Re: [CAD_CAM_EDM_DRO] Re: HP 7475 plotter

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