Just got one of these and was worried about the earth ground in manual. More and more machines are delivered with deadly configuration on the grounding of the electronics. But if there was life-threatening contact, the breaker should trip.. Links to vendors, forums, groups or web pages related to small C02 lasers. The ground from the 3 prong connection swings over to the bolt. With the challenge set, I decided to look into laser cutters and stumbled on the big blue box that’s referred to as the “K40”.. Overall this is a good machine but it leaves a lot to be desired and the quality control is certainly lacking. Didn’t quite understand where the grounding cable must go when inside the machine! There was paint on both sides and the bolt had plastic insulators on both sides of the case. I use two toothed/serrated washers closest to the metal. link to Don's K40 research and development;http://donsthings.blogspot.com/ 4: 4: CNC Zone Forum by Coherent Dec 4, 2015 5:20:41 GMT -7 In China, the electric standard is not well built and many houses still do not have ground solutions in their house. This project addresses one of the flaws of the stock K40 laser that I deem worthy of fixing. Also, I’m guessing my case ground post is not making good contact. Now, if the damage in part 1) happens, current will immediately flow to earth through the ground wire. BUR have realised its not earthed. New PSU, new tube. Loading... Unsubscribe from Caleb Kraft? Do I need to perform these steps but not use the ground from the post on the machine? À big compliment About Your website, very helpfull, thanks. I purchased my Chinese laser cutter with the underwhelming M2 Nano mainboard. Thus, an electrical fault CAN’T charge the case to a high voltage relative to ground, because the case is connected directly to ground. My first problem was deciding which laser to buy. Save k40 laser to get e-mail alerts and updates on your eBay Feed. Is this meant for US owners also? I am planning some serious upgrades to the unit I purchased and some fun projects. Feb 12, 2019 - Dedicated to the inexpensive K40 Chinese hobby CO2 laser that are the most affordable lasers to get us all started. The board interfaces with a front panel which is used to set the laser power from 0% to 99.9%, plus a ‘Test’ button which fires the laser: Below how it looks from inside t… The standard solution (in well-made equipment) is to prevent part 1 of the scenario. Now there’s high voltage between your hand and your feet, causing a current to flow through your heart. Should have been tested accordingly to the CE safety standard. Thanks for sharing the grounding information. the gantry is okey. Ground bolt on the K40 laser machine with external ground. Is this overkill??? The 40W eBay Chinese K40 Laser Cutter. Use abrasive paper or a knife to scrape away some paint around the hole for the ground bolt. Looking at a laser while working on your projects can cause permanent eye damage if the source isn’t … If it doesn´t, check the fuse in the rear power connector before continuing. Laser safety glasses / goggles for K40 laser cutter These Goggles have been specifically designed for use with Co2 laser engraving machines, including the k40 laser cutter. 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. If the beam is weak or just pulses for a half second, your tube or PSU might be out. Make sure your laser cutter is connected to your computer via a USB cable and Turn on your K40 Laser Cutter: Step 2. The problem is often the ground bolt in the back beeing isolated from the casing, this is where the ground from the wall outlet should have 100% contact with the metal. Class 4 lasers require a complete enclosure that prevents even accidentally reflected laser light from escaping the enclosure, and also requires safety interlocks to stop the laser firing if the enclosure is opened. There are a few ways to open the Windows Device Manager. Links. Some bolts has a plastic spacer, you might need this. How to troubleshoot no fire issue. In other words, the ground wire forces the case to the same electrical potential as the earth (and you) so that touching the case won’t shock you. One (bad) trick I was shown by my previous employer was, if you’re installing a new outlet and don’t want to go and find what breaker it’s on, touch the live to the ground and it will trip the breaker, therefore making it “safe” to switch out the outlet. Bad advice yes, but shows the live to ground tripping the breaker does in fact happen. Dustin Corbin 131,300 views. Fake CE markings, some call it “chinese export” and not the real Conformité Européenne, I have just installed a new K40 laser in my shed. Aligning the lasers on a K40 Laser Cutter This is one of the most time consuming parts and most frustrating when you first get the machine. 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. Both inside and outside. I see sense in your theory, but I’m pretty sure that the breaker gets blown once the live touches the ground (and short circuits). The K40 is a cheap laser engraver/cutter… C $55.95. The lock nut will ensure your bolt never comes off again. K40 LASER Cutter. But, the bolt itself are often isolated from the machine case which is a big problem, first off for your safety, second for the current regulations and laws about machines with high voltage. satisfying laser cutter action - and a problem with my k40 Caleb Kraft. Start with removing the ground bolt from your machine. The K40 style lasers all produce so much laser power that they’re in the most dangerous Class 4 category per the FDA’s rating scheme. The gantry works well and there is power to the sight dot which is not good. + Update your shipping location 7 S 0 P O N S O A R P A 7 E E D-1-1 U J-1 0 F J-1-1. 