"PCB" Substrates and Laz0rs...

Comments

• Phil Pilgrim (PhiPi) Posts: 23,514

  2018-11-26 21:25

  I think acetal copolymer (similar to Delrin, an acetal homopolymer, and more expensive) is less staticky, and it lasers very cleanly.
  
  -Phil
• WBA Consulting Posts: 2,933

  2018-11-27 01:25

  ESD acrylics are readily available, but expensive. McMaster carries a few options. Also, Techspray Licron spray can be used to create a static dissipative coating on plastics as well, although not cheap, it does go a long way. As Phil mentioned, Delrin lasers very nice, it is my favorite laserable material.
  
  Nice work with your invisible PCB. I have made a few the same way using ESD acrylic and one using kapton film. I have one ready to cut that is a design where 36AWG wire becomes the traces on the board so it will truly look like an invisible PCB. Been on the back burner for a while....
• __red__ Posts: 470

  2018-11-27 05:13

  As if the universe was trying to tell me something, while las0ring the console case for my P2 mini-computer I managed to set my laser on fire and (it looks like) fully destroy it.
  
  I managed to contain and extinguish the fire so my house didn't burn down. I'll consider that a win.
  
  Tomorrow I'll strip it down and evaluate the damage - the optics are fully toast for sure.
  
  So - thanks for the advice guys - may be a few months before I can try those new materials out
  
  
  Red
  
• WBA Consulting Posts: 2,933

  2018-11-27 18:02

  Wow, sad to hear that. Was hoping to see some progress on your ideas since I haven't been able to do much with my own.
• __red__ Posts: 470

  2018-11-27 21:42

  So I've done some initial recon as to the damage and it may not be as bad as I originally thought.
  
  It looks like the motion control is still good, the laser & electronics are still fine.
  
  The air-assist is dead (a molten puddle on the floor).
  The optics are degraded badly. I expect they'll crack in a few minutes of use as the coating looks permanently damaged.
  
  The main loss is the top of the case as the plastic "window" that you can see inside with got so much heat that the surface has bubbled and has sunk down. I'm not risking my eyes with that so until I get that replaced - I'm not working on anything else.
  
  I guess I could look at it as an excuse to upgrade the optics to include a beam combiner and a head that has a movable lens.
  
  If I have to replace all the mirrors and lenses, I may as well go for the better quality / larger optics - not to get the extra ~2% performance but for ease of keeping collimated.
  
  (Plus - I just ordered a 950GPH air pump - this isn't going to happen again...)
  
  
  As for the P2 Console project - it doesn't *stop* me, it just won't be so pretty :-/
  
  I'll put it on proto-board and worry about lasering a front-panel for it again later.
• Phil Pilgrim (PhiPi) Posts: 23,514

  2018-11-27 22:50

  Wow, bummer about the laser! What kind is it? How did it happen? Did it stall with the beam on?
  
  -Phil
• W9GFO Posts: 4,010

  2018-11-28 00:02 edited 2018-11-28 00:06

  Try acetone on the optics, you can even use a q-tip to "scrub" them. If it works you can use them while you wait for replacements, then keep them as spares.
  
  Literally any pair of glasses will stop the beam from a CO₂ laser. No need to get special "laser" glasses. Note that for other types of lasers it is important to get the right safety glasses - just not for CO₂ lasers. I probably run my machine with the lid open about half the time - and I can still see pretty good with one eye.
  
  Size of mirrors has nothing to do with ease of, or maintaining alignment. The quality of the mount and the method of adjustment may though.
  
  The number one reason for laser fires is leaving the machine unattended. I never leave the machine while running. Treat them like they are going to burn your house down the moment you turn your back on them.
• __red__ Posts: 470

  2018-11-28 03:43

  
  
  I guess I'm doing it old-sk00l :-)

  

  

  IMG_20181127_223448325.jpg

  4160 x 3120 - 4M

  IMG_20181127_223448325.jpg 4.4M