Hey Don, I put it up to 5mA and with a pieces of paper over mirror one and can confirm that the piece of paper was unharmed.
I moved the paper to the exit of the tube and still the paper survived,
Hold the paper at the tube I turned down the power and when it go to 3mA the paper got hit by the laser
Yup! The visible plasma isn’t the laser, it’s how energy is pumped into the (entirely invisible, far-infrared) laser beam. The anode and cathode are rings at the ends, so the electrically-driven plasma will naturally have to curve a bit to reach them.
It might be useful to turn out the lights and open the control panel and laser tube covers from a distance look and listen for crackling or arching around the tube or the LPS.
Hey Don, yeah no crackling that I can hear. everything sounds normal when it is running but I will see if I can see any arcs (my machine is grounded too if that makes any difference).
I have also ordered some new tubes today just in case
So I really have no idea what part of my laser is failing, so far I have ordered new mirrors, lens, air assist, & tubes but guess I might as well order a new power supply as it could also be that.
Is there any particular power supply that I should look at?
if your tube was not outputting any power above 3mA of current(at tube output) and you replaced the tube to no effect, checked the wires from the tube back to the LPS for arching then it’s likely the LPS. Air assist, mirrors and lens have no effect on this since nothing is exiting the laser tube. seems like an odd failure and I too would have guessed wire arching at high voltage with higher current.
Need a picture of your supply so you can pick a new one the will not require rewiring.
It is either your tube or your LPS it is often hard to be sure of which one. You said you ordered a tube so I figured you would install that and see if the problem was fixed. Then if not the LPS would be next.
You arent wasting your money in any regard because both these parts will eventually fail.