Re: [CAD_CAM_EDM_DRO] Re: HP 7475 plotter

Just a heads up... The subject of PCB milling and using Plotters for plotting directly using pens as resist etc etc
has been cover int great details during the past 6 months.

Homebrew_PCBs@yahoogroups.com

Best Regards
Hans W

Bill Higdon wrote:

> Hey Dangerous Dave,
> There was an article in on of the Ham magazines back in 1977 that did
> this. The trick was to use one of the reillable non fiber pens. You
> replaced the Ink with a paint and used the paint as a resist. I'll try
> and find it for you. As formilling a PCB how about the disposable drill
> air turbo\ine some of the dentists use?
>
> Bill Higdon
> turbulatordude wrote:
> > if you want another, let me know. I do not know if they work, but
> > would be good for spare parts.
> >
> > BUT, if someone figured out how to hack these for SLOW speed to use
> > as a PCB marker, or etcher they could be of good use.
> >
> > right now, there is a guy on e-bay with thing boards, 20 thou. that
> > would probably about the thickness these could handle.
> >
> > Ideally, someone could make an interface that ran them from a CNC
> > package. drilling would be the problem as I see it.
> >
> > Dave
> >
> >
> >
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, Alan Marconett KM6VV
> > <KM6VV@a...> wrote:
> >
> >>Hi Marv,
> >>
> >>Couldn't have been that much! I bought one in '84. Maybe $1400
> >
> > LIST,
> >
> >>don't recall. I got in under an HP employee discount. I still have
> >>mine. "PRINT" under most windows programs often offers a variety of
> >>printers, including HGPL, and you can usually select save as file.
> >>Print to this file, then "copy" file to comm port.
> >>
> >>I can watch the plotter for hours! I had thought of getting
> >
> > another one
> >
> >>(surplus), and using the parts.
> >>
> >>Alan KM6VV
> >>
> >>
> >>Marv Frankel wrote:
> >>
> >>>Jan,
> >>> A number of years ago I used that model plotter at my
> >>
> > office, and if I
> >
> >>>remember correctly, it cost about $4,000 to $4,500. It was just
> >>
> > great, until
> >
> >>>the inkjet plotters took over. Where a pen plotter took 45
> >>
> > minutes to do a
> >
> >>>large plot, the inkjet took about 5 minutes, and then along came
> >>
> > the
> >
> >>>electrostatics, etc. etc. etc...........
> >>>
> >>>Marv Frankel
> >>>Los Angeles
>
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