Printed Circuit Board Assembly & PCB Design Forum
SMT electronics assembly manufacturing forum.
Hi,
I have checked the archives, but need some advise.
...
- Dec 16, 2002
by
Grant
Are you using "on-contact" printing?
(is the stencil touchi...
- Dec 16, 2002
by
k_h
What paste are you using?
...
- Dec 16, 2002
by
square apertures provide better paste release than round in ...
- Dec 16, 2002
by
PeteC
Hi,
Yes, the stencil does touch the PCB. Is there another...
- Dec 16, 2002
by
Grant
Hi,
We tried AIM no clean, and one other paste which I ca...
- Dec 16, 2002
by
Grant
Hi,
Thanks for the info, and I will check it out. Do you ...
- Dec 16, 2002
by
Grant
Personaly I would try a different solder paste. Give Indium ...
- Dec 17, 2002
by
Are your stencils electropolished?
I still haven't used an ...
- Dec 17, 2002
by
Square apertures can have a larger area within the same spac...
- Dec 17, 2002
by
davef
Check :
1) design aspect ratio / are ratio required to fa...
- Dec 17, 2002
by
iman
I dont know what kind of screener you use but my 1st impress...
- Dec 18, 2002
by
One thing that will also cause this is very slight stencil m...
- Dec 18, 2002
by
Sr. Tech
That issue (gasketing is what I usually see it called) was t...
- Dec 18, 2002
by
Steve Thomas
I have had a similar problem in the past, since I have never...
- Dec 18, 2002
by
swagner
You can also get that IPC standard in the SMTnet Bookstore (...
- Dec 19, 2002
by
Brian Doyle
Really? Where does it say that? I have had the opposite expe...
- Dec 19, 2002
by
Guy
Huh?!
The area of a square that fits in a circle is clearly...
- Dec 19, 2002
by
Guy
Your area ratio for this aperture is fine (.78) usually any ...
- Dec 19, 2002
by
RDR
Now, this is good solid advice. If following this advice doe...
- Dec 19, 2002
by
Guy
We actually look at it like this, The area of a circle that ...
- Dec 19, 2002
by
RDR
It sounds like the stencil wasn't polished. Most stencil sou...
- Dec 19, 2002
by
It sounds like the stencil wasn't polished. Most stencil sou...
- Dec 19, 2002
by
Hi Grant Petty,
I read about your problem, You might have...
- Dec 19, 2002
by
Armando
Although everything that has been said earlier is sound advi...
- Dec 20, 2002
by
Check your stencil apertures making sure they are trapazoida...
- Dec 20, 2002
by
The easiest simplest solution i can think of is the Print pl...
- Dec 21, 2002
by
Hi:
Your stencil specs are good;
Did you check the stenc...
- Dec 22, 2002
by
I am breaking a cardinal rule with this reply, but here goes...
- Dec 22, 2002
by
valuems