Is only a test with diode laser

But a glass bottle painted with NWT method and engraved at 500mms 85%power with my DIY brand new rotary is a success


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Nicely done!

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Can you do that without the paint?

I thought it’s the titanium oxide in the paint that changes to black on tile.
All of mine have black results.

This looks like you did the glass fine, that’s why the question.

:smiley_cat:

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no without paint laser beam passes thru glass, and is exactly what happens, titanium oxide change to black on tiles, i got a try with a paint without TO and the result was… nothing, once cleaned the tile has turned to white as i never engraved it.

I suspect it’s the wavelength of your laser. Maybe heating up the glass via a coating is giving you that finish.

Things sure change with a different frequency.

:smiley_cat:

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my diode is 450nm and i think you are right TO heat glass and engrave it, and CO2 lasers do the same whitout paint cause has wavelength of 10,600 nm and btw CO2 means Carbon Dioxide so… is quite the same component that we find in paint and that’s why we use paint with Titanium Oxide :wink: