Searching \ for '[EE]: Do you solder SMD inside toaster ovens ???' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: massmind.org/techref/index.htm?key=you+solder+smd+inside
Search entire site for: 'Do you solder SMD inside toaster ovens ???'.

Exact match. Not showing close matches.
PICList Thread
'[EE]: Do you solder SMD inside toaster ovens ???'
2000\12\27@143109 by steve

flavicon
face
> Another prototype method is to get a hot air rework gun.  I've heard people
> say this is a very effective way of doing one-off surface mount.  I have
> tried a heat gun not made for the purpose, and ended up torching the boards,
> so don't try this without the proper tools.

I use a Black & Decker heat gun and do several hundred small boards a
month with it. It's not ideal but it can do a good job with a bit of
practice. I set it on max heat & min blow (I would rather there was
less blow) and perfected my technique by connecting a thermocouple
directly to a scope. From that I was able to determine what height
and angle to hold it and the speed to move it to get a nearly perfect
profile. There are quite a few factors involved (like how much ground
plane is on the board) but I'll do up 4" x 6" boards with almost no
soldering failures or cooked components. The finish is much nicer
than a hand soldered board.

It's also very educational to see the solder go through its phases
and how that can apply to board design and other DFM matters.
Most people have heard how the solder surface tension will pull a
part on to pads, but nobody seems to mention that prior to that, the
solder paste becomes very liquid and the component floats on top of
it. During that phase, any disturbance can move a component very
easily and cause a misalignment far greater than the surface tension
will be able to re-align. This is a problem with the heat gun so I
tack one pin of ICs (the worst offenders) to hold them
during that phase.

I've been experimenting with modifying a pop-up toaster and although
there is still a way to go, it's looking quite promising. The pop-up
toaster has the advantage that the air volume to be heated is small
and the elements have very low thermal mass, making it easier to
control.

> I had to practice several times on scrap boards before I got it right.

That's an understatement. I have quite a collection of cremated
boards. There isn't much between the solder melting point and FR-4
combustion.

And before anyone asks - The toaster lays on its side and will still
pop out when the board is done (and cooled).

Steve.

======================================================
Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680, New Lynn      http://www.tla.co.nz
Auckland, New Zealand        ph  +64 9 820-2221
email: spam_OUTstevebTakeThisOuTspamtla.co.nz      fax +64 9 820-1929
======================================================

--
http://www.piclist.com hint: To leave the PICList
.....piclist-unsubscribe-requestKILLspamspam@spam@mitvma.mit.edu


2000\12\27@160321 by David VanHorn

flavicon
face
>
> > I had to practice several times on scrap boards before I got it right.
>
>That's an understatement. I have quite a collection of cremated
>boards. There isn't much between the solder melting point and FR-4
>combustion.

I'm doing that here!
(E-Z-BakespamKILLspamegroups.com?)

Do you have a top element? I put a piece of foil in mine, to keep the
direct IR off the board, which seems to help a lot. I'm not toasting any
boards :)


--
Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9

--
http://www.piclist.com hint: To leave the PICList
.....piclist-unsubscribe-requestKILLspamspam.....mitvma.mit.edu


2000\12\27@165810 by steve

flavicon
face
Hi Dave,

> I'm doing that here!
> (EraseMEE-Z-Bakespam_OUTspamTakeThisOuTegroups.com?)

Couldn't find that on Egroups. Is there a typo ?

> Do you have a top element? I put a piece of foil in mine, to keep the
> direct IR off the board, which seems to help a lot. I'm not toasting any
> boards :)

Many of my carbon-epoxy lifeforms are semi-intentional. All part of
experimenting with the elements and measuring/observing.
The foil is a good idea. I had a play with using an empty element
former between the board and the element but it negated the advantage
of the faster toaster element. The foil might be a good compromise.

I'm using the top element mounted on an angle to compensate for the
uneven windings. At least, that's where I got up to before it got put
to one side.

IMHO, it's worth getting a toaster just to pull the element formers
out. They are really useful for the heat gun method as well as
resting all sorts of hot things on.

Steve.
======================================================
Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680, New Lynn      http://www.tla.co.nz
Auckland, New Zealand        ph  +64 9 820-2221
email: stevebspamspam_OUTtla.co.nz      fax +64 9 820-1929
======================================================

--
http://www.piclist.com hint: To leave the PICList
@spam@piclist-unsubscribe-requestKILLspamspammitvma.mit.edu


2000\12\27@170818 by David VanHorn

flavicon
face
At 10:57 AM 12/28/00 +1200, Steve Baldwin wrote:
>Hi Dave,
>
> > I'm doing that here!
> > (KILLspamE-Z-BakeKILLspamspamegroups.com?)
>
>Couldn't find that on Egroups. Is there a typo ?

I haven't created it yet, but I was thinking that it might be a good idea!


--
Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9

--
http://www.piclist.com hint: To leave the PICList
RemoveMEpiclist-unsubscribe-requestTakeThisOuTspammitvma.mit.edu


2000\12\27@171444 by David VanHorn

flavicon
face
At 10:57 AM 12/28/00 +1200, Steve Baldwin wrote:
>Hi Dave,
>
> > I'm doing that here!
> > (spamBeGoneE-Z-BakespamBeGonespamegroups.com?)

It exists now.

--
Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9

--
http://www.piclist.com hint: To leave the PICList
TakeThisOuTpiclist-unsubscribe-requestEraseMEspamspam_OUTmitvma.mit.edu


2000\12\27@171647 by David VanHorn

flavicon
face
At 10:57 AM 12/28/00 +1200, Steve Baldwin wrote:
>Hi Dave,
>
> > I'm doing that here!
> > (RemoveMEE-Z_BakespamTakeThisOuTegroups.com?)
>
>Couldn't find that on Egroups. Is there a typo ?


Revised spelling: E-Z_BakeEraseMEspam.....egroups.com


--
Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9

--
http://www.piclist.com hint: To leave the PICList
EraseMEpiclist-unsubscribe-requestspammitvma.mit.edu


2000\12\27@182619 by Robert Rolf

picon face
Really?

Oops...

    There is no group called E-Z-Bake.

How about posting the full URL?

David VanHorn wrote:
{Quote hidden}

--
http://www.piclist.com hint: To leave the PICList
RemoveMEpiclist-unsubscribe-requestTakeThisOuTspamspammitvma.mit.edu


2000\12\27@183040 by Robert Rolf

picon face
www.egroups.com/group/E-Z_Bake


David VanHorn wrote:
{Quote hidden}

--
http://www.piclist.com hint: To leave the PICList
spamBeGonepiclist-unsubscribe-requestSTOPspamspamEraseMEmitvma.mit.edu


2000\12\28@190136 by Peter L. Peres

picon face
>Revised spelling: KILLspamE-Z_BakespamBeGonespamegroups.com

Are you trying to make me break my fingers typing, or what ? ;-) Try
SMD-Bake or something more suggestive imho.

Peter

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


More... (looser matching)
- Last day of these posts
- In 2000 , 2001 only
- Today
- New search...