![]() I think I paid $60 at Target (local chain - basically WalMart) for this guy : But first, we must purchase and immediately destroy a perfectly good toaster oven! That's where the Reflow Toaster Controller comes into play. By the way, this reflow oven didn't work.Īll we aim to create is an embedded system that takes in temperatures and actuates a relay that controls the heating elements - effectively controlling the temperature. Picture of the premo profile off our $2300 reflow oven. This is all because of a posting on the SFE Support Forum. ![]() All that is needed is a controller to heat the toaster to a specific profile. This is hot enough to melt solder paste allowing home hobbyist the ability to 'cook' PCBs. A toaster can hit 230C with relative ease. These cheap-o units from Tar-chez can cost a meager $50. Don't eat from a toaster oven that's cooked PCBs. #Reflow machine upgrade#Isn't it time for you to upgrade that 56k modem? My apologies to all users still on slow connections.Īll the usual warnings apply: A toaster oven can kill you. I heard Hong Kong is going to Gigabit internet connections. And I'm too impatient to wait for the v2 PCB.Īs usual, there are quite a few photos. Basically, I just want to share the information I have obtained and the layouts I have created. Well, at least not in our 110V fire starter. We are only here to re-hash and hopefully educate those in the art of toasting.Īs of writing - we haven't reflowed anything. There are many more knowledge individuals that pioneered the field. We have really built upon the shoulders of others here. Yes, we have our own reflow oven that cost 30 times as much. Yes, we know others have used toaster ovens for reflow soldering purposes. Nitrogen capable reflow ovens and SMT ovens are typically equipped with an automatic gas sampling system and an Oxygen Analyzer.If you've ever played with SMD devices, you know what a pain it can be to solder tight pitch pins. The Oxygen levels in a Nitrogen reflow process can be as low as less than 10ppm but may be higher than 500ppm for some less critical processes. The use of Nitrogen or Forming Gas is meant to reduce or eliminate oxidation of the assembly during the heating process. A number of specifications are employed including a maximum and minimum peak temperature inside the reflow soldering oven, such as Flux Activation Time (FAT), Time Above Liquidus (TAL), heating and cooling ramp rates, etc.Ī reflow furnace can process circuit boards in air atmosphere or in a controlled Nitrogen or Forming Gas environment. The recipe is optimized to achieve the profile that the solder reflow machine manufacturer has specified for the solder paste that is used on the board. The temperature that the board “sees” as it is processed through the oven is called “ the profile”. The program with the temperatures for all of the zones, as well as the belt ![]() This set point corresponds to the temperature the circuit board should be exposed to as it passes through that zone. During the reflow soldering process, the zones are programmed with a thermal set point. Depending on the length and throughput of the oven there may be few zones, 8 or less, or many zones, 12 or more. Inline reflow ovens are configured with a number of heating zones followed by cooling section(s). The most modern reflow ovens use closed-loop convection. Convection reflow ovens had many advantages including vast improvements in heating uniformity. Later on, the industry, led by companies like BTU International, switched to convection heat transfer. In the early days of electronics manufacturing, infrared (IR) heating technology was employed. For larger manufacturers, an inline or conveyor belt reflow oven is the best choice. ![]() An led reflow furnace can be a small batch (box) style oven for very small lab scale operations. Thermal processing of solder for electronics manufacturing takes place in a reflow oven. ![]()
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