LightBurn Galvo Lens Correction Guide

[@paraglidingprospector]

Thanks so much for posting this! For those of you stuck on the scaling math at around 9:20, since the release of this video, Lightburn has updated the interface for the device settings to now include a quick fix! Look for the three small dots (…) inside a small square-shaped ‘button’, which is just to the right of the “Scale” sections for the Galvo 1 and Galvo 2 settings areas. Click on the three dots / button and you will see a new window asking you to enter the “Requested size” and the “Measured Size”. For the example in this video, the requested size is 65mm. Note, my Galvo 2 is my X-axis (left to right/bottom line) so be sure you’re measuring the correct X and Y axis when entering your settings. Hope this helps folks! Thanks again for posting all of these great tutorial videos too! 🙌🏼

[@lexispapi]

You are a life saver thank you. I could put in the decimals and have it do more precise math than I would have liked. You’re the best!

[@paraglidingprospector]

@@lexispapi Yep! Glad someone found this tip helpful. (In addition to the video too of course!) 🤙🏼

[@chrisb9841]

Such a perfect tutorial! I just did my (new) lens correction and there was no doubt for what to do in any step! GREAT THANK YOU!

[@lightburnsoftware7189]

Glad to hear this helped get your new lens dialed in.

[@steinbierz]

Great video…is this applicable to all types of galvos (UV, Fiber, CO2)?

[@47zero]

Thanks so much, I was dreading trying to figure out even where I was going to find information on these steps. 💯

[@krisknowlton5935]

Is it possible to transfer all those settings to another computer or do you have to do it manually?

[@rileycrain5784]

Do you have to do this for every lens?

[@lightburnsoftware7189]

@@rileycrain5784 - if you want them to be accurate, yes.

[@rileycrain5784]

I have a 40w co2 galvo. The 300mm lens is terrible, but I’ve seen some people use a 210 lens on Stanley 40oz cups with a height of 240mm. When I try and force it to burn light burn tells me it cannot work outside the boundary. How can I bypass this. Would I “add” a new lens and make the boundary 250mm but still use the 210 lens?

[@Ferrous_Bueller]

Should I be doing this first before I try to calibrate the red light frame thingy that we use to line up prints?

[@lightburnsoftware7189]

Probably, yes.

[@karlsangree]

Well, that was helpful. I tried the built-in "Calibrate Galvo Lens" but this worked much better. A lot of work, but my machine is now dead-nuts on.

[@ScottFoster-qt1gd]

Is the same directions I can follow for setting up my MOPA laser from SFX Laser?

[@Outofthisworldengraving]

i struggle with angle till i watched this video!!!! i could not figure out why it was tilted when doing business cards, thank you thank you thank you!!!

[@mstefandavis]

Im also setting up a 70mm. First burn and 2 corners arent showing up. Should i scale first?

[@Meowloki1]

That formula for the lengths do not seem to work for me

[@finterjohnston7882]

Excellent video. Clear and easy to follow. Thank you for taking time to do. As with your software.......dependable.

[@DeadEyeDetails]

Great video! One question, can you scale first? I'm currently trying to lens correct a 300mm lens using a 275mm square, but even that is framing over 300mm...any advise? Thanks!

[@lightburnsoftware7189]

The recommendation for running as large as possible is to get as accurate of measurements for our corrections. If it is not possible to run the full size then yes scale down so that you can fit it on your 275mm square and use that for the corrections.

[@zacdeeds2362]

We too had this same issue. We are however still unable to get our Lens correct done. At 290mm the box is spot on. When we start making squares smaller, so 50mm the square measures 49mm. I’m not sure why the corrections are not scaling down as the shape is smaller. If I run the opposite and do lens correction at 100mm and then scale up my 290 square doesn’t measure up properly.

[@michaelhorton2133]

@@zacdeeds2362 I have the same issue. Unless I'm missing something I'm wondering if the field starts to warp/stretch as it approaches the edge of the lens. I'd love a solution.

[@Shembelina]

Was this ever resolved or did you find out what was causing this@@zacdeeds2362? I'm having the same issue with it scaling down incorrectly with my 150mm lens: 150=150, 100=99.5, and 75=74.

[@minorunebunu4228]

I have a 100w fiber optic laser and I have a 110mm lens, but I can't get the settings to show me the same size as in the drawing

[@ihzanursyahbana7773]

So, lets say i was using 300 mm lens fiber laser. So the max outer scan that i can use for my fiber laser workspace is 285 mm for precision dimension?, is that how it works?

[@lightburnsoftware7189]

@@ihzanursyahbana7773 - no, a 300mm field lens gives you a 300mm field. Outside of that 300 you’ll lose precision.

