Electronics Forum | Tue Apr 27 12:33:37 EDT 2021 | SMTA-64304163
We have some circuit boards with some burnishing on the gold fingers from beveling. Does not go through the gold but is cosmetically noticeable. Is this a defect? Is it rejectable or cosmetic? Can someone tell me where the IPC deals with this? I ha
Electronics Forum | Tue May 08 13:07:33 EDT 2001 | caldon
McMaster-Carr Company http://www.mcmaster.com Pocket Contact file and burnisher Caldon W. Driscoll ACI USA 610-362-1200 cdriscoll@aciusa.org
Electronics Forum | Mon Jul 05 22:21:33 EDT 2010 | isd_jwendell
I have found that lighting for the cam is very important for fiducial recognition. My machine illuminates with a light ring, which isn't so good. However, if I burnish the fiducial with a small fiberglass brush then it works every time.
Electronics Forum | Tue Jul 06 11:58:44 EDT 2010 | baildl632
What type of finish are the PCB's? HASL, tin immersion, silver immersion,........we've seen all the above problems with HASL finished boards. Usually either reheating w/ a soldering iron or "burnishing" with a scotch brite pad has worked for us.
Electronics Forum | Thu Jul 08 23:46:21 EDT 2010 | rdoss
I have this same problems on the flex i use, most of which has an ENIG or immersion silver finish. About the only thing I know to do is have your supplier package it in a vaccume seeled bag to keep it from oxidizing. Otherwise you end up having to
Electronics Forum | Fri Dec 08 13:01:35 EST 2006 | Cmiller
I cant seem to get to that link but we tried everything we could think of and there was no way we found to get solder to adhere to the pads. I guess if you took a burnishing brush and polished the nickel off and got down to the bare copper you may be
Electronics Forum | Tue Jul 06 10:08:20 EDT 2010 | swag
Thanks - we have tried everything you can imagine with machine settings as well as burnishing and flatening fids with irons. I don't want to deal with it in house. The volumes are huge and we don't want to do any touch-ups. I am really looking for
Electronics Forum | Fri May 28 13:03:14 EDT 2021 | cbart
I'm honestly not sure IPC addresses this? the one thing i would ask myself if it were my issue: is the effected area in the critical contact area of the finger/contact? in other words if its low on the finger where the bevel was applied i bet its not
Electronics Forum | Tue May 08 08:41:29 EDT 2001 | caldon
Hmmmmm........I am thinking!!!!! Cleaning is the final process in our situation. After cleaning we have no need for the fiducials. Is the haze causing fiducial recognition problems? Ideally what you are looking for is a contrast between fiducial and
Electronics Forum | Tue Jul 06 12:25:54 EDT 2010 | isd_jwendell
I agree, setting a standard for the pcb fab shop is good. I use a fiducial a little smaller than the spec you mentioned, I use 30 instead of 40 mil, which is the minimum recommended for my machine. The rest of the spec (SMEMA Standard 3.1) appears th
