The theory is sound, but I believe you're going to have to improve upon the
alignment accuracy that was originally in the printer to make usable
double-sided prints...most laser printers I've encountered have variations
in the printing alignment of well over 2mm from one page to the next. This
kind of deviation would be imperceptible when printing documents, but
unusable when trying to align boards.
I suspect you can probably overcome this with some clever timing in your
MCU. Off the top of my head, running the board though a photointerrupter
instead of using a mechanical alignment switch would probably improve
accuracy.
-Andrew
On Thu, May 13, 2010 at 4:04 PM, Mark Lerman <mlerman@...> wrote:
>
>
>
> I have the theory for ds worked out, but I haven't implemented
> it. The X axis is fixed by the paper guide, but will probably need
> to be changed to something longer. The Y (motion) axis needs a sensor
> that tells the mcu when the moving pcb has reached a point
> approximately where the Paper In Sensor was. It is this sensor that
> (I think) starts the timing for the actual print. A slot in the
> carrier with an optical sensor should work fine. The rest is just a
> tweak in the software.
>
> Mark
>
>
> At 02:19 PM 5/13/2010, you wrote:
> >That sure looks GOOD!!! If my Toner Transfer wasn't working so good
> >I'd sure be looking at your process - Didn't you say you are still
> >working on getting double sided to line up?
> >
> >Thank you for sharing all your GREAT work.
> >
> >Ken H>
> >
> >
> >--- In Homebrew_PCBs@yahoogroups.com <Homebrew_PCBs%40yahoogroups.com>,
> Mark Lerman <mlerman@...> wrote:
> > >
> > > I have posted the final pictures of the process, including a photo of
> > > the first board run through the converted printer. If anyone is
> > > pursuing this technique, please let me know how you are doing.
> > > <http://www.pbase.com/mark10970>
> > >
> > > Mark
> > >
> >
> >
> >
> >
> >------------------------------------
>
> >
> >Be sure to visit the group home and check for new Links, Files, and
> Photos:
> >http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
> >
> >
> >
>
>
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