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Make sure your laser cutter is connected to your computer via a USB cable and Turn on your K40 Laser Cutter: Step 2. Didn’t quite understand where the grounding cable must go when inside the machine! It is very dangerous with high voltages that can and will kill you if you aren´t cautious. … Save k40 laser to get e-mail alerts and updates on your eBay Feed. 4: 4: CNC Zone Forum by Coherent Dec 4, 2015 5:20:41 GMT -7 My house was built in 2003 in USA so it has all grounded outlets. Should have been tested accordingly to the CE safety standard. House is grounded. But if I read this right, you do NOT need to run a wire to an external earth ground if you have a three-prong outlet, like we have here in the US, correct? After that you can start by checking out the “no fire troubleshooting” guide to find out more what your machine can have trouble with. So the machines are built by their standard, when we in EU or US or other parts of the world often have a good ground setup already in our homes since many years. I use two toothed/serrated washers closest to the metal. If the beam is weak or just pulses for a half second, your tube or PSU might be out. Not needed if you have proper ground in your wall outlet! Also, I’m guessing my case ground post is not making good contact. These are links to the other tutorials I have made about important subjects of laser cutting. … Loading... Unsubscribe from Caleb Kraft? ... a K40 laser cutter project - Duration: 2:49. LEDs for 220volts, a lot of them can be simply touched on the 220v parts. 90% of the errors in laser machines are not skewed or non-square gantrys, it´s bad alignment of the three … I have had a k40 for a few months but only just set it up. This guide expect that your ground wiring where you have the laser is up to code. But if there was life-threatening contact, the breaker should trip.. Thanks for sharing the grounding information. More and more machines are delivered with deadly configuration on the grounding of the electronics. There is a stiff copper wire that enters the basement through the exterior wall and I run a wire from the ground terminal on the back of the machine to the connector on the external earth ground. The K40 is not, i repeat, not a plug-and-play laser machine. Think of a Concept. So, the point of this upgrade is to properly connect the metal case to earth ground. It does not work. This is much better solution. I suppose if there wasn’t good contact with the live wire and the case, it may not trip the breaker. Welcome to the ultimate K40 mirror alignment guide for your k40 laser cutter machine. It drove me absolutely bonkers when I first got my machine, and I’d guess that 90% of your problems will be caused by misaligned mirrors. Most cheap chinese laser cutters have the ‘M2 Nano’ board installed, same for my machine: The above M2-Nano board picture shows on the bottom the two stepper motor cables plus the connection to the laser power supply (blue: LO (Laser Out), 5V, GND and 24V input. Start with removing the ground bolt from your machine. Definitely want to be safe using this thing. Ground wire goes to the ground bolt, and the bolt has contact with the metal case. 2) You’re standing on the earth, so your feet are somewhat connected to the earth. 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Use abrasive paper or a knife to scrape away some paint around the hole for the ground bolt. the gantry is okey. k40 laser cutter issue with outline function. my laser engraver JK-1390, stopped burning while running Out of the box the K40 is a perfect tool to destroy your eyesight, kill you by an electric hock and burn down your house. Modded Smoothieware Chinese K40 Laser Cutter Overview - Duration: 33:26. WayofWood 4,132 views. If you have just bought a new K40 laser cutter or have replaced your mirrors, chances are that you are going to need to align your mirrors Although this demonstration is using a 50W ebay Chinese laser cutter, the principles are the same if you Which wood can the K40 cut? I was wondering why it would need additionally grounding. Looking at a laser while working on your projects can cause permanent eye damage if the source isn’t … The 40W eBay Chinese K40 Laser Cutter. Is this meant for US owners also? Overall this is a good machine but it leaves a lot to be desired and the quality control is certainly lacking. This project addresses one of the flaws of the stock K40 laser that I deem worthy of fixing. There was paint on both sides and the bolt had plastic insulators on both sides of the case. Making Protective Face Visors with a K40 Laser Cutter by si Apr 7, 2020 10:07:37 GMT -7: Vendor Reports. Bad advice yes, but shows the live to ground tripping the breaker does in fact happen. From my research, I found that the reason for grounding is that if a high voltage wire were to come in contact with the case, and it was grounded correctly, there would be a surge of current from the live wire, to the ground, which would trip the breaker. eBay and Alibaba are riddled with auctions from sellers with different versions of the K40. People are getting confused because it reads like if you live in the US or UK you don’t need to use the rear ground bolt. 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