Electronics Forum | Thu May 04 12:15:32 EDT 2000 | Charles
There is a hypotheses floating here that the more surface mount components on a PCB, the percent of missplacments goes up. I'm on the receiving end of this, and looking for backup, or argument for the idea.
Electronics Forum | Thu May 04 16:00:07 EDT 2000 | Nick
A Machines reliability will remain the same If it places 25 parts or 25,000 parts. It has nothing to do with "how many parts" but on the repeatability of the machine type. You would notice less misplacements on a low count PBC due to seeing less comp
Electronics Forum | Sat May 06 08:05:31 EDT 2000 | Dave F
Charles: I don't know about machines doing what you're talking about, but I sure I know that I do!!!! Good luck. Dave F
Electronics Forum | Mon Aug 28 15:59:43 EDT 2000 | Tom Humphrey
Can any one give me a list or recommendations of board assembler / manufacturers (Southeast U.S. prefered) who could handle assembly of 2 inch x2 inch PWB with 100+ surface mount components. No testing required. I would appreciate any help or recomen
Electronics Forum | Fri May 05 11:11:05 EDT 2000 | Stefan Witte
The placement defect rate also depends on the shape of the components. 0402's have a higher defect rate than 0805's for example. If the board is very dense populated, chances are that a misplaced part knocks off another part and all of the sudden the
Electronics Forum | Fri May 05 13:42:28 EDT 2000 | JAX
Charles, This theory normally occurs when the machines being used have a CAM style pick-up mechanism( ex. FUJI-CP series). One of the many things that determine cam speed is how many parts out of a single feeder will be picked( It has to build up sp
Electronics Forum | Fri May 05 20:07:26 EDT 2000 | TNT
Charles, The percentage of misplaced components can increase with the number of components, because as you increase the number of placements the travel of the PCB,for a fixed turret machine, increases in table speed and distance. The slower the trav
Electronics Forum | Mon May 08 01:47:56 EDT 2000 | Jack
Charles, I think the misplacement can be devided into 2 groups: 1. parts misplaced by machine 2. parts move as the X-Y table moves If you use the solder paster right, and the place force is properly setup, the second group will be definitely no exce
Electronics Forum | Fri May 21 15:45:29 EDT 2010 | pforister
iv40, Thanks. The PCB that we are populating the BGA hybrid onto does not have holes in the vias. I think the manufacturer indicated that on their hybrid it has holes in pads. This hybrid is a PCB assembly with BGAs and other components populated
Electronics Forum | Mon Feb 26 10:02:27 EST 2007 | Cal
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