Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "sciciora" <ciciora@C...> wrote:
> Hello!
>   I just made my 1st Photo PCB lasts night.  Turned out great!  
Well,
> actually I did make some PhotoPCBs about 15 years ago, but they were
> very crude.  First I did a test exposure, to see how long to expose
> with my light source.  I uncovered another 1/2" of the PCB every 30
> seconds.  Turns out it needed at least 7 minutes, and 13 minutes
> started to be too long.  Thanks to reading about other people's
> experience, I didn't have any troubles.
> 
> And now for a few questions.  At what point does the PCB stop being
> sensitive to light?  When I put it in the developer?  After it's
> developed?
> 
> I have access to some CNC equipment (Taig with a
> www.CNCOnABudget.com's 30krpm spindle).  Lining up the PCB to be
> square w/ the axis is difficult.  Does anyone drill the PCB before
> they expose it, or before they do the tonor transfer step?  I'm
> wondering how this might work.
I dont think so 
drilling for etching is only done with more than one layer is in use.
> 
> I use Eagle to layout my PCBs.  I was researching their forums, only
> found questions on how to do what I don't want done.  I would like 
my
> pads to be filled in.  For some reason, using my Epson injet 
printer,

go to options / set / misc / select no drills - or do ulp select 
drill-aid and run it 

> with Epson ink and Epson transparancies, the rings around my 
resistor
> pads are too thin.  So I'd like to fill them in.  I can't figure out
> how to do this by doing a File->Print.  In the CAM section, I think 
if
> I output to device PS or EPS (post script printers?) there is a
> checkbox for filling in pads or not, but I don't think my epson 
injet
> accepst postscript files.  Any suggestions?

do ulp select drill-aid and run it
> 
> Also, what to transparancy users do when they have a small board to
> print, and don't want to waste an entire expensive transparancy?  
Cut
> out the size they need and tape it to a piece of paper?  This is 
what
> I use to do when I used DynaArt's toner transfer paper.  Have not
> tried this yet, but I will next time.

You can select the corner in print setup (page) but your idea is also
useble if the right tape (heat resist) is used 
> 
> Thanks for your help,  Your welcome :)
> 
> - Steven Ciciora

gr. Roel
i know me english is bad !