Electronics Forum | Fri Jul 06 18:22:51 EDT 2001 | davef
Oooo, you are waving 0402. Tell us more about your wave and its set-up. Never seen this [knock on wood]. When is this skewing occurring, after placement or during cure? What�s the distribution? What happens when you slow-down yer placement rate?
Electronics Forum | Sat Jul 07 04:30:23 EDT 2001 | johnw
Dave this seems to be happining at placement altough when u run cal board the palcement is fine could the glue density be causing this
Electronics Forum | Mon Jul 09 20:46:22 EDT 2001 | davef
Is the glue intended for printed SMD attach? 3 Are you following all the manufacturer�s glue shelf life recommendations? 4 Are you observing all the manufacturer�s glue working life guidelines? Finally, what level of skewing are we talking about?
Electronics Forum | Wed Aug 22 09:17:15 EDT 2001 | steven
if do not have x-ray inspection machine, how to verify the 1st board out from the smt placer that the BGA is placed accurately onto the solder pads. the diameter of the solder ball is 1mm. could it self align during reflow?
Electronics Forum | Fri Jul 06 09:39:18 EDT 2001 | johnw
Hi guys I am having problems with skewed placement of 0402 devices I would like to add the board has raised pads and we are placing on glue. We are now printing the glue rather that dispensing with a GL5. have any of you guys had this pro
Electronics Forum | Sat Jul 07 08:19:47 EDT 2001 | Stefan Witte
If your pads are raised as you mentioned, you will reach just the tip of your tiny glue dot, which may not hold the part in place. However, you should be using two glue dots on each side of your 0402 component. See under adherence force in paste a
Electronics Forum | Wed Jul 11 14:08:21 EDT 2001 | markhoch
Are you guys providing adequate board support during glue dispense and placement? I've had this same problem with 0603's that I was able to correct with adequate board support. Also, if you're using a Fuji glue machine, what are your temperature sett
Electronics Forum | Wed Aug 22 10:57:59 EDT 2001 | wbu
Hi Steven, BGA�s are known for their ability to self align and from own experiance they do. There�s enough documentation on this one available (...don�t have the links present like Dave but I�m sure he will give you enough to spend some evenings rea
Electronics Forum | Tue Mar 13 12:03:29 EST 2001 | LSMITH
Get another machine poopdick
Electronics Forum | Tue Mar 13 13:10:09 EST 2001 | onset
As long as you perform a repeat pickup on the part with an ordinary feeder you will be fine.
