K40 Laser Tube & Mirror Alignment
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- เผยแพร่เมื่อ 11 ส.ค. 2021
- A Roger Webb easy learning K40 Laser tutorial Video 585 K40 Laser Tube & Mirror Alignment The Australian Inventors Workshop™ 2021
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I got a *new to me* no name K40 last week. The person who gave it to me claimed it was new to him and he never used it (claimed to purchase off of ALiExpress). It seems to have been used: mirrors filthy, lens cloudy, top lens way dirty ...)
I found the machine in decent working order once I watched some videos. I ran some test files for engraving and cutting with the stock mirrors after aligning and it engraved great, but would only cut 1.5 mm basswood with 4-6 passes. From what I've seen, it should cut that with no problem in 1 pass.
I received and changed out the mirrors and lens this AM, man what a difference in the shiny factor. I had to retweak the alignment, and ran some test fires and cuts for a focus test. When the head is closer to the left side, focus is thicker and as it moves right focus gets sharper then thicker again. Running around 12-15 mA.
Since I'm not getting the cut I expect, what should I focus on next to get it to cut? I've moved the wood even with the clamp, slightly below the bed, above the bed....all the same.
Where might my power loss be? More alignment?
I have ordered a k40 and i have not got it yet, but i have watched heaps of videos before i hit the buy button, but now having watched this video i want to thank you in advance, you have definatly helped me more in understanding some things that were not addressed in the other videos i watched, thanks mate
I found a very similar problem with mine. There's 2 short bolts underneath that hold the brackets that the laser tube rests on that the clamps are screwed into. Well they were loose and I had the same issue trying to line up the mirrors until I found those 2 bolts loose. I didn't think about measuring the back panel for parallelism, that would have saved me 15 minutes or so. Thanks for the great video Roger, keep lasering away! 😊😊😊
P.S. By the sounds of it we need to have big signs made and sent to these Chinese factories for the assembler at the area they install them - "DON'T FORGET TO TIGHTEN THE BOLTS KNUCKLEHEAD😳😳!!" 😅😂🤣
I got mine with a missing laser clamp bolt, but I am slowly getting through some changes and trying to set it up right first time, a great exhaust system ducted out of the area. Looking forward to starting it up.
Thanks Roger! I never even thought about that as the issue for myself as well.
I’m watching all the k40 series. Thank you for sharing 👍🏻
Glad you like them!
@@rogerwebb9600 my pleasure 👍🏻
Thank you for this presentation about the alignment of laser CO2 tubes, I think the alignment technique of any laser uses a HeNe laser or diode laser in the range of visible region then we can adjust the CO2 laser power using the cavity mirrors.
Thanks! I just sold my large, inop laser to a friend and bought his K40 setup. Looking forward to the next vid. :)
Hi Mike
@@rogerwebb9600 Hi Roger!
Super great videos about the K40. They help me very much. Thank you very much and best regards from Germany.
Glad to help!
Thanks this was a big help
That’s great information thank you so much
You are so welcome
thank you very much
thanks roger and say hello to Tasmania for me
I followed your instructions and found my laser tube was perfectly parallel with the wall but the gantry and work bed were not. I think in shipment (it came damaged slightly) it knocked the frame of kilter enough to offset the gantry. Now, how to make the gantry parallel is another question I will have to experiment with
You made that look real easy.....Thank you
You’re welcome 😊
I may be wrong about your first mirror, mine is adjustable so the laser tube doesn’t need to be parallel to anything, the first mirror reflects the beam in any direction you want, in this case parallel to the y axis. If the first mirror is aligned then any movement of the gantry down the y axis will keep the beam on the same spot on the second mirror.
Technically, that can work, but your going to have a much harder time lining that up then if the beam is traveling square to everything. The issue is, that the physical position of the receiving mirror attached to the moving gantry chances left or right to the position of the beam coming off mirror 1, as the gantry moves further away. So even if you lined up perfectly on mirror 2 when its right up at its closest, when it moves to the furthest position, the mirror itself has moved a mm or two off centerline, if you adjust mirror 1 to then point at 2 and get it centered again, when you return the gantry to its closest position, its now off the same mm or two, because the 2nd mirror is moving diagonally to square of mirror 1, you can find that perfect spot where your beam is also diagonal and aligns to the same diagonal of the gantry. it is possible, but it is much, much, much harder to do than when things are aligned. and these things are built so poorly that just the tube and gantry alignment is the tip of the iceberg, on mine the height of the entire gantry assembly also changed from front to back, so in addition to the tube being out of alignment to the gantry, my gantry frame dropped as it went from the back to the front of the machine. so my laser dot moved down and left as the 2nd mirror moved to the front, so much so that it was dead center when it was at its closest and completely off the mirror when it moved to the front, in 2 directions. I had to shim up the gantry frame to fix the drop as well as align the tube to the gantry. it was a nightmare to get working right.
@@53rdcards You really have to review how you adjust you mirrors. The first mirror is fixed relative to the tube. The tube can be positioned anywhere as long as the mirror reflects the beam in the right direction, it appears as an image of the tube. There’s no special requirement that it can only reflect at 90 degrees.
Adjust mirror 1 first. Make sure you hit the same spot over the full travel range of the Y axis. Don’t adjust mirror 1 to fix misalignment of mirror 2, you’ll never finish.
My gantry is a very slight parallelogram (not a perfect rectangle) and, when aligned, the beam hits mirror 3 in the same spot anywhere it can move. It draws a slight parallelogram when I ask for a rectangle but the mirrors stay aligned.
I replaced my mirrors after seeing the blemishes on the original parts and the new mirrors required me to raise the tube, I know your pain. If it wasn’t for K40 whisperer I would have changed the electronics too. I cut the bottom out of the case and saw how poorly the cutting bed was installed, the posts weren’t even the same length and didn’t align with the bed. The burring on cut edges, the metal cuttings, the stripped threads, the electrical interference and much more make for a lot of pain if you want a decent reliable machine.
Roger, thank you for your excellent video. I have yet to find anywhere that states the amount of distance from the laser tube to mirror number one.?
15mm to 50mm Laser yube end to mirror (1)
@@rogerwebb9600 Thank you very much! I love all of your videos! You show your intelligence in any instance you encounter. It is definitely worth listening to all of your logical, scientific information that you provide. It truly is a pleasure to watch!
Hi I replace the tube but it does not work, when I press the button to fire I feel the current what happens
What if head and sheet isnt same dimmension :(?
Hi I been watching your vids they are very very good have you a email I can contact you on ?
Patron!