Homebrew PCBs

Great job! looks amazing!
How do you focuse the laser?

--- In Homebrew_PCBs@yahoogroups.com, "Volkan" <v_sahin@...> wrote:
>
> Hi All,
> 
> Recently, I worked on a homemade drum plotter to expose negative acting film. I added some photos under Photo Albums > Drum_Plotter_V_Sahin and there is also a video on youtube 
> (http://www.youtube.com/user/vulcanmicronics). 
> Later, I will add more videos.
> 
> Short performance summary of the plotter
> Resolution 832x2032 dpi
> Optimum exposure time on RLN-4 Film=9.5 microseconds with 405nm 150mW laser.
> Optimum drum speed:~615 rpm
> 
> Thanks,
>  
> Volkan
>