2 Apr
2017
2 Apr
'17
6:37 a.m.
On Apr 2, 2017, at 12:51 AM, Jon Elson via cctalk
<cctalk at classiccmp.org> wrote:
On 04/01/2017 11:27 PM, Chuck Guzis via cctalk wrote:
I have a nice article about toaster oven SMD work. It's in German, via the PCB Pool
website if I remember right. It mentions that problem. The solution picked in that
article was to use a spare board (same or similar layout) as the thermocouple holder. But
attaching to the actual board sounds good.
paul
What do you do about boards with SMT components
on *both* sides? I can't see how it would work with a toaster oven.
OK, this is
going to be long.
I do small-scale production of mostly motion control boards, but also some nuclear
instrumentation. Mostly 0603 to 0805 passives and SOIC up to 0.5mm pitch QFP chips. I
use a lot of FPGAs in 144 pin packages.
...
One of the tricks I found out very fast was the thermocouple doesn't absorb IR the
way a board does, the first board I did came out warped like a potato chip and nearly
black. It occurred the me to poke the thermocouple junction into a through-hole in the
board, and then it all worked. I still have some slight problems with some areas of the
oven running a bit cooler or hotter, so I have to tweak the peak temp setting sometimes to
get all the boards soldered.