Wonder if anyone knows what material doesn’t reflect co2 laser light? I need something to put in the bottom of my laser that doesn’t burn and will not reflect laser light back up at the underside of parts being cut.
Cement sheeting,what bed are you using?
All metals will refect the laser beam,how far from metal is your cutting material.what pressure air assist are you using?
Cement sounds good. I’m using my own bed design. It’s mostly open so I want to put something in the bottom of the machine.
Can you add a photo of your bed and tell me how far it is away from metal below it?
You can see in the first picture the hole in the bottom of the machine. I covered all the holes with aluminum duct tape but of course that reflects a lot of the light. I think I will try 1/4" cement board in the bottom. Also may try some in the frame too.
I think anodize Al absorbs not reflects CO2 wavelength.
Just thinking more about it and thought I saw someone use ceramic tile upside-down. I have some around that I could try.
@ALFAHOBBIES water is a good absorb-er @ CO2 wavelengths :).
You can reduce/diffusion reflection from a metal plate by roughing it up hard with like 80 grit sandpaper. The resulting grooves increase absorption and what does get reflected is greatly dispersed.
the hole at the bottom is an air input, needed if you want a good air circulation & exhaust.
also handy for cleaning the ashes and bits away.
The hole also let’s the laser light burn anything that sits under it. I just let more air in the front. Almost set a box of plywood on fire because of that hole.
I put an aluminum oven tray liner under mine to protect the table top.