If you are working with your laser engraver/cutter and suddenly hear a loud BANG!, altough the machine might still be lasing, stop it!
I didn’t inspect my machine thoroughly enough, and a few days later, while working, I notticed an extreme reduction in performance. To my surprise, the primary reflection lens was cracked, and at full power, a spot in the glass was glowing red! I stopped the machine immediately, but learned that loud bangs, always mean something is broken, no matter what.
The fun side? I managed to get the machine working with half a mirror. It has enough area to reflect the whole laser beam, so the machine is working perfectly. (replacements already ordered)
Also, for those wanting to know some cutting settings for that type of machine:
3mm Acrylic: 8mm/s (15mA)
5mm Acrylic: 3mm/s (15mA)
3mm Laser grade PLYWOOD: 10mm/s (15mA)
6mm Laser grade PLYWOOD:2mm/s (15mA, Air assist)
3mm MDF: 10mm/s (15mA)
Engraving BALSA: 30cm/s (4,75mA)
Oh, by the way, this is a second degree burn on my finger, for inadvertently putting it in the middle of the beam while aligning the mirrors.
Yes, my bad, altough I try my best to observe protocols, I was careless because I was more concentrated on trying to use the half mirror and get the machine going while waiting for new mirrors. As they say, never again.
Also, KEEP IN MIND, this was with an unfocused beam, I suppose that the focused one could have perforated the whole finger, or at least, penetrate well to the bone.
Interestingly, the next finger (the one not shown) had a similar accident with a lathe. I lost just a tiiiiny bit of flesh on a knuckle, wich could have been muuuuuuch worse, believe me, lathe accidents almost always end in some form of amputation, if not death. Lesson learned. So, this laser one should work the same way, I hope. ^_^U