westfw wrote:So what do you do to avoid fires in particularly flammible materials? I've been wondering whether a laser cutter would be able to cut particularly THIN materials that would otherwise be a pain (tissue paper, for instance), and keep wondering "won't it just catch fire?)
Ferrari's could go 180mph, but that doesn't mean you always have to :wink: , and if you are doing so its generally advised that you pay attention. Me personally, I drive a car that can barely keep up with traffic and my laser is only powerful enough to amuse the hell out of people, not burn them.
As for how and why thin paper doesn't burn up (from somebody who can only cut such materials) the energy is being concentrated into a small area. It will burn through that area and then is more or less no longer impeded so the paper isn't being heated enough to burn further. Now I think the whole fire issue stems from the fact these thin papers are sitting on aluminum tables when being cut. The lasers aren't powerful enough to burn through them, but enough to heat them up quite a bit. Aluminum is also a good conductor of heat, so this is then spread out to a larger area. The rest I think you can think of on your own.