Homebrew PCBs

> I have seen three with stirrers, usually the larger ones have 
> them but i  
> also have a very small very early oven with one.
> 
> IMO the superior method over the turntable, but a bit more tricky  
> technically.
> One i looked into used a plastic ball bearing (just like 
> metal only clear  
> balls). I suspect the metal ball bearing would cause arcing 
> and wouldn't  
> work. The stirrer was powered by the cooling airflow (so the 
> friction  
> needs to be low).
> 
> ST


The small one I saw had the stirrer run off the airflow.  I suppose that
would clog up the bearing eventually.  Makes sense that they'd work better,
fewer cold spots.

A quick rummage around Google shows stirrers are still around.  Some models
have them in the sides as well.  These are commercial ones, and are driven
by motors (with belts).

Tony