> Roy,
> The machine for changing surface mount chips has a heat gun on
> both sides of the board. The nozzels move together. There is a
> temperature control. The company that makes them is called HART. You
> put a dab of stuff on the chip. When the stuff turns clear the chip
> will lift off. With the heat gun you preheat the bottom of the board
> and then go in for the kill from the top. I mount the board in a bench
> vise so it does not fall. Years ago people used a propane torch. I
> used to worry about hurting parts with heat until I saw a wave
> soldering machine and surface mounted parts being soldered in a
> toaster oven. Some heat guns also come with deflector tips to localize
> the air. The heat gun also works great with shrink tubing and bending
> plastic.
>
> John
>
Yes great tool. you MUST have one with temperature control loop.
If you block the outlet or inlet it must not get any hotter.
This allows for using reduction nozzles and precise temperature.
A goog unit is the steinel with lcd display.
ST