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1-5 of 5 messages
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SMD Techniques
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by AB8O on July 1, 2008
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Can someone direct me to information about the "Toaster Oven" method of SMD construction. Other methods also welcome.
Thanks
John AB8O
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RE: SMD Techniques
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by W5FYI on July 1, 2008
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The June issue of Nuts & Volts magazine had a neat PIC-controlled toaster oven article that explained the basics of oven reflow soldering (www.nutsvolts.com). Basically, the solder-bearing paste is placed on the PCB pads, the components are are carefully arranged in the proper location and orientation, and the board is heated in a toaster oven to about 405-450°F to melt and reflow the solder. What the PIC-controlled oven does is provide a pre-heat time of about 2-4 minutes, in which the temperature rises to about 300°, then a 2 minute soak time, where the temperature is kept just below 355°, then up to the peak temperature for the actual soldering, which should take about one minute to complete. Ideally, the oven should be able to reach the 400°+ temperature in about three minutes or so.
Of course, you can experiment without the PIC controller. Some experimenters use a non-contact infrared thermometer to keep tabs on the actual board temperatures. Harbor Freight has several inexpensive gun-type thermometers that will work.
What you look for is the paste will become more viscous as the temperature rises, and you may see some components floating on it as they seek orientation with their pads. Just before it "takes," it looks dull gray, then changes to a bright shiny metallic look when it is done.
Needless to say, your hobby oven should not be used to cook food in afterwards. Reflow soldering can splatter solder balls around the oven, and flux and fiberglass outgassing can affect its future utility as a food cooker.
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RE: SMD Techniques
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by AB9IV on July 11, 2008
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If you go to www.stencilsunlimited.com, this web site should answer your questions.
Hope this helps
Craig AB9IV
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RE: SMD Techniques
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by AK2B on July 24, 2008
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http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=36&page=1
http://www.norcalqrp.org/files%5CSMTSoldering.pdf
http://www.zianet.com/erg/SMT_Soldering.html
Frankly, I would forget about the toaster oven and just use a hot plate and air gun.
Tom, AK2B
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