Hi Dave,
I think the rush is over.
We where trying for a ramp up and ramp down on the temperature for a
heat soak then cool off procedure. Using a temp sensors and a feedback
loop we where able to control it somewhat. The problem with the hot
plates is they are not made for precise heating. Some areas are hotter
than others and there are other problems with hot plates. That is why
you see the board being moved is because of the hot spot. A toaster
oven maybe more controllable. Right now it is not perfect but it works
and we have had no problems with any chips. They maybe making
components more robust these days. I am sure our low humidity helps.
The Taig machine was not moving at full speed. The motor we where
using were smaller than we normally use. Just what we had laying
around at the time. We also slowed it down so not to cause any sudden
movement that would drop the surface mounts. The vacuum pump was not
optimal for the application. A better pump and a storage tank would
have allowed a lot fast movement.
Derek B.
www.hightechsystemsllc.com
On 9/20/06, Dave King <KingDWS@...> wrote:
> Ross
>
> Probably already been suggested but why not put them on youtube or google
> video
> then you won't get hassled by isp about bandwidth useage. Or has the rush
> for
> everyone to view subsided? ;-]
>
> How long does it take to do your board for each op (parts, paste,bake)?
>
> Was the machine running full speed?
>
> Dave
>
> clipped