I’ve found there is quite a change going from brass to copper… I attribute it to copper being a great heat sink.
Do you know the laser source in your machine? Do you have a manual on it? Usually they will tell you at what frequency you get maximum power… I’ve found this nice to know. My JPT max power output is at 40kHz.
Yes, it was for copper, however it was such along time ago when I used it, I believe that I was never really happy with the result, but that was the best I could achieve.
I have a Raycus 30w from Cloudray, I did get a manual of sorts, unfortunately however it didn’t tell me what frequency for maximum power. With a Raycus there isn’t really that many frequencies to play with, I now wish I had saved up more pennies and bought a Mopa.