Electronics Forum | Wed Jul 03 03:02:35 EDT 2013 | autoel
How to test the reflow solder joint shear strength? What are the specification to test solder joint shear strength? What are the different methods to test the solder joint shear strength? Vijayashree
Electronics Forum | Thu Jul 04 17:17:00 EDT 2013 | processman
Hello, Hoping for some recommendations for how its best to selective solder clinched PTH components.. We are using Ersa equipment. Problem we are having is some of the leads are holiding `blobs` of solder on their leads. Have tried single dot
Electronics Forum | Thu Jul 04 23:14:20 EDT 2013 | mbeauregard
Does anyone have a printable ruler for measuring smd/smt tape and reel components? I currently have one that measures 2 pitch and 4 pitch but it is small and only measures up to 75 parts at a time. I would like one to also include 8 pitch.
Electronics Forum | Sun Jul 14 21:09:59 EDT 2013 | isd_jwendell
"So why is the number of wraps = (Outside diameter - inside diameter) / twice the the thickness of the tape" 2*thickness because we are using diameter
Electronics Forum | Thu Jul 18 12:08:52 EDT 2013 | ericrr
Thats OK, no doubt your formula works, or you would not keep it. So does mine, without the 2t, (that is way I asked) I must go and find it, or rework it out since my old thread has gone from this web site.
Electronics Forum | Wed Jul 24 13:41:17 EDT 2013 | ericrr
To give a better idea of how to calculate the amount of parts on a reel, one might like to survey the attached diagram it is very simple, the extra parts per layer follow a linear fashion.
Electronics Forum | Wed Jul 10 14:25:04 EDT 2013 | pankajp
thanks ben. any ball park number for weight of solder paste per pad? ( i understand this will be dependent on AREA of pad, but a rough estimate is good enough for me). -Pankaj
Electronics Forum | Wed Jul 10 15:35:08 EDT 2013 | rgduval
In general, I've always considered solder paste a part of the overhead costs, along with wire solder, and other consumables utilized on the shop floor. It's a part of the cost of the assembly, but, I don't calculate it directly as a part of quotin
Electronics Forum | Wed Jul 10 14:29:27 EDT 2013 | isd_jwendell
You wouldn't have a very good profile if you went straight from room temp to vapor temp (_-). The chamber should preheat the board before using vapor to melt the solder.
Electronics Forum | Mon Jul 15 08:11:04 EDT 2013 | emeto
I am pretty sure that is a moisture issue. You should probably bake your boards and some of your parts.
