TECHNET Archives

October 2000

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Sara Haima <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 4 Oct 2000 08:09:48 -0700
Content-Type:
text/plain
Parts/Attachments:
text/plain (178 lines)
oh, never mind, i see you did!

-----Original Message-----
From: Larry Koens [mailto:[log in to unmask]]
Sent: Wednesday, October 04, 2000 7:49 AM
To: [log in to unmask]
Subject: Re: [TN] Wave soldering bottom SMT, there's hope!!!


I understand that you can adjust these
pallets to any angle. But, are these
pallets dedicated to a certain assembly
or are they universal and can used on
various projects?

Larry
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On
Behalf Of Stephen R. Gregory
Sent: Tuesday, October 03, 2000 3:52 PM
To: [log in to unmask]
Subject: Re: [TN] Wave soldering bottom
SMT, there's hope!!!


Hey everybody!!

Remember about a week ago I posted about
a little mixed technology board
(actives on the top, passives on the
bottom) that we do here that is laid-out
pretty bad as far as wave soldering
goes, and we have all this touch-up that
we have to do after wave?

Well there's hope. Ed Popielarski
suggested something to me that I didn't
think of. It was using a fixture that
oriented the board 45° to the wave...he
was able to get one for me to try just
to see if it made anything
better...and boy did it!!

Go to:

http://www.driveway.com/share?sid=e25a88
c4.8e904&name=Pictures

You'll see two pictures there, one is:
With45.jpg, and the other is:
without45.jpg...let me tell you, the
Without45.jpg is pretty ugly. I still
did have a few defects with the 45°
orientation, but nowhere NEAR like I was
having before. Most of the defects are
with them pesky SOT-23's, and because
of the layout, I think there's always
going to be some touch-up...

I'm gonna be getting some dedicated 45°
fixtures made for these guys, and
just maybe be able to tweak things even
better!

Thanks Ed!!

-Steve Gregory-

> Hi ya'll!!
>
>  I wished this little beast lent
itself to a selective wave soldering
pallet,
>  but it don't. Go to:
http://www.driveway.com/share?sid=e25a88
c4.8e904&name=
> Pic
>  tures
>  and look at "Funwave.JPG" to see what
I mean.
>
>  You can see by the dime I put there
how big it is. This comes in a 10-up
>  panel. There's about a dozen SOT's,
eleven-1206's, and around thirty-0805's
>  on the backside. Up top there's
three-14-pin, one 8-pin, and one 6-pin
DIP
>  IC. There's also one 5-pin right
angle header, as well as two radial
caps,
>  one axial fuse, and a 3-pin PTH
transistor.
>
>  The 14-pin straddle mount connector
and the two LED's have to be hand
>  soldered because they also straddle
the board. The variable resistor on the
>  backside also is hand soldered
because it can't be waved...fun stuff
huh?
>
>  We do get skips...mostly on the SOT's
that I've seen...Mike said he's seen
>  some on the other passives as well.
We do get other defects because of the
>  layout of things on the bottom. Those
two 1206 caps in the upper right
> corner
>  bridge quite a bit, and there's
always the excess solder on the leading
edge
>  of a component that's oriented the
wrong way to the direction of travel in
>  the wave.
>
>  Me and Mike have been discussing this
wonderfully designed board. My
opinion
>  is that using paste and adhesive may
take care of some of the problems, but
>  with this board there's always going
to be touch-up.

########################################
######################
TechNet Mail List provided as a free
service by IPC using LISTSERV 1.8d
########################################
######################
To subscribe/unsubscribe, send a message
to [log in to unmask] with following text
in
the body:
To subscribe:   SUBSCRIBE TECHNET <your
full name>
To unsubscribe:   SIGNOFF TECHNET
########################################
######################
Please visit IPC web site
(http://www.ipc.org/html/forum.htm) for
additional
information.
If you need assistance - contact Keach
Sasamori at [log in to unmask] or
847-509-9700 ext.5315
########################################
######################

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8d
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following
text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315
##############################################################

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8d
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315
##############################################################

ATOM RSS1 RSS2