Hi there,
i am still struggeling with the quality of my cutting/engraving and can not find a perfect focus.
I bought the Laser cutter second hand and have not changed the tube yet. The Tube is 160 Watt - 1850mm long.
When i place a white painted sheet between the tube and the first mirror and fire once, the result looks like this:
I’ve never seen a 160Watt laser beam, but as a theoretical starting point and my experiences with much smaller tubes, I do not think it looks wrong. If it does not develop in 4 seperate points, then it should be good enough. How well can you focus after the 3rd mirror?