My dad was an engineer at Hughes Aircraft in the semiconductor division (did you know they had one?) and had to troubleshoot a number of problems. The worst one was when the metallic vapors that were deposited on the wafers stopped sticking to the surface. After much investigating, dad found out that the night crew was using the ovens to heat up their chicken, burritos, etc... and the microscopic volume of grease was plating onto the inside and then coating the wafers along with the metals during production. No metal vapor in the kitchen, no food in the clean room. James Newton, PICList Admin #3 mailto:jamesnewton@piclist.com 1-619-652-0593 phone http://www.piclist.com ----- Original Message ----- From: Barry Gershenfeld To: Sent: Monday, July 02, 2001 12:15 Subject: Re: [EE]: SMT Toaster Oven >Has anyone thought of making something like what the pizza delivery >places use? Put the board on a conveyer on one side, it goes through the >oven at a set rate and comes out the other side nicely baked. Seems like >it would be great for production work. Wait a minute...these are real. They are called convection reflow ovens and the only difference is they are longer. You can have "zones" and a temperature profile (curve) as the board goes through. It's the kind of thing you need if you ever get into BGA chips. Now I know the idea works in reverse--I always suggested running pizzas through the thing...then I read somewhere that someone was doing that and they found that the residues had an effect on the solder joints when they went back to using it to do boards...oh, well. Barry -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics