I bought K40 from Aliexpress about a few months ago. I had problems with mirror alignment and finally, I was able to align them well enough.
This is my first laser so I didn’t have enough knowledge of how to use it
- I plugged it in not grounded socket.
- Use water from a tap.
- Few times tried cutting with ~80% power
- Every time if I tried to go over 50% power it started screaming… I didn’t know that it was not good… I thought it was supposed to sound like that.
- Every time I started cutting and touched the water it electrocuted me, but I thought it was normal for a Chinese laser.
The engraving was fine from the beginning, but with cutting, I always had a problem. Sometimes it cut at 25% with one pass, but mostly I used 45% power, and two passed so the small cut part would fall out by itself.
A friend said it was not normal, and it should cut 3mm of plywood with one pass.
Finally got my first bigger order, so I cut for few days 10 hours a day. Last night it started to cut not ass deep, and this morning I noticed that the cutting line became much wider. I tried cleaning mirrors, adjusting the focus point, but nothing helped, and finally, I noticed that laser beam in the tube arcing.
I google that can it be, and found that I need to use distilled water, so I changed tap water to distilled, I installed a new grounded socket, I grounded the laser itself. The laser became like a new machine, no extra noises, I could touch the water when it’s cutting, didn’t get electrocuted…
But it didn’t help with arcing… So PLEASE can you gays help me out to figure out if it’s possible to fix this machine o do I need to change the tube or PSU…