So I got a new laser head thanks to Mr Beam Support a little while ago. I didn't have the to when I got it and it took a while but now I did a focus test finally. I did it as it is discribed in the "Lasercutting" book. Lasered on cardboar which is on the bottom on one and and the other end was raised for about 15mm.
By testing several times I now know that my Focus is at 19 to 20mm distance to my material... That's double the distance it should be... I think this also reduces the maximum height of the working area because I can't raise the laser enough.
Does anyone know if you can somehow adjust the focus point or something. Some help would be really awesome. Thanks guys!