanish

#29869

Pick Up Error | 5 August, 2004

So are you saying there is no way the vision system will accept the part if there is problem with feeder or nozzle?In what case,misalignment can happen before reflow process?

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#29882

Pick Up Error | 5 August, 2004

Unless the machine rotates component after vision.

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Darren

#29900

Pick Up Error | 5 August, 2004

Dhanish, There are a number of things to know before we can answer a large question such as yours. 1) what machine is being used. 2) how does the machine account for height at placement. 3) is the part rotated a large amount after placement. 4) is the vacuum strong enough for the part. 5) is the part picked squarely on the nozzle. 6) is the board secure in the worknest or table. 7) is the board warped. 8) is the problem random. 9) are the parts just misaligned or are some missing. 10) if this is a fuji are you using the correct vision file or number or one that seems to work. 11) what type of part is affected If you can answer some of these questions you will probably see your answer.

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Dhanish

#29902

Pick Up Error | 5 August, 2004

The machine type is Fuji CP6.We have major issues with Network Resistor placement.The equipment guys often feedback there is a problem with nozzle and feeders.What will happened to the part if the Thickness data in the Part Data does not match the Part actual thickness?

1) what machine is being used.Fuji CP6 2) how does the machine account for height at placement.Not sure 3) is the part rotated a large amount after placement. 4) is the vacuum strong enough for the part.OK. 5) is the part picked squarely on the nozzle.Dont the vision system throw the part if it is not picked up in the center. 6) is the board secure in the worknest or table.Yes 7) is the board warped.No 8) is the problem random.Mainly at Network Resistor 9) are the parts just misaligned or are some missing. 10) if this is a fuji are you using the correct vision file or number or one that seems to work.Based on the Manual 11) what type of part is affected If you can answer some of these questions you will probably see your answer.

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Haran

#29903

Pick Up Error | 5 August, 2004

Pls advise how the part thickness affects the placement for Chip Shooter like CP6.

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#29913

Pick Up Error | 6 August, 2004

If your part height(thickness) is set too tall in the software, the machine will drop the component before it touches the paste. If your part height(thickness) is set too short in the software you will smash the part into the paste. This can cause damaged nozzles, and mis-alignment as well.

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#29915

Pick Up Error | 6 August, 2004

Try slowing the cam speed to 50% or so to start with. Also make sure that you are using the largest nozzle you can on that particular part.

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#29917

Pick Up Error | 6 August, 2004

Do you mean to say that the turrets can compensate for the height? I thought it was purely a mechanical up-down movement with the cam and hence the thickness hardly has any effect!

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Andrew

#29919

Pick Up Error | 6 August, 2004

I have also heard both explaination from different Equipment Engineers.I am not sure which oine is right for chip shooter.

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Bob R.

#29920

Pick Up Error | 6 August, 2004

It depends entirely on the machine. Different machines use different mechanisms and control methods.

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JB

#29923

Pick Up Error | 6 August, 2004

"I thought it was purely a mechanical up-down movement with the cam and hence the thickness hardly has any effect!"

It is purely mechanical.On our high speed turret the machine knows the distance between the tip of the nozzle and the top surface of the board. The thickness of the component is a factor,and is crucial.It will indicate how much to substract to the travel of the nozzle to get to the surface of the PCB.

On the other hand, we have a pick and place machine that has a different placement indicator. The placement is controlled by an impact switch, the nozzle will travel down, and as soon as it touches the board it will indicate that it has placed the component and it will then retract. With this machine, you can specify the grams of pressure that you want to use.

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Marcel

#29931

Pick Up Error | 6 August, 2004

Dhanish, on a CP6 if you have skew problems or missing parts begin by a center check on your smalls nozzles. If all nozzles goods, you will have to check the Z zero of the table, this is the pulse count of the z axis (table height) when the turret is at 200 degree with the place solenoid engage, you want the board just touching the tip of the nozzle. If you still have problems, check your pickup you might have to recalibrate some of your feeders especially those for small parts (0402). You can check also the air kiss adjustment on the place station, if it's to strong it will blow the parts on board. And of course you have to input the good part height on your PDG. So has you can see this not a simple problem.

Marcel Controle MD

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#29980

Pick Up Error | 10 August, 2004

This could also be caused by a bad PD. What vision are you using for the Resistor Networks? I am assuming the you are talking about small flat packs about 3.3mm x 1.6mm? I use vision type 12 and just use the body size. (wide view). And 100% cam speed. 1mm nozzle usually. John

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#30010

Pick Up Error | 12 August, 2004

Hi guys I havnt been on for a while so its nice to be back been working in europe mostly

Fuji CP6 skewing rnets Marcels comment is the closest rnets are a problem as said before the main areas are

1 A good assmbley shape is a must with 30% default 2 Table speed 3 Cam speed 4 Air kiss to much and you cause solder splatter 5 spool valve setting 6 Camera delta calibration 7 vision algo can cause skewing 8 is the table level

I could go on for ever

Mail me and I will help you

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