Setting Laser Focus on Your K40 Laser 

I have had my k40 for 6 months and read article after article about focusing. This explained it perfect in 6 minutes instead of pages and articles and blogs about it. No fluff and no BS.....thanks!

I have probably watched 10 different guy show 10 different ways to do this. but your way is by far the best way I have seen yet. thank you so much for sharing your idea.

4 year old video and still relevant! You just saved me from hours of trying to figure out why my K40 wouldn't cut through 1/8" light plywood! Once I found the height difference I designed and 3D printed holders to hold the ply at the correct height and it started ripping through in one pass! ++ for you sir!

Thanks! Equally impressed that this is 5 months old and no dislike trolls :)

You’re so clear in your videos. I heard a mess of a ramp test before this video. Thank you for your clear concise videos.

Just what I needed, got myself a K40 yesterday and finishing getting set up, all good to go now, thanks buddy

WOW....first video I saw of yours, subscribed halfway through. Absolutely perfectly edited and clearly explained to be the perfect balance of concise and informative. And it may save me from tossing my K40 out a window! ThankyoU!

please keep the videos coming...best explanations out there for us newbies. thank you for taking the time:)

Very clever thinking, I will be using this method as it's a manual adjustment & virtually foolproof.😃

Awesome job thank you, you explain things so well 😊 your the only one Ive found so far that makes sense and using the same software as the rest of us. Once again thank you top video.

Thank you very much. I was having trouble adjusting the laser focus distance

thank you. this video was easy to follow and will help me out. Im new to laser engraving and only got my laser last Friday (19.02.21) and am having so much fun so far. all you videos have been great thank you

Hi thanks for very informative videos. A quick tip to resize page to drawing is Control, Shift R. Keep up the good work.

Realy trivial, yet genius :D thanks a lot!

Amazing thankyou! Everyone kept telling me to do a ramp test but I had no vlue what it was.

How does this guys only have 118 subs? Every vid is to the point and great tips. Keep it up...new sub.

cheers man, ive been struggling to even draw a line on inkscape, super helpful.

So glad I found you! I have a 100W Omtech but my son brought me home a k40 just like yours! it's been used but looks in great condition. The water tubing is yucky though and I want to replace it before I even try to power it up. What do you suggest for tubing? I only have farm supply stores in my area and I doubt they have this kind...would regular tubing work? Thank you for your easy to follow vids!

A round bubble level on the surface of the bench/lab jack might be worth an idea too. Will give you a level at all axis' that way.

Awesome, great instructions and very clearly explained. Thank you

nice and simple, thank you for that

Great stuff, thanks for that Travis, I learned a lot about Inkscape and scroll sawing from you a few years back, glad to see you with the K40 and look forward to more videos from you.

simple but brill thanks

Excellent! Thanks for your help!

Good Job man. Ciao from Italy.

Very good, thank you for sharing

Curious to know how much the focal length you found defers from the manufacturer’s recommended focal length? Thanks for sharing this tip.

Very good videos, Keep up the good work. I see many subscribers in your future

awesome informative videos! Thank you

Great Video! After upgrading to air-assist nozzle and 18 MM lens, I was having an issue the laser firing a 4mm curved line. I am going to try your suggestion. What did you use to label the plane. I heard you mentioning turning a knob. Thank you!

You ran this ramp test at 20 mm/s which is a sort o CUTTING speed. IF you run the same test at ENGRAVING speed 200 to 300mm/s you will find you have a different focus. The ramp test is not finding the fixed OPTICAL focus set by the lens manufacturere but an INTENSITY focus that will change with speed, power and material. Check it out for yourself.

Very helpful.Thank you for the video.

Hello there.. This is a good idea, since you don't have to insert a wedge dial to measure the distance between the material and the nozzle where the laser comes out, which may damage the rail carriage bearing repeatedly. But one thing i noticed when cleaning the lens and then reinstalling the nozzle head; the focus may change a lot just by lowering or raising the nozzle body with respect to # 3 mirror (Gantry mirror). So you have to readjust everything one more time and then do a ramp test and get the focus right.

I really like your drag chain, is there a printable version somewhere?

Thanks for the Video.I just subbed to you.

What's your settings (mm/s and power) in 4mm plywood or even 3mm acrylic ?

Where does one get this scissor jack? K40 beginner here lol I'm used a large laser that has the movable bed.

I read that, the focal point should be set to the middle of material's thickness. So what is the correct setting? The focal point what I get with ramp test should be on the surface like in your video or I have to set it to the middle of material"s thickness?

Can't you just cut a piece of wood/acrylic that is the distance from the laser head to the material? And then just put that on top of whatever you're cutting and raise the bed until it hits?

Very well explained. One question, I cut balsawood sheets for model airplanes, what table do you recomend to use for cutting balsa? I see you have a solid table but this wouldn't be a good idea for cutting. Any SIMPLE suggestions? Thanks EDUARDP

Hi sir I want to clean my lazer tube for k 40 co2 you can say me what to do ?

Thank you for this video !! i found this wrong.. if you want engrave something is perfect but for cutting its wrong i think .. if you have a 3 mm wood lets say the right focus on top is 50.8. this means you have 50.8+1.5 ( the half thickness of the wood) then the focus in middle is 52.3. allright lets say now you have a 6mm wood and you want to cut it. The focus must be in the center, then you have 50.8 on top like your measurement but in middle 50.8+3=53.8. you are 3mm wrong !! i use to cut 3mm wood 49.3mm from/to top and 6mm wood 47.8mm focus distance!! Am i right ? ( sorry for my English its like Greek to me :P )

now is there any different steps when say setting focal distance for cutting vs engraving? i usually work with .187" material , and going to engrave and cut some .5" material now . i can understand adjusting focal for the thicker material , but as far as cutting goes , would it be better to set focal for platform height ? or top surface of material ?

How do you measure the amount of distance between the material and the laser what is it inches millimeters?

I wish you were my neighbour

You are not cutting the wood (ramp) you are just engraving? What about cutting