Hi, we run a Shenhui 1280 and just changed from old 100W RECI to 100W EFR, along with changing all the mirrors. We also removed the collimator lens for the inline red dot as it often didn't work well anyway. The combination of new tube mirrors, alignment has given a nice increase in cutting performance, but we have a problem.
As per picture, on the right side of cuts we notice a little burning as though the kerf width is wider or the beam distorted.
Air supply is as previously (2 bar for wood) through cone extension to 10mm from the surface of the cut. Most of the smoke from the underside where there is no problem, and the direction of the burning is at a right angle to the direction of extraction.
Happens with various lenses, but this picture shows a new 75mm lens.
We have tried altering the focal distance. We have made sure that the beam is coming through the centre of the cone as we suspected reflections. The beam is hitting the centre of the mirrors and cuts are good, straight and clean.
Having considered the above points, I'm asking for other ideas.
Thanks!
laser cut sample 1.jpg