Hi Roman

I worked for a company that used a simple grill as a reflow oven.
Basically it's a heating element supported above a structure that allows =
a pan
to be positioned at three different heights below the element.
Sometimes it's referred to as a TV grill.
The two 'tricks' to the process is to have the correct size pads on the =
board, and
to "pre heat" the board properly.
The pad size is important, because as the solder paste melts and forms a =
bead,=20
the surface tension drags the component to the correct place, thus =
allowing for=20
inaccurate manual placement of the components.
The pre heat stage was basically placing the tray containing the =
board(s) on the
lower shelf for 2 minutes.
The idea is to heat the components slowly to reflow point, thus =
releaving the thermal stress
of hitting them with the reflow heat immediately
After the pre heat, the tray is moved to the top shelf for no more than =
30 seconds.
Jolting the boards isn't realy a problem because the aforementioned =
surface tension tends
to be quite tenacious at holding the components if the pads are =
correctly designed.

Cheers
Mark

PS off topic question for you Roman. What TV standard is used in =
Australia?
I need to send a video tape to someone in Australia, and I'm not sure if =
it's compatable.    =20
---------------------------------------------------------------------
Mark Hull
Engineering / Technical
EMS (Africa) (Pty) Ltd
PO Box 1026, Melville, 2109, South Africa
Ph + 27 11 482 4470, Fax +27 11 726 2552

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