Electronics Forum | Wed Dec 13 16:40:40 EST 2000 | Bill Fluegel
I am receiving a "cognex not found" error upon bootup of a MPM AP24-X stencil printer. I have checked everything I can find between the cognex computer and the one in the machine. Has anyone experienced this before? Any ideas would be greatly appr
Electronics Forum | Wed Dec 13 20:46:46 EST 2000 | Dave F
I�ll bite ... Why can�t you calculate LSL/USL values from your control charts? We find that LSL/USL values generally are unknown. If you are seeking a text on statistical analysis consider: "Statistical Process Control for Surface Mount Technology"
Electronics Forum | Wed Dec 13 16:47:41 EST 2000 | Michael Parker
It is apparent that you have evaporated the flux before you reflowed. You got lucky when the paste slumped and you didn't get major problems elsewhere. A more reliable solution is to adjust the stencil apertures for the part that is experiencing bri
Electronics Forum | Wed Dec 13 18:41:33 EST 2000 | Steve A
Chris, I am not a chemist, but my best guess would be that you were able to remove some of the solvents from the paste flux without exhausting too much of the activators. The loss of solvents could have cut down on violent boiling (violent boiling
Electronics Forum | Wed Dec 13 20:42:57 EST 2000 | Dave F
Material Dk @ 1GHz tan d @ 1GHz Difunctional 4.40 0.020 Multifunctional 4.43 0.018 Polyimide 4.06 0.006 Cyanate ester 3.65 0.005 Bismaleimide triazine 2.94 0.011 PPO-epoxy 3.85 0.012 PTFE-glass 2.60 0.001 PTFE-mat-CE 2.79 0.003 PTFE-ceramic 4.06 0.00
Electronics Forum | Wed Dec 13 10:24:52 EST 2000 | Wolfgang Busko
Hi Jack, I once tried this finish ( without changing any process parameters ) and encountered wetting problems even in the first reflow process. It was thought as cheaper alternative to Ni/Au we use for planarity reasons. Heard of the same problems
Electronics Forum | Fri Dec 15 03:35:10 EST 2000 | JohnW
Dave...think you've gone off on one again..., but if you want th secret family recipe for Haggis let me know....actually catch one 1st then I'll tell you how to cook it! Ok so we've got mixed opinion's on the silver then, and mostly based round SMD.
Electronics Forum | Wed Dec 13 08:28:37 EST 2000 | CAL
1)having the leader tape overlap and taped square is key. 2)making sure the Butt splice of the carrier tape is cut square and come together with no gaps 3) I would put a piece of yellow splice tape on the underside of the carrier tape to help hold th
Electronics Forum | Mon Dec 11 17:09:27 EST 2000 | Michael Parker
Get a profiler for your oven. To say "we are not sure" and "we think it might..." shows you are running with a WAG (Wild Ass Guess). Not a good place to be if you intend to produce anything reliable, with quality. Run your profile and verify that yo
Electronics Forum | Mon Dec 11 20:34:35 EST 2000 | Dave F
I sometimes get "fuzzy" on how different companies differentiate between the activities and responsibilities of various positions. [Read: I don't understand the difference between a manufacturing engineer and a process engineer] Regardless, I'd get
