Electronics Forum | Sat Apr 25 19:40:01 EDT 1998 | Stan Traxler
| We have to mount our SMD devices 0.1 to 0.4 mm off the pcb | PCb substrate to compensate for thermal stressing in a | Space enviroment. Has any one any ideas or contacts for | dissolvable pads. this only applies to leadless components We have appl
Electronics Forum | Tue Nov 11 07:52:26 EST 2008 | jdengler
Is the part height set correctly. Too high and it gets ped. Too low and it's jammed into the board. Both can cause poor placement. Jerry
Electronics Forum | Wed Apr 28 10:29:04 EDT 2004 | dougt
By "placement pressure" I assume you mean force. I don't know of placement machines that have transducers mounted on the placement spindles that actually measure force. We made a board with a force sensor mounted through a hole so that it was the sa
Electronics Forum | Thu Apr 29 10:35:31 EDT 2004 | dougt
Start with a load cell (force sensor), you will need one that can handle the force range you will be placing. Someone please correct me on this if I'm wrong but I seem to recall that placement force runs in the range of a couple hundred grams. Chec
Electronics Forum | Thu Jan 27 10:22:21 EST 2000 | JAX
Dennis, Not sure why your so secrative about what machine but I guess it doesn't matter. When you start placing 0402 & 0603 packages the difference between height and width and length gets lost in tolerance. This allows the machine to pass parts t
Electronics Forum | Thu Nov 17 05:11:09 EST 2011 | bobpan
wow.....lets try some more things....... first....i think quad align error 0 has something to do with the theta number not being at 0,6000,12000,18000. I am not for sure about that but check it out by doing a function 3 on your pickups. second.....
Electronics Forum | Tue Jan 02 02:30:18 EST 2007 | _____
Ahh yes, 254. Don't give up on the other vision types. 254 can give you skewing as well. Your width and height are awfull close. Even with the 0.5 tolerance it is using the tolerance and saying that it is OKAY. Maybe what you measure is 1.8mm for wit
Electronics Forum | Wed Jun 24 18:44:14 EDT 2009 | mark_h
Hi Everyone My company has done loads of 0402 placements but are now required to start looking at 0201 and micro BGA placements. I’ve done loads of research and I’m happy with stencil design, area ratio, oven profile, machine requirements and paste r
Electronics Forum | Fri Sep 02 16:22:37 EDT 2011 | ttaubert
Are there SMT mechanical components like that could be used for orientating PCB-level optics on the board and do not require holes in the board? Their final position would solely depend on the reflow. A height of 1/8" would be sufficient. I was con
Electronics Forum | Tue Jan 24 18:21:22 EST 2006 | fredc
I have some old Fuji windmills here and I checked the usefull travel. It is approxiamately 1.5mm, the nozzles are suposed to have .3mm "preload" wich will take away from the usable overtravel. The windmill I checked is a reject that from when we rebu
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