[@ihzanursyahbana7773]

@lightburnsoftware7189 I has bought a 50 w fiber laser recently, with 430 f theta lens (a.k.a 300x300mm lens). shortly, i calibrated my focal length and so on to create a perfect 300x300 mm square and it works. unfortunately, when i create 250, 200, 100, 50 square, there is always minus 2 mm minus on boundary (like 248mm and so on). I tried some trial and error by change galvo software axis, using both ez cad and lightburn. but yes, they has made a same consclusion and problem. Iam really hope i was miss something on software part instead do something or buy another lens for my machine. is there any suggestion maybe? And i used SG7110 galvo head on my machine, not rc1001

[@VolkerPrecisionOfficial]

Can you cheat the field size to a larger dimension than the given lens size? When setting up my 112mm lens I noticed that my initial, uncorrected size was around 25mm larger than the lens size. I sure could use that extra range

[@lightburnsoftware7189]

You can set the field size as large as you like, then adjust the scale factor to fix it to the actual size you’re getting from the hardware. It’s not exact, and most “110” lenses have a bit more usable range than that.

[@krisknowlton5935]

Clear and concise video.

[@gojfert]

I cant found out how to download the Galvo Orientation Calibration program..Hope you will write to me

[@lightburnsoftware7189]

Are you referring to the corefile2 program? That ships on the same flashdrive that your EZCad install is on. If you no longer have it I would reach out to the manufacturer it was purchased from to see if they can provide it.

[@harrygithens3908]

I have a jpt m7 100 Watt mopa fiber laser. I put in all your setting and it cut the paper. I lower the power and it still cut the paper. Do you know what I can do thank you for any help

[@GASNICABRUNATNA]

start with the lowest power possible, move the speed up until it stop cutting, or use a lighter shade of paper?

[@northamericancannonllc]

ugh. i was with you until 3:00. then you left me behind! :( how much for a house call? lol

[@lexispapi]

What I’m not clear about is if this is a square should all sides measure the same. It doesn’t state in the video if all sides need to be.

[@lightburnsoftware7189]

Yes - sides should be the same length, as should the diagonals.

[@Roetty99]

Hello, Unfortunately, the lens correction is inadequate. A 9-point correction is far from sufficient for a scanner system! At least a 25-point correction or better would be required here to achieve dimensionally accurate results over the entire projection surface. I very much hope that Lightburn will address this problem!

[@lightburnsoftware7189]

LightBurn will read the correction files from EZCad, so if you do a 25 point correction there, you can use that COR file in LightBurn. We are working on our own internal corrections as well.

[@Roetty99]

@@lightburnsoftware7189 I'm sorry if I have to disagree! I have tested it several times and one of your German dealers can also confirm it. Lightburn can ONLY read the 9-point calibration from EzCad. The 25-point calibration is completely ignored by LB. There is no error message when importing the .cor but unfortunately the file has no function. Please also read the report in your beta channel. The problem is also described there in exactly the same way. If you have really tested it with a 25-point .cor, please let us know which tool you used to perform the calibration in EzCad. We have used the CorFileEnu.exe. All other tools we know of in EzCad are unfortunately only 9-point calibrations. Best regards Rötty

[@Roetty99]

Hello, unfortunately this is not true! A 25-point cor file from EzCad can be imported, but it will NOT be executed in LB. This issue is already known in your internal beta forum. I don’t understand why this is mentioned here as a solution? Please explain to us how YOU create a 25-point Cor file in EzCad that will work. Kind regards Michael@@lightburnsoftware7189

[@woofguy]

Is the guy narrating the guy from ModBot?

[@authentic4225]

Funny how I always use 254mm lens for 200mm work area lol. And it seems to work fine...

[@isaiahhernandez9257]

Is there a reason why I can’t get my Y axis to bulge out I maxed out both side 1.250 and 0.870

[@lightburnsoftware7189]

There’s a good chance your scale is too high and you’re hitting the physical travel limit of the galvo mirrors. Try reducing the scale or size of the square by 10% or so and see if that helps.

[@larrykent196]

Yes, you got it, great job, no BS right to the point for sure. Thank you very much and cheers!

[@DS-ng2kj]

Can't thank you guys enough! Ya'll r9ck!

[@Roetty99]

Hello, I have already written an answer twice here that the 25-Point Corfile in LB does NOT work! Why is this answer not displayed here? Are you afraid of an uncomfortable discussion? It almost seems that way to me. You always answer with the same false statement that the 25-point cor from EzCad works in LB. NO that is not true! Don't ask us why we need such precision. There are numerous examples of this. Make a statement about when Galvo users can expect a solution. Because the Galvo license can only be used by hobbyists who want to create nice Christmas decorations. Best regards Rötty