we had the same problem with 0603 coil wound inductors a few years ago, and like you tried altering the pick parameters to no avail.  Our conclusion was that static charge was being generated on the cover tape which lifted the parts slightly as the tape was being peeled away.  The top heavy / unstable design of the parts resulted in the part then tipping itself on it's side.

Like you we changed to paper tape and the problems went away.

It's amazing how the component suppliers get away with introducing problems like this and then imply that you are the only customer who has ever had problems.

Regards,

Chris Murphy,
Production Enigneering,
Tait Electronics

Dorothy Lush wrote:

 It happens more frequently when the feeder is "bad". My guys on the floor would replace it and then it would stop or happen moe infrequently. I had a large problem with 0603 coil wound inductors being placed sideways, upside down or propelled into outer space sometimes with a 10-30% loss of part.  It turned out that no mater what you did (slow the placement, change the feeder, adjust the vision system), if the carrier was plastic you were doomed. Solution: change to paper carrier. I wonder if the same is true for resisters and plastic carriers. Static electricity, pocket wall not straight up and down enough?Dorothy Lush

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Howard Watson
Sent: Thursday, May 22, 2003 2:38 PM
To: [log in to unmask]
Subject: [TN] Sideways Resistors
 

Technetters,

I'm not sure if others see this situation, but it's a somewhat rare occurrence when we see some resistors, like 0805's, soldered on their sides.  Though it's not a defect per the conditions of IPC-A-610, I am still curious as to the root cause.  I don't know if they somehow get placed on their side or if they get pulled up that way during soldering.  Our P&P machine is a Mydata MY15, we use no-clean with reflow in air, HASL boards, 6 mil stencil w/ homeplate apertures.

Any thoughts?

Howard Watson
SMT Manufacturing Engineer
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