0: 0: No posts have been made on this board. Make sure your K40 turns on and homes to zero position. The white connector on the right is for the end stops (GND, YL, XL, GND and NC). These are links to the other tutorials I have made about important subjects of laser cutting. But focus on the grounding first, then look in to the problems. This guide has some tips and hints regarding the popular K40 laser machine type, but this can be used for any laser machine on the market as the science behind a laser mirror alignment is the same on all of them. This guide will help you identify and solve most problems with your laser machine not firing the laser beam. Think of a Concept. The K40 is a product made with parts to make a small and cheap laser machine. Check out Hawklaser spare & upgrade part store here. When I test fire there is a clicking sound and I think there is some blackening at the business end but no laser. Modded Smoothieware Chinese K40 Laser Cutter Overview - Duration: 33:26. I don’t like it for a few reasons; the first being it’s small. 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. The dark side – safety issues. … You do not need a cable on the outside of the machine if you have 3 prongs from your wall outlet. The case is now just sitting there with a high voltage relative to the earth, waiting for you to touch it. Build. The internal electronic parts are grounded to the ground bolt in the rear of the machine, so is the ground line in the cable you plug to your wall outlet. … If it´s overkill or not depends on your buildings ground status. Now mount the bolt in your machine again. This is a short warning with information how to solve the issue. In China they do this because the grounding is external and not inside the cable from their wall outlets. Remove ALL plastic/nylon washers from the ground bolt, only use metal washers. Remove all plastic shit and remove paint and ground the machine case properly and it works great, no matter if you use the ground rod or a good wall outlet ground. Start with removing the ground bolt from your machine. Now I have to find a way to tell my husband thAt I bought this machine…, Show him this website and he´ll probably be okay with it as a safe machine to use, and probably join you with the adventures making stuff with it . That problem is work holding. This is so helpful. Read the electric warning article i wrote a while back, in the FAQ menu. On my K40 I confirmed that the red external ground plug is connected to the house wiring’s ground, but the metal case is NOT. I followed your grounding instructions with the nasty blue wire supplied but still no luck. Ground wire goes to the ground bolt, and the bolt has contact with the metal case. 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? I have had a k40 for a few months but only just set it up. I positioned the cutter around 197x : 60y where it engraved just fine. 3) You touch the case. So, the point of this upgrade is to properly connect the metal case to earth ground. LINKS. Where should I not see water? botics. I have everything connected but noticed (by accident) that there is a slight electric shock coming from the casing. Thanks. 90% of the errors in laser machines are not skewed or non-square gantrys, it´s bad alignment of the three … My journey of the k40 Laser Cutter started when a friend of mine asked me if it was possible to create some cloakroom tags for his restaurant. I’ve had my 40W Laser Cutter for just over three months now and I feel that I’ve got a good grasp on how it operates. 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? The manufacturer connects the machine’s metal case to the earth via your house’s ground wire (the center prong on the three-prong plug). It is very dangerous with high voltages that can and will kill you if you aren´t cautious. Making Protective Face Visors with a K40 Laser Cutter by si Apr 7, 2020 10:07:37 GMT -7: Vendor Reports. That tells me the only contact between the case and ground bolt was the edge of the hole drilled into the case. part 2 of a troubleshooting series. This is much better solution. K40 Laser Cutter – the cheap Chinese hobby laser cutter. Most problems with the K40 laser cutter involves the power supply in one way or another. Read my article about Setting up your laser This is where the ground from the wall is bolted down, it has to be 100% good contact. I see a loop back to the grounding. Just make sure the metal is clean so the ground bolt has proper connection. The K40 is not, i repeat, not a plug-and-play laser machine. If not, you have bad grounding to your shed. How to identify and fix this problem. I have one of the larger Redsail x700 clones and my electrician installed an exterior earth ground when I had him wire a dedicated 20a circuit for the unit. You can also use loctite or two nuts. In a nutshell, the laser power supply that comes with a K40 laser cutter will push out roughly 30-35mA which will force more power through the tube than it is rated for. Introduction. Take a look in the article and follow the steps and it will probaly solve your issue. my laser engraver JK-1390, stopped burning while running This will disable the safety feature, some machines has a flow sensor on this, some is just bridged. 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. The sad result is that the gases inside the laser tube will start to degrade if you push too much power through the tube. It might be the cause of killing the tube for you. 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. 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. 40W K40 CO2 Laser Stamp Engraving Cutting Machine Laser Engraver Cutter USB ... K40 Laser Cutter Honeycomb Bed 320*220mm Co2 Laser 40W Engraver Machine Parts. Start with following the guide above, you need to make sure you have it grounded. ... a K40 laser cutter project - Duration: 2:49. Share your good, bad or deadbeat vendor experiences here. eBay and Alibaba are riddled with auctions from sellers with different versions of the K40. Not needed if you have proper ground in your wall outlet! 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