Electronics Forum | Wed Sep 07 09:34:15 EDT 2005 | PWH
Does anyone know of an IPC standard that deals with drilled holes in a PCB in relation to pad location? We have a PCB where the holes are very close to (through the edge of in some cases) a SMT component pad on a PCB.
Electronics Forum | Fri Oct 03 15:51:45 EDT 2008 | davef
We agree with Huss. Your clearance 8 to 11 thou between lead and hole make ion difficult. And that assumes the 0.027 to 0.030" hole size is the finished, not drilled size. It just gets worse if this hole size doesn't consider plating.
Electronics Forum | Fri Jan 21 13:27:38 EST 2011 | mosborne1
Try baking your boards first to remove the moisture. Moisture and boards that have not been drilled properly will cause pin hole or blow holes in PTH. Also take a look the surface of the pads before printing. You maybe contaminating the surfaces of t
Electronics Forum | Mon Mar 05 09:12:58 EST 2018 | proceng1
If it's a plated hole though, you can use the ring around it, which should be as accurate as a copper fiducial. just know that any plated hole with a trace coming off of it will have a "tail" and it might throw the computer off when scanning.
Electronics Forum | Tue Sep 14 07:54:05 EDT 2004 | modwyer
Folks, At the moment I bake all BGA that are in unsealed trays, to reduce moisture etc. Is this common practice or are there particular manufacturuers that cause more problems. Also, the tape for BGA tape & reel has a hole in the tape (as is normal
Electronics Forum | Thu Apr 10 19:21:02 EDT 2003 | tony_sauve
Kevin, One point that I'd like to make is that in order to get an accurate reading of the solder joint temp's you need to have the thermocouple right at the ball/PCB interface. I'd recommend precision drilling a mechanical sample of the unpopulated P
Electronics Forum | Fri Sep 10 12:09:02 EDT 1999 | Earl Moon
| | | hi, i m college student. i m currently doing my Final year project in PCB drilling. the main task is to design auto feeder which allign the PCB properly in position before drilling take place. the close tolerance becomes a big problem to the pr
Electronics Forum | Sun Sep 12 08:20:04 EDT 1999 | se
| | | | hi, i m college student. i m currently doing my Final year project in PCB drilling. the main task is to design auto feeder which allign the PCB properly in position before drilling take place. the close tolerance becomes a big problem to the
Electronics Forum | Thu Jun 28 09:57:50 EDT 2012 | mosborne1
blow holes and via holes are almost always caused by moisture and in PTH they could be moisture and improper drilled holes. If you are seeing solder balls next to the parts than I would say you have a reflow profile problem. Are you using any kind of
Electronics Forum | Tue Oct 07 03:03:06 EDT 2008 | rafacadiz
We had the same problem last year. You need verify these key points. 1- Holes are drill, NOT PUNCH. 2- Inspect 100 Boards at microscope, and verify that there is not rest of fibers in the holes. 3- Meassure the dimensions of the holes. a) virgi
