by edmond22 » Tue Aug 16, 2011 7:17 pm
Our Trotec lasers at work use a little tool you hang on the side of the laser head on a specially machine step and then raise the table till the bottom of the tool just touches the top of the material.
I plan on doing something similar on my machine, just need to find the correct tool length once the right focal length has been established.
You can also set it with a vernier just mesure 55mm from the lens to the top of the material so you would need to mark where the lens is situated