Electronics Forum | Wed May 19 10:35:37 EDT 1999 | Jeffrey L. Gumm
Trying to find a manufacturer with the capability to hold a registration tolerance of +/- .001" in LPISM. To be done on ceramic substrates, with a maximum panel size of 5.0" x 7.0".
Electronics Forum | Tue Jan 30 15:31:07 EST 2007 | slthomas
The must-do is to inspect for coverage and registration. How much bare pad and registration error you can tolerate is process and product dependant, but you can measure both fairly accurately with a reticle on a microscope. Developing measurement te
Electronics Forum | Tue Feb 20 15:23:28 EST 2018 | dleeper
Proper fiducials are going to be more accurate than drill holes. Since drilling is a separate step in the PCB fab process, the registration to the PCB isn't as accurate as the copper etching process which forms the fiducials. In a pinch, it can be u
Electronics Forum | Tue Nov 13 22:40:02 EST 2012 | davef
I expect that suppliers can just about always hold solder mask registration within a true position of 3 thou. That's the old SMT padstack think ... make the solder mask openings extend 3 thou larger than the copper. That way, even if the copper and t
Electronics Forum | Sat Apr 03 19:58:53 EST 2004 | Ken
I have used tooling holes and fiucial registration since the late '80's. In fact if your maximum "vision" tolerance is +/- 0.05mm, your in the same ball-park as locating pins. It is true that fiducial registration is more accurate. However, I woul
Electronics Forum | Wed Sep 19 13:43:49 EDT 2001 | jschake
I cannot report having experience with 0201 printing applications on flex circuits. Generally, I would be concerned with handling of the flex substrate. A carefully designed vacuum capable custom tooling fixture would likely be required to ensure p
Electronics Forum | Thu May 10 13:58:26 EDT 2001 | tomgervascio
It sounds like 3D imaging is much better at fault detection for partially visible leads like SOJ packages. Can any of the 2D systems actually do a solderjoint inspection on the outer rows of BGAs or is the angle too acute to accurately look at these.
Electronics Forum | Wed Dec 19 15:43:23 EST 2007 | cdsullivan
Hi, I was just wondering what the most common process is for silkscreen/legend removal and/or rework? Scenario: Fab house had a registration issue on some SOT-323 packages where the silkscreen encroached or was actually printed on the surface pads
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 | 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
