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Registered Member #546
Joined: Fri Feb 23 2007, 11:43PM
Location: Albuquerque, NM
Posts: 239
So... I don't have any pics worth taking, so no post today... as soon as i get to the dichro etching step I'll post.
today i spent researching resist materials. pertty much anything that will adhere to the glass will work. I tried:
Sharpie pen - worked CA glue - worked Elmers (PVA) glue - worked scotch tape / PSA vinyl - worked acrylic paint - worked melted wax - worked (bees, parafin) Screenprinting / fabric ink - worked
things that did NOT work:
China marker grease pencil wax crayon or any wax not melted to the glass gum arabic #1 litho crayon
things I've yet to try:
Imagon film ulano Diazo emulsion india ink toner (fused) oil paint
- I'm mostly interested in screenprinting these, or some form of positive working UV resist film, so I think I have what I need.
I ran my tests on 6" sheets of clear glass, (Bullseye Tekta 10mm clear) and while I can see the etch, it's VERY hard to photograph, and my scanner doesn't pick it up either.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
Looks like I am a little too late, but I would like to add that the laser to etch that stuff actually wouldn't be all that expensive A simply ssy-1 laser off ebay (~$100) and a little PFN (~$50) and you would be able to etch anything that absorbs 1064nm. Since it is q-switched you get incredibly high peak powers (several megawatts) which can ablate just about anything, and it loves to eat optical coatings.
I think this would have been a perfect job for the cnc obliterator
Or, not having the stages laying around you could create temporary masks by printing on a OH transparency, and using that as a mask. You might have to but the toner side up (as it will explode when you fire at it), but since you are using a nice colminated beam from the laser it wouldn't really matter.
hehe, take your pick, you can play with nasty chemicals or bigass lasers
[on topic] As to taking pics of it, can't you just take a pic of the shadow cast by in (in sunlight)?
Registered Member #546
Joined: Fri Feb 23 2007, 11:43PM
Location: Albuquerque, NM
Posts: 239
mmm the shadow yes, good point.
Also, I'm in the process of making a CO2 laser - it's a long term project. one thing I had in mind was making a nice little xy table to burn dichro... but it's a ways off. I still have to make my tube and get it evacuated and filled (something I'm capable of doing, but too lazy to get around to it)
Still.... this printing and etching is fun :)
I coated a glass sheet today with photo emulsion, but it took too long to dry and had to leave the shop. I'll see if I can work on it tomarrow.
.... I think I'll wind up screening resist on. The film is higer res but not as cheap.
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How can I etch dichroic glass?
A simply ssy-1 laser off ebay (~$100) and a little PFN (~$50) and you would be able to etch anything that absorbs 1064nm. Since it is q-switched you get incredibly high peak powers (several megawatts) which can ablate just about anything, and it loves to eat optical coatings.