Electronics Forum | Fri May 01 14:46:52 EDT 2015 | aprosser
Good afternoon, We are running some aluminum boards through a 7 zone reflow oven which have 2 4 pin right angled headers on the ends that are skewing. Does anyone have any suggestions to prevent this from happening?
Electronics Forum | Fri May 01 21:10:22 EDT 2015 | sarason
They are probably getting a little hot. So that leaves several courses of action. 1: Don't place them before reflow and hand finish. 2: Shield them with a little folded shield to decrease heat transfer. 3: Speed up the time through the oven, but th
Electronics Forum | Fri Jul 23 09:31:52 EDT 2004 | cyber_wolf
Make sure that your mesh conveyor drive chain is not jumping a sprocket tooth. This will cause the conveyor to "pop" and you will have skewed parts. I seriously doubt that it is your profile causing skew. It is more than likely something mechanical.
Electronics Forum | Wed Oct 20 11:15:23 EDT 2010 | jax
Circuit and Local Fiducials are all the same. The difference is the amount of "Stretch and Skew" that is accounted for. Local fiducials apply "Stretch and Skew" to a single placement or area of the circuit, depending on Equipment used. Circuit fiduci
Electronics Forum | Sat Jan 07 09:01:53 EST 2023 | venkataramanaiah
Hi, Have been observed the post reflow inductor skew which is weight of 3.50grams. Can we get any get the exact cause for skew and want to know how to check conveyor vibration.
Electronics Forum | Mon Jan 09 12:41:31 EST 2023 | proceng1
Magyart is on the right track. Lots of variables. Can you post a photo of the skewed part? But also, is it skewed in the paste before reflow? How many inductors are doing this per board? Lastly, indicate on the photo the direction of travel in the
Electronics Forum | Sat Feb 20 20:24:40 EST 2021 | sync40
Hello Ameen, It is needed a moderate impact bump to generate skew. Even blowing of the fans generally cannot generate serious skew -unless the pads apertures are not suitable for the components size/weight. You can try for yourself. Take a board wi
Electronics Forum | Wed Apr 25 16:35:55 EDT 2001 | Steve
Most of the time, we have very few skewed parts so I feel comfortable about the processes in general. However once in a while, often enough to throw off the first pass yield, we will get a few boards with a lot of skewed parts. By skewed I mean that
Electronics Forum | Tue Apr 24 12:56:39 EDT 2001 | Steve
We are experiencing a fair amount of skewed components, mostly 0805 resistors and capacitors, during the reflow process. We have pretty much ruled out the pick-n-place and have determined that it may be happening because of variables at the paste scr
Electronics Forum | Sun May 23 10:14:14 EDT 1999 | M Cox
| Has anyone had any experience or data using vibration during the reflow process. | We introduced a vibration device attached to the fixed rail on a Vitronics reflow oven. The reason was to prevent skewing on large PLCC devices. The process worked v
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