Homebrew PCBs

Jon Elson is the autority, he's done one and he's been using one for 
years. http://pico-systems.com/photoplot.html

I tried to go that route and I am half way through (all hardware is 
completed) with no desire to integrate it at this time. Reason? If I 
say that one more time a certain Alien will ask again about the 
current moon phase and I don't want that to happen.

Mike

--- In Homebrew_PCBs@yahoogroups.com, Cristian <bip@f...> wrote:
> http://www.crystalaser.com/  has QUV 355-25 Crystal Laser of 25mW 
at 349 or 
> 351 or 355nm, just inside the photoresist window.
> I don't know how much it is, for the moment, but the head is not so 
bulky. 
> One can mount it on a CNC Machine easily.
> Of course, some simple optics is necessary, because the beam is 
0.9mm diameter.
> 
> Calculations:
> Photoresist needs maximum 100mJ/cmp, that means 4 seconds/cmp with 
25mW laser.
> That means 240 seconds for 100x60mm. Four minutes of XY Plotter 
work.
> If my calculations are correct, that is not too much.
> Cristian
> 
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