Homebrew PCBs

I'm interested in the optics, too. If we could produce a spot of .001 inch or so, we could use it to remove paint resist from a pcb, just like a cnc router. Then etch and done. The plotter can be a simple xy - used ones with a resolution of .001 inch seem to be readily available.

Mark


-----Original Message-----
>From: Philip Pemberton <ygroups@...>
>Sent: Mar 4, 2011 6:58 PM
>To: Homebrew_PCBs@yahoogroups.com
>Subject: Re: [Homebrew_PCBs] Re: Laser Photoplotter
>
>On 04/03/11 18:40, jmelson2 wrote:
>>> What kind of resolution can you obtain with your plotter?  What dot size do
>>> you get with the 670nm laser and 13mm FL lens?
>> The machine runs at 1000 x 1000 DPI.  I defocus slightly so the raster lines blend in to a solid black.
>
>Is there any chance of you posting some more info about the optics block?
>
>I've been playing around with an RGB laser set (red diode, green DPSS, 
>BluRay/HD-DVD playback diode) and I'm curious how you got the spot size 
>down. The best I've managed is about 0.5mm, which is nowhere near small 
>enough to get any reasonable amount of resolution (about 50DPI by my 
>reckoning)...
>
>Thanks,
>-- 
>Phil.
>ygroups@...
>http://www.philpem.me.uk/
>
>
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