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

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Mis-align Component

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#38286

Mis-align Component | 8 December, 2005

Please give mesome guidelines for our pick and place machine (Juki)because we always encounter mis-alignment and missing components.

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Stefan

#38297

Mis-align Component | 8 December, 2005

If you mention mis-alignment and missing component in the same sentance, I suspect the component is not properly released after placement. Assuming the Juki machines use an air blow, after vacuum shut off, than I would look at a correct air flow first. Second, how is the z-height controlled? Is it possible that the Z-axis stops above the board and drops the component? Third, are components correctly placed, when placed on double sticky tape and last do they stay tack in the solder deposit after transport?

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#38304

Mis-align Component | 8 December, 2005

Board support.

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PWH

#38309

Mis-align Component | 8 December, 2005

Not sure how Juki centernests operate but baybe the board thickness is prgrammed wrong and the top board surface is too low or too high (bowed upward). This will cause bad placements. This is an easy mistake to make on HSP.

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