My primo is mounted on a piece of plywood, sitting on a wooden bench. It also has three layers of 3/4 and 1/2 inch MDF for the work surface/spoilboard. I have a 400x400 sculpfun honeycomb laser table that I set in the middle of the work area for laser projects. Last night, I set up a grayscale test on a piece of tile (Norton white tile method), and left the garage for a while. I have a camera, but hadn’t checked it in a while. Was on the computer in the house for half an hour or so.
When I came back out, I found the garage was full of smoke! After burning the grayscale test, the 10w laser had parked itself at its home point, over the wood spoilboard, at 100% power, and started burning its way through the wood, aided by the air assist. I’m very lucky that it did not actually catch fire, which it easily could have and probably would have eventually. As it is, it burned a hole an inch around and 1.5 inches deep.
So my question is: what are some things that could be done to help prevent this from happening again, or mitigate the risk if it does? Yes I know - don’t leave the laser unattended. But what else? Is there some sort of timeout code or something I could add? Something that could kill power when the program ends, or if the laser stays in one place for too long? Is there some material I could put at the origin point that could withstand the energy from the laser without becoming dangerous itself (like red hot)?
Thanks for any advice!