Hi everyone,
I have been into CNC for several years, have scratch built wood router and plasma tables that I use regularly. I want to get into cutting/engraving with a laser. After weeks of research, I have come up with a list of what I *think* I have learned but would like to ask you all to comment wherever you can on my list! As always, I appreciate the help! (Sorry for the long post!!)
1) I have read that cutting and engraving are best done on dedicated machines designed for each type of work. But I understand that you can accomplish both to a degree with one machine, possibly not with the BEST results, but workable.
I'd like to cut Plexiglas as my major use of the tool, but wouldn't mind etching glass and or tile.. does this seem feasible?
2) Given that my main goal is to cut plexi (mostly in the 1/4" range), I am considering a 40 watt laser tube and supply (adjustable current output) to start with to keep costs a little lower while I learn. One thing I can't seem to find data on is if this is adequate power to engrave with? I have found much on cutting plexi with this power laser and although a little slower, seems adequate.
3) I insist on building the machine myself (probably using 80/20 this time). I know there are Chinese machines out there that are cheap and easy, but half the learning is by building it. I understand the concepts of this and where all the mirrors need to go etc... wondering if there is any advice on what to do or not to do in this area? (Outside of the standard safety issues please, I realize that "playing" with a high power CO2 laser is very dangerous and it doesn't take much work to accidentally shoot the beam somewhere it doesn't belong causing great damage)
4) Focusing optics are something I can't seem to find info on. I understand what they do, and how they do it... but how do you determine what focal length you need for your machine? I understand optics with an air nozzle are just about a must.... what kind of air pressure does this require? Are optics from China reasonable to consider?
5) If anyone has any resources to point me to to continue learning "the basics", I'd be very happy to spend the time reading on my own, I am just starting to hit a brick wall with finding these things on the net!!
Thanks everyone, I appreciate any input and advice!
-James