Now that the solder stencil is ready for use, I went ahead and tried it – using solder paste and a (not-so-wide) squeegee type tool. Here’s the result:
If you look closely, you can see how nicely the paste ends up on the pads:
The stencil needs to be cleaned for future re-use, though:
(sorry for the incandescent light reflection)
Ok, now the tricky part – the “pick and place machine” (me). The result:
That’s the illuminated magnifying glass I’m using, by the way.
Looks perfect to me:
Baking now, in my JeeNode-based reflow controller:
Hm, this stuff is considerably smellier than before. Here’s the result…
Wait a minute – if you look closely you can see that a lot of the pads show up as a gray surface, not the shiny metal I was expecting!
WHOOPS – I used a temperature profile for leaded solder, but this is lead-free solder – silly me!
Stay tuned for the rest of this story… tomorrow.