Well if you look at the thingy in my first post the 5000$ one. Take out the heating element (and put it in a standard toaster oven)
Now every thing thats left , is what i just built above. The insides that read the temp of the oven, decide if its to hot or cold, and effect the power in the outlet accordingly. (not like a dimming light switch, like a light switch on or off).
Effectively the circuitry to do that is about 50 - 100 $ including the needed parts. Throw it in a cheapo pc case for saftey and looks. Hack a toaster oven to be on 100% power , 100% of the time it has power on the cord even if the door is open and plug it into what i made and jualla a 5000$ reflow oven.
A reflow oven does this:
Ramps up to a "soak" temp
sustains this temp for like 1:45seconds
ramps up to reflow temp (leaded solder is lower then non leaded)
The way it works is you take a scringe and put paste on the board like glue for the parts.
Then stick the parts on.
The paste is made of solder melted up and made into microscopic beads (or tiny balls) surrounded by a catalist to hold it together (the sticky part)
When you cook the board to a specific reflow profile the paste evaporate as the microscopic beads of solder melt. When it cools it looks like the circuit boards in your store bought electronics.
You can also use a stencil, and basically screen print the paste on. this method does all parts in one swipe.... but stencils are bout 600 $.
NOW you understand what it does
If you only have one part a 50 $ heat gun should work , if your lucky.
You can also use a toaster oven and a temp probe for hodge podge results. but its a pain in the ass for small run fab.
