Electronics Forum: sagging (Page 1 of 8)

Screen printing warped boards

Electronics Forum | Thu Apr 20 14:24:54 EDT 2006 | pms

Sr.Tech, Don't know about AP25's, we have a DEK. We have problems with some large board sagging in the middle, causing the board to slip under the board stop, but our DEK has the ability to program the board stop anywhere in the Y direction, allowin

Looking for trays to lay boards on in reflow oven

Electronics Forum | Thu Jun 13 09:39:43 EDT 2019 | don_julio

Problem is I don't have a mesh belt (lesson learned). Our conveyor is pins. If I laid some scrap pcb's spanning the conveyor pins on the long dimension of the board, I'm confident it would sag. We get a bit of sag today in our 1.6mm thick boards whi

PCB wave dams

Electronics Forum | Fri Feb 27 15:48:13 EST 2004 | pdeuel

Dose anybody know of a method of preventing board sag in the wave process. We have a 2 year old Deltawave. The product we are running is a one sided 10in x 12in panel of 6 PCB's. Pin headers and connectors are near all of the edges. Our current board

SPI/AOI Board Support - Correcting for Sag/Warpage

Electronics Forum | Wed Jan 29 08:32:48 EST 2020 | dontfeedphils

I'm currently running Grid-Lok in my printer and have used it almost exclusively in the past. That being said, I'm looking for a solution to help correct/remove sag and warpage on PCBs that will run through our TRI SPI and AOI. I have no doubt th

Jig for PCB

Electronics Forum | Tue Apr 18 10:08:51 EDT 2006 | russ

We use materials such as G10, durapol, or FR4. We put a lot of holes in the fixtures so that only enough material is left to support the board during reflow to prevent sag/ warp or whatever. We also try and keep all bot side material in unpopulated


Electronics Forum | Thu Apr 20 17:26:15 EDT 2006 | russ

Well i wouldn't run every board then!!!! okay seriously, All bad parts off the same each time or are they "all over the place" Check your mount height, you may have sagging or warped boards or just bad part height

Solder bridging on IC leads

Electronics Forum | Mon Aug 23 17:43:18 EDT 2010 | davef

SAG: Questions on solder mask webbing with fine pitch parts are: * What is the minimum pitch that you can use webbing between fine pitch pads? * What solder mask do you use?

Re: Measuring Board Deflection

Electronics Forum | Fri Jul 14 11:34:37 EDT 2000 | Mike F

John, The first thing to check is how tight the boards are being held in the conveyor (assuming you are using a finger conveyor). They should be a little loose at the input end so there is some room to expand. If the boards are held too tightly, when

Re: Minimizing Board Warpage During Reflow

Electronics Forum | Thu Jun 11 23:35:40 EDT 1998 | Scott McKee

| Does anybody know if a contraption exists that will minimize a PCB's tendency to become slightly bent after reflow? We have a new product that we're planning to assemble in a couple of months. The board is 9.7" by 13.4" and it is imperitive that

Re: PCB snap-offs

Electronics Forum | Tue Aug 29 18:56:41 EDT 2000 | Campbell Livingston

One of the major problems with snap off's is heat from the wave weakens the joints. Try using more holes but smaller size. V-grooves may also be an option, but depth control is a problem as most are not NC machine controlled. Direction through the wa

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