--- In
Homebrew_PCBs@yahoogroups.com, Adam Seychell <a_seychell@y...>
wrote:
>
> roel_cnc wrote:
> > i like the idea of making me own laserplotter.
> >
> > tested: a pointerlaser (some cheap thing) with an extra focus
lense, a
> > red sensible film gave me super fine lines (close to a single
cloth
> > fiber).
> >
> > did any of us fouling around with this idea !!
> >
> > tips and suggestions always welcome:)
> >
> > gr Roel (holland)
> >
> >
>
> Are you talking a rotating drum laser photoplotter ?
>
> Any idea of suitable low cost (<$5 A3 sheet) red light
photosensitive film ?
>
> There is also the problem of developing red light sensitive films!
>
> Alternative is green, blue or even UV laser diodes. Choice depends
on
> photofilm and laser diode availability. Maybe the best approach is
to
> look at traditional black&white photographic films, and then decide
on
> suitable laser diode wavelength. Use common B&W films that are
processed
> with a standard red safe lights.
>
> At say 20um wide pixel, that gives 15000 drum revolutions to scan a
> length of 300mm. If drum spins at 1000 RPM, thats 15 minutes to
> complete, which is acceptable.
> Regarding film mounting, it is ideal to have the film placed on the
> inside of a drum cylinder. The drawback with this approach is
building
> single sided bearing mount system for the drum. I guess thats all
up to
> degree of mechanical balancing.
>
> Would be interesting hearing ideas too.
>
> Adam
>
hi Adam,
Drum type would be nice but controlling and software tooks a great
deal of time to create i think !
must be somthing like a tv set creating a image on the screen with
sync goto next line :) lol
gr. Roel