Re: gEDA-user: Another board with gEDA/PCB

[Stephen Meier <smeier@xxxxxxxxxxxxxxxxxxx>]

I am interested too in how you alligned the bga to the pcb. One problem 
with high density components is that they were at 1 mm pitch... no 8 
mill pitch flip chips... no 6 mill pitch flip chips...

Still if you did the alignement and then had a reasonable yeild (>50%) 
then I take my hat off to you. My point has been that these tools are 
capable of professional (whatever that meens) capabilities.

Again, Darrell... I do congradulate anyone who can build boards with 
high density components in less then ideal conditions.

Taking a bow,

Steve Meier




Darrell Harmon wrote:

> Dan McMahill wrote:
>
> > Darrell Harmon wrote:
> >
> > > Stephen Meier wrote:
> > >
> > > > Let me echo ...hello.....hello....hello...
> > > >
> > > > I have had very complex board built with these tools. If the boards 
> > > > anyone else is trying to build dont work it is probably do to the 
> > > > manufacturing process of the boards and not due to the design 
> > > > tools. Hey if you can attach a bga with a toaster more power to you 
> > > > (or the oven got the bread the right collor of brown). using 
> > > > companies that are good at depositing 900 pin bgas has been 
> > > > successfull.
> > > >
> > > > Steve Meier
> > > I did successfully attach the BGA using a $20 toaster oven.  I used 
> > > a MAX6675 thermocouple to SPI converter connected to the parallel 
> > > port of my laptop along with a relay to switch the power to the 
> > > oven.  I set the oven on broil and got mostly infrared heating.  I 
> > > can post the temperature profiles if anyone is interested.
> >
> >
> >
> > I'd like to see the profile.  Now when you outfit your toaster oven 
> > with ethernet, then I'll be impressed ;)  Still, thats pretty cool.  
> > I take it that you're actually regulating temperature not just 
> > monitoring it?
> >
> > -Dan
> It will probably be late Saturday night or Sunday afternoon, but I 
> will post the profiles, schematics and code (none of it is on this 
> computer).  I just used simple thermostatic control (no PWM) and it 
> stayed within 2 degrees C of where I wanted it to be when it could 
> keep up.  I only got about 0.5 to 1 degree per second.  I may move the 
> lower heating element (quartz tube) up to the top to double my heating 
> power or even buy a second oven for more elements.  Even with this 
> slow heating, not even the connectors were damaged.