Electronics Forum: fab notes (Page 1 of 3)

Re: PCB fab supplier supplier/evaluation

Electronics Forum | Sun Aug 08 11:15:32 EDT 1999 | Earl Moon

Mike, Got your message and those of others concerning PCB fab supplier evaluation and qualification check lists, etc. I have a severe problem here in WI as I can hardly access the internet, and when I do it is cut off abruptly for no goo

PWB strain specs?

Electronics Forum | Wed Jul 30 16:57:23 EDT 2008 | stevek

Folks, I'm looking for some specs for the maximum bend or strain that should be put on a PWB. Not looking at the solderjoints. I'm concerned with localized bending of the fab and what might be a reasonable limit for that bending. I've measured 105

PWB drawing note

Electronics Forum | Mon Nov 15 16:23:42 EST 2010 | dpaluck123

I'm working with an aerospace PWB fab drawing from 1994. It contains a note saying "CRUSH ZN .250 DIAMETER" with an arrow pointing to a countersunk or counterbored hole. Can anyone tell me exactly what this means? Thanks

Do you allow manufacturer changes to your PCB design?

Electronics Forum | Mon Dec 02 10:45:04 EST 2019 | slthomas

*You* may be well versed, but not every designer is experienced or even familiar with DFM. I don't care how sophisticated the circuitry is, if you can't build it it's a lousy design, and as an EMS we see many designs that shouldn't have passed the

About the PCB gold finger contamination.

Electronics Forum | Sun Sep 22 13:14:56 EDT 2002 | scottefiske

Stop the lines...! Stop building defects and rework into your product. Contact Fab Supplier and have pipeline filled for small amount of replacement fabs to keep lines running and limiting production scheduling and impact. Request to have the board

Re: Immersion White Tin Process for PCB Finish

Electronics Forum | Fri Jan 14 08:05:23 EST 2000 | Pat Pepper

Hi Dave, Thank you for the response. In answer to your responses I'll use the original numbers of my questions. 1. We would like to turn around our boards fast, but sometimes due to the market conditions we wind up with inventory. After reading

PCB Expansion (Y & X-axis)

Electronics Forum | Mon Sep 26 14:09:08 EDT 2005 | slthomas

"Note: nothing changed to the process, the problem come out of sudden." Did this happen with a batch of boards you'd been running a while, or was it a new batch (lot/date code)of boards? I'd be inclined to suggest that the environment that your my

Re: gerber data vs bare board

Electronics Forum | Sun Sep 12 10:08:55 EDT 1999 | Earl Moon

hello having a problem with one customers bare boards not matching my stencil apertures. i design stencils based on gerber data and reduce up to 15% on some pads. do some board houses reduce pads after receiving gerber data???why would they d

Re: gerber data vs bare board

Electronics Forum | Mon Sep 13 04:11:27 EDT 1999 | Earl Moon

hello having a problem with one customers bare boards not matching my stencil apertures. i design stencils based on gerber data and reduce up to 15% on some pads. do some board houses reduce pads after receiving gerber data???why would

Trying to solder on the solder destination to fill PTHs. Does any IPC standard have requirements for this?

Electronics Forum | Fri Nov 30 12:21:26 EST 2018 | davef

Three things ... 1. Since you are soldering a component over a hole that limits the possibility that the hole could be filled with solder, it makes me wonder if the hole is supposed to be filled with solder. What do the engineering notes say? 2. Ta

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