Electronics Forum | Mon Jan 27 12:27:03 EST 2003 | ksfacinelli
We have an assembly that requires a number of high density connectors to be placed after SMD. The process will not allow a normal wave solder setup due to the population of SMD comps. We cannot use a selective solder pallet due to profiles. We are
Electronics Forum | Mon Jan 27 14:16:46 EST 2003 | russ
i have done this thousands of times. You are correct about no preheat, however it never seemed to be any issue for us. You do have to make sure that you do not expose any SMT comps. to the solder or they will become heat stressed/fractured. Connec
Electronics Forum | Wed Jan 29 14:22:56 EST 2003 | russ
Most bowing I see is caused by an asymetrical layer stackup of the PCB. (different copper thicknesses throughout the stackup) e.g. for a 4 layer board - 2 oz. copper on layer 1, 1 oz. copper on layer 4, etc... I would doubt that is the V-score since
Electronics Forum | Thu Jan 30 15:41:52 EST 2003 | MikeF
The easy part is to determine which parts should be coated. The harder part is making sure the parts that should not be coated do not get coated. I don't even want to think about the amount of labor and materials I've lost due to conformal coat get
Electronics Forum | Mon Feb 03 18:20:57 EST 2003 | Stephen
You mean something like stainless steel balls? I'm racking my brain I seem to remember once doing a job for a customer that involved standing clips being SMT mounted, that a heat sheild clipped onto. Another customer used a "fence" around a bunch of
Electronics Forum | Mon Feb 03 16:56:41 EST 2003 | jonfox
We are currently NOT using bulk, even though we looked into as a means of reducing machine time and component cost. Unfortunately, since bulk cassettes did NOT take the industry by storm as it was predicted years ago, we were stuck with long lead ti
Electronics Forum | Tue Feb 04 17:16:27 EST 2003 | jonfox
If it takes an extra step, then it is costing my company money to pay that person to do that task. Besides, I prefer to keep the stock personnel busy counting reels from shipments and preparing kits for the production floor. Kind of sounds like buy
Electronics Forum | Wed Feb 05 20:56:23 EST 2003 | jonfox
I think you just answered a questioned that I never thought to ask. Are bulk parts manufactured differently than standard tape and reel parts? That would explain why there is a bigger price difference in parts from Murata and not from others. As I
Electronics Forum | Fri Feb 07 17:05:57 EST 2003 | gregp
Pick up correction (as far as position) is already available on newer model chipshooters. This doesn't address upside-down fed resistors. The link I provided for Murata tells a story of increased reliability and reduced cost. As components get sma
Electronics Forum | Fri Feb 07 17:13:59 EST 2003 | Stephen
I don't think it's possible for a turret machine, but I seem to remember some sales guy talking about a camera on his machine that did look at the part before it picked it up. As far as bulk feeding goes, how would you ensure the resistors are right
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