Electronics Forum | Thu Sep 13 11:21:45 EDT 2001 | aldo_maldonado
We've had several instances of parts (1206R, SOT-23) popping off of their location during reflow. Parts placement is OK, paste brick is aligned and compact before oven. But we get random parts off their location just lying somewhere else on the boar
Electronics Forum | Wed Jun 29 17:56:47 EDT 2005 | Ryan
We have a new Heller 1809 EXL reflow oven and when we run MELF�s or Aluminum Electrolytic Capacitors through the oven they are being blown off the pads. I have verified that the placement is good before reflow. I verified that they are pushed down
Electronics Forum | Thu May 18 08:31:28 EDT 2006 | marc
Hi James Short answer... yes... long answer...impingement velocity is excellent for heat transfer but it also is a higher risk of moving components. Variable speed blowers allow you to reduce the speed / impingment and more than likly your compone
Electronics Forum | Mon Jan 23 21:56:50 EST 2017 | jgo
Hi all, Am new to the SMT process. I'm in the process of purchasing a new SMT Pick & Place machine and am trying to figure out how to perform the buy-off. I'm from the semiconductor packaging background. For any new machine purchase, I'm used to se
Electronics Forum | Tue Jan 24 09:21:34 EST 2017 | emeto
there is an IPC standard for machine accuracy and repeatability. Here it is how it works. You have to place certain number of parts on a specially designed PCB(that allows placing variety of parts on big part of the machine work area). After that you
Electronics Forum | Thu Feb 24 23:01:30 EST 2005 | smtuser1234
One other thing to check is your PEC camera. Universal uses a jig to calibrate this camera but you could check it using this method. 1.Run about ten 0402 parts on tape with the PEC camera off and check placement. If the placement is off change the x\
Electronics Forum | Mon May 19 09:56:57 EDT 2008 | aj
all, The placement was off on one panel ( 4 up ) out of the batch. It was off by approx 1mm in the y-axis. No obvious faults found with machine. Any experience of such problem - I am guessing this is a sign of something wearing on the machine or s
Electronics Forum | Tue Jun 14 07:33:58 EDT 2005 | bobpan
If the placement is off the same amount everytime...(which I suspect it will be)...just adjust your placement co-ordinate for the part and be done with it.
Electronics Forum | Tue Jun 14 11:02:53 EDT 2005 | Stefan
I would rather take Bobpan's advise. If the placement is calculated from the center of two fiducials, than the placement should be off by 1/2 of the distance of the two fiducials, but not by the offset of that one fiducial. However, your approach in
Electronics Forum | Tue Feb 07 07:31:13 EST 2012 | bobpan
Are your placements being placed in the center of the camera crosshairs? If not, you need to fix your head to camera offset. The numbers are kept in a couple of mod codes. You also need to update the configuration file in central controller if the nu
