Homebrew PCBs

Thanks for the comments, Stefan. I like the idea of preshrinking the 
paper same principle applies to new cotton shirt, that mother used to 
buy a size larger tocompensate for that shrinkage. Attached PCB looks 
to me quite nice. Mike

--- In Homebrew_PCBs@yahoogroups.com, Stefan Trethan 
<stefan_trethan@g...> wrote:
> On Thu, 29 Jul 2004 13:02:48 -0000, mikezcnc <eemikez@c...> wrote:
> 
> > a bit of a joke on my part, Stefan, no harm intended.
> >
> > TT is working for me also very well, but I am concerned with what
> > what Jeremy said that he measured the heat distortion of a laser
> > print out and it is something on level of 0.010 if I rememebr
> > correctly. Stefan, do you make SMD boards also?
> >
> > The fact that Marcus is making 4 layer boards is an incredible 
news.
> >
> > Mike
> >
> 
> I'm also concerned about distortion, but i found something more 
unsettling
> last time making a board. the fuser/laminator to transfer made
> the paper shrink about 1mm on 100mm length. (i discovered that when 
trying
> to align a "silkscreen" component legend on the etched copper side).
> There is definitely some more measuring needed.
> First to determine how much distortion the laser itself has and 
then how 
> much it
> is harmed by the laminator. I believe passing the paper through 
before 
> printing
> would "pre-shrink" it and lessen the effect.
> I'll let you know when i had time to do a few testprints.
> 
> As for SMD - i prefer it 'cause i don't like the drilling.
> Populating/soldering too is easier and faster.
> There are certain parts i use throughole (old stock, salvaged, high 
power 
> parts,
> mechanically strained components) but when there is SMD in my 
storage i'll 
> use it
> and it is definitely preferred when buying new parts.
> I have no trouble with the resolution as 6,66mil is the limit (my 
printer).
> There is a point where you have "ideal" single-layer boards, which 
in my 
> opinion
> is throughhole ICs and SMD passive components. this allows for 
easiest 
> routing.
> More SMD makes it harder again.
> You can see a very simple (1206) SMD board witht the alignment 
problem at
> <http://stud4.tuwien.ac.at/~e0225977/pub/comp_bot.jpg>
> sorry, i have no picture of finer art at the moment but it is 
easily 
> possible.
> 
> ST