--- 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 !