Electronics Forum: missed placed parts (Page 1 of 281)

chip placed upside down

Electronics Forum | Wed Jun 11 16:41:57 EDT 2014 | isd_jwendell

With Essemtec software you can specify to turn on vacuum once the nozzle is down at the part. The default method is to turn on the vacuum while the nozzle is up, but starting to move down. For light/tiny parts this can have the effect of making them

chip placed upside down

Electronics Forum | Wed Jun 11 10:01:24 EDT 2014 | isd_jwendell

I do not know the Juki machines, but on my Essemtec I need to turn on the vac after the nozzle is down for 0402 parts. I also cannot touch/hit the current part/tape because it tends to flip the next part from the tape bounce. Then there is also the t

chip placed upside down

Electronics Forum | Tue Jun 10 14:04:08 EDT 2014 | rway

Perhaps neither. I assume the part is T&R. It's flipping inside the tape before placement. I don't know how the nozzle could be doing it. There could be excess vibration on the feeder which is causing the part to flip. Just a thought.

chip placed upside down

Electronics Forum | Tue Jun 10 11:51:15 EDT 2014 | rway

Your target ppm in on the Juki machine a take it. So it's rejecting these parts due to the inversion? Any way to disable this. A right-side down resistor is not ideal, but it will certainly work electrically. Reese

chip placed upside down

Electronics Forum | Tue Jun 10 17:13:44 EDT 2014 | grauen06

I have seen this on a MyDATA machine and we had to slow our feed rate of the feeder down. That seemed to do the trick. We concluded the carrier tape was too large for the part, but our vendor didn't really seem to care.

chip placed upside down

Electronics Forum | Wed Jun 11 08:53:53 EDT 2014 | fredcalkins

That would be easy to check. Degaus the whole nozzle not just the tip. It should take more than a week to become magnetized again. If it becomes magnetic sooner maybe degauss the head? I would also make sure your vacuum does not come on till the noz

chip placed upside down

Electronics Forum | Wed Jun 11 16:52:17 EDT 2014 | aybars

yes, you should look to see on that particular feeders Z axis setting. When the tip goes down to the part it may be traveling down little too much. Just make sure you check which way is your - and + increments going and do not exceed more than 30 or

SMT Component placed upside down

Electronics Forum | Thu Jul 28 08:02:39 EDT 2005 | bobpan

When we see the upside down part problem its typically feeder related....either the feeder is making the part jump or the z is taught tooooooo deep causing the part to jump before its in its pick location. chow

BGA excursion placed by IP3

Electronics Forum | Tue Jul 02 08:59:14 EDT 2002 | jax

On an IP3, from what I remember, the BGA Part data is defined from center part moving out towards part edge. If your pick up point is a little off this problem can occur. Otherwise, Check your gain and offset settings. The machine is probably recogni

SMT Component placed upside down

Electronics Forum | Thu Jul 28 03:49:06 EDT 2005 | aj

Are you seeing many of the components in the reject bin of the machine? If it is feeder related I would expect to see some rejects unless the part is jumping and landing in the same orientation i.e. 3 leads on same side everytime! Other than that I

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