Homebrew PCBs

At 8:14 am ((PST)) Fri Nov 17, 2006, john80014 wrote:
>3a. Re: Any info about this technique?
>     Posted by: "john80014" jhewatt@... john80014
>     Date: Fri Nov 17, 2006 8:14 am ((PST))
>
>Copper is used as a reflector in CO2 lasers.  Most materials will
>absorb CO2 emissons.
>
>A 60 Watt CO2 laser would blow holes through the fiberglass in a
>heart beat.   Generally you will use a focusing lense to narrow the
>beam and intensify it.  with a 2.5 inch focal length you would
>probably get a .003 - .004 spot size.
>
>A 100 Watt CO2 cut .025" mild steel @ 130ipm using a 40psi O2 assist
>
>Cutting FR4 with 60 Watts,  probably 40 ipm using 50-60 psi of air
>assist

You won't get anywhere near as much energy assist from
burning(?) FR4 (Fire Resistant grade 4) fibreglass in 60psi air
as from burning molten steel in 40psi O2. Do you have
experience or references to support the above cutting speeds?


Regards, LenW