Electronics Forum | Wed Jun 30 20:32:44 EDT 2021 | rgduval
Check the friction numbers...there could be an issue with the z-wagon bearings, or something else adding tension to the z-travel. Also make sure there are no cables interfering with the z-travel. Could be a cable that moves into the way at some spe
Electronics Forum | Tue Apr 26 15:57:59 EDT 2022 | proceng1
I didn't look into the two pad layouts and what they look like, but here is what I tell my operators. When the solder goes to liquidous, the surface tension will pull on the part from each pad, essentially centering the part. Assuming that the pads
Electronics Forum | Wed Oct 11 13:40:20 EDT 2023 | proceng1
Agreed. Your "leads" are fairly small compared to the PAD area, so you leave your part lots of room to "stretch it's legs". One thing that I have trouble communicating to my operators is that placement does not have to be perfect, and neither does t
Electronics Forum | Thu Jun 22 11:01:54 EDT 2000 | Chrys Shea
Jason, Double sided reflow should be no problem. People have been doing it for years. The surface tension of the molten solder will hold the components on the bottom side during your second pass. This is almost always the case, unless you have re
Electronics Forum | Thu Jun 22 11:02:13 EDT 2000 | Chrys Shea
Jason, Double sided reflow should be no problem. People have been doing it for years. The surface tension of the molten solder will hold the components on the bottom side during your second pass. This is almost always the case, unless you have re
Electronics Forum | Sun Jun 10 12:15:37 EDT 2001 | procon
Hello Danial, Leave it up to most to blame the relow oven for their tombstoning problems when in fact it is usually the last to cause it. The biggest culprit of tombstoning is the pad design followed by the print quality. Usually, we find that the p
Electronics Forum | Sat Feb 05 21:58:08 EST 2000 | Stu Leech
I agree with all of the previous comments. 1) Here are a few things to keep in mind when cleaning with water. To effectively clean, any liquid must wet the surface. By itself, water has a surface tension of 70 dynes/square cm. This is relaively hig
Electronics Forum | Fri Aug 27 13:34:25 EDT 1999 | Brian Larson
If your through holes are overlarge or the anular rings too small, the surface tension of the wave may exceed that of the joint. I would look at the design. You may want to put a strip of kapton tape on the following edge of the panel to test the "
Electronics Forum | Fri Aug 27 14:38:54 EDT 1999 | Doug
Brian, Thanks for the input. The hole size is good but the anular ring is small. I have helped the condition by reducing the clinch on the LED's. This I believe is reducing the pull out path. Thanks again | If your through holes are overlarge or th
Electronics Forum | Thu Jun 17 09:50:27 EDT 1999 | Brian Wycoff
| | WOULD LIKE TO DO RELOW OF 2 SIDED SMT BOARDS. USUALLY THE BOTTOM SIDE HAS RESISTORS AND CAPS ONLY. WHEN THE BOTTOM OF THE BOARD HEATS UP, THE PARTS ARE FREE TO MOVE AND ONLY SURFACE TENSION WILL KEEP THE COMPONENT FROM FALLING OFF. | | CAN BOARDS
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