Improve Engraving Quality (Correct Scan Offset) on CNC Co2 Laser RD Works/LightBurn Software Config
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- Опубліковано 13 чер 2019
- "When laser scans the graphics in two-way maybe cause the edge of the scanned graphics
uneven due to the relationship between the machine belt tensions. Therefore, increase backlash to correct it. It has the specific backlash for the certain speed. Generally, the faster the speed, the greater the backlash." (Ref: RD Works User Manual) - Note this is known as Scan Offset Adjustment. I use both terms, however there is a difference in backlash which I plan to discuss in a future video.
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In this video I explain how you can adjust the reverse offset feature (aka backlash) in RDWorks and LightBurn to improve the quality of your engraving at set speeds.
It is important to note that these fine tuning adjustments are only made to the engraving speeds that you use most and will need to be adjusted for every speed you use. For example if you engrave regularly at 300mm/sec and you make the adjustments for the speed of 300mm/sec these adjustments only take effect when 300mm/sec are used on a layer. That means if you change the engraving speed to 299 or 301mm/sec then the reverse offset adjustments are no longer in effect.
So with that in mind, let us look at how we go about adjusting and fine tuning these to our requirements.
I have set the line interval on this test to 0.5 mm so it separates the lines and you can see them more clearly.
If the backlash is not corrected it can produce poor quality engraving. Something to note is it common for the step distance to be greater for increasing speeds, for example a 600mm/second line has a greater step and therefore each speed will need to be fine tuned individually. So it is only necessary to fine tune these reverse offset adjustments for the engraving speeds that you use.
I hope this video is useful. If you have suggestions for other videos of tips and tricks on the Co2 Laser, send me an email (address below) and I will see if I can make time to produce one for that topic.
Recorded with a Logitech C922 - amzn.to/2NcR5Nw
Thanks for Visiting.
Until next time, take care
Cheers Matthew
(MW Laser)
Visit Matt's Workshop at MW Laser : mwlaser.com.au/
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![[08] RuiDa Controller - Calibration of X and Y Axis for CNC Co2 Laser - RD Works](/img/n.gif)
You created one of the most helpful, easy to understand resources for affordable co2 laser owners, all over the world. I am one of the many who purchased a Chinese red and black (60w) 50w from amazon during this pandemic. I'm in Las Vegas Nevada and utilize your knowledge from your many different videos to help me through new user problems, set up improvements, to better overall outcomes and purchasing decisions. Thank you
You're welcome. Thanks for the feedback. I'm glad you find them useful.
Cheers Matt
Thank you for this help video. This is exactly the problem I am having. Mostly due to the fact of just recently getting a co2 laser coming from a slow diode which I never had an issue with. Thank you very much.... after commenting here i went and played with my machine and it is an amazing the difference in quality
Rock solid assistance.
Separating the lines makes it easier ans MUCH faster to find the actual offset. I created a couple of planks with the results and the choice made, and then that allowed me to get my second PC set up with all of the offset settings. My designs are CLEAN now! Thank you!
you're welcome
Looked on other sites for same information, but found Matt's to be so much easier to understand thx.
Thanks Wayne :)
just found this and I think its very good info. Thankyou. You now have a new subscriber
Thanks, I appreciate the feedback
Thank You as many have said this video and explanation has been priceless for me. I do have a question though. I have lightburn and input on device settings for all power settings I use. When I use old files when I open the device settings the old settings are there. Can I save the new settings in the software as you mentioned and will work with the old files?
This was helpful. Thank you!
Thanks, Maybe it's time for me to improve on this video demonstration :)
Good tutorial Matt!
Thank You
Cheers Mate. Magic as always
You're welcome
Thank you for the video, spot on!
Glad it was helpful!
Thanks for your advice it really helps
Thanks, I appreciate the feedback
This is just what i need to tune up my laser.
On slower speed and mdf i notice the backlash more. But on ply at same speed.. It looks fine.
On mdf at higher speed.. I loose detail.
So.. Backlash and scan offset are my problems.
Backlash appears to be a feature that came out a year after this video.
Will be nice to turn back on bidirect scanning.
Very helpful thx Matt
:) Glad you liked it
Hey Matt, thanks for the great video. Do you have any advice as I tried the settings you gave, but I am just not aligning 100%, tried various speeds also, but still do not get perfect alignment? The only difference is I am testing on wood, and not sure if that is the reason, but as I run mostly wood, I thought to test it. Why I got onto this video is due to trying my chuck rotary and getting a slight ghost image when engraving on cups.
I am using Lightburn, on a 100W W4 Reci laser from CN
I can try to assist you via email, send some photos of your latest adjustments and a screenshot of the scan offset settings you have currently in LightBurn - to matt@mwlaser.com.au Cheers
Awesome video thanks
No problem 👍
I hope all is well. I've just been using my laser a lot more and noticed something. Where there is a name like Chloe the outer edge on the top of the L is perfect but where it has the o and e on the same scan line it's not. I thought it's a backlash setting but it made it worst. What I have found that whilst it's important to line up the edge it's also important to line up the inner lines (where text is for example) and the only way I've been able to do it is to find a balance of the outer and inner. Do you have any suggestions? I believe it's more just a limitation of the glass tube laser not firing precise enough
In the manual it says that it creates an offset throughout the range based on the values you enter. if you add 2 points ti creates a line between and adjusts the value if you were to change to 550 it will put the value half way between the 500 and 600 offset you added.
the more points you add the better the curve accuracy
I'm not following what you are referring to. email matt@mwlaser.com.au Cheers
I ran this test and found that the strokes aligned perfectly on the left hand side, but the lines were staggered on the right hand side. What does that mean?
We have a CAM5 dual laser tube machine. Laser tube #1 is lined up perfectly (scanning both left and right) and Laser tube #2 has a Scanning Offset problem. With Lightburn software, can you Adjust the Scanning Offset individually on the two tubes? Thanks for all the great info and video!
yes.., but.. You will need to save setting for Tube 1, then create settings for Tube 2 and also save separate.
Then when using Tube 1 load those settings, and the same for Tube 2. If you require further explanation than I can give in this UA-cam Comment email me askmatt@mwlaser.com.au Cheers
Nice video. Thank you. New subscriber
You're welcome
Does this tutorial is good also for diode owