Hi please could somebody advise a newbie?
I bought a 2nd hand K40, they said not used much.
It test fired but only burned paper at 12%, higher powers no burning.
Changed flyback, added ammeter.
Now get pink glow on test fire but will not burn or scorch paper throughout the power range below.
Hi Don, many thanks for responding. I am holding paper directly in front of the end of the laser tube so there is definitely not much light coming out.
There is no dot on the paper, no mark whatsoever.
I’ve tried cleaning the output laser mirror, seems clean enough.
I am using deionised water.
There are no signs of any cracks.
When I attached the HV lead from the flyback I used one of the connectors from inside a small terminal strip as below, (filed down screw to fit inside silicone tube and then siliconed).
When I tightened the screw I am not sure if I heard a faint crunch. I thought it would probably be all right as it may just be very thin layer of glass that tapers down to nothing around the HV terminal.
Absolutely no signs of cracks around the HV terminal as far as i can see without taking the silicone off.
If there were any leaks surely the tube would not make the pink slightly violet glow in the tube?
I have had the same issue recently. Mine was working fine then the next job - trying to cut a stencil from card stock - failed. I tried 6 passes at 10mm/second and couldn’t burn through. I though something happened to my mirrors so I put paper on them to check alignment and hit the test fire button. There wasn’t even a mark on the paper on the first mirror. The laser tube was glowing pink when fired. Eventually, I just pressed the test fire button and held it. After a couple seconds a large 1/4" double mark (two half moon shaped marks) started to burn into the paper. I assumed the tube was going bad so I ordered another one. I believe somebody recently had a similar post on here somewhere about it, but for the life of me I could not find it.
@donkjr I’m trying to figure out where in the Getting Started category to put information on TEM01 — it’s certainly come up recently but isn’t in the intro docs. Ideas?