@ntambomvu, ah, possibly two new threads would eventually make sense. Let me clarify.
I originally was suggesting that you start a new thread now for diagnosing your weak cutting action. Even if the current problem is a bad tube, if it’s bad because of some other problem on the machine you’d like to know that before putting a second tube in place.
We want to be able to help people fix machines, but we also want to make the conversation help the next person with a similar problem find the answer. That’s why I suggested a separate thread for diagnosing the problem with weak cutting. A “Please help me confirm my diagnosis of a bad tube in my K40” topic will be something someone else can easily find, read, and learn from.
You don’t need to create a new thread for this. I was just saying that a thread that started in the middle with @bernd_dk responding to you made me realize I hadn’t been clear about the point of a new thread — It was to put your question first, and then the answer, into a place where it would be easier for the next person to find. Fortunately discourse makes it easy for me to fix the confusion I created.
Beyond that, also, in #k40:mods creating a thread documenting all your mods would be great! Either one thread with all your mods, or one thread per mod, or something in between. Feel free to write about them as you go along — I have several build logs. I did the “one long post” version for a few 3D printers, and right now I’m building a large-format laser and I’m trying to do one post per major topic for it.
But for now, let’s just keep going here.
Here’s something important to understand: What you can see in the tube is not the laser beam. It’s plasma, like in a florescent light bulb, that excites the laser beam, and it goes between a cathode and an anode that are next to but not part of the mirrors at either end of the tube, so at the ends that plasma basically has to bend. The laser beam itself is completely invisible. The wavelengths of the infrared laser are more 10 times longer than the human eye can see. It’s primarily 10,400 nm, with some at 9,400 nm. We can see light in the range of about 400 to 700 nm. This is related to the laser being dangerous. You can’t see anything about the laser except the effect it has.
Are you aware of how laser tube high voltage wiring is different from normal wiring?
The thing that matters most is that the X and Y axes are square to each other. Are they now?