by bdring » Sun Apr 03, 2011 2:10 pm
If you get the beam through the nozzle in some positions, but not others, that usually indicates a less than perfect alignment.
Make sure you are in the center so slight variations will not cause it to hit the sides. If you hit slightly, the reflecting beam might show up as bad cut quality.
Make sure the final mirror (in lens holder) is not rotated slightly. This will cause the beam to go down at an angle. This happened to me once and it took a long time to figure out. I was getting angled cuts.
Consider drilling out the nozzle. I made the hole as small as I though anybody would ever want with the idea that people would drill to suit their requirement. While everything was fine, I drilled mine about 25% over as an experiment to see how it affected flow. I didn't notice much difference, but left it anyway.
Bart
"If you didn't build it, you will never own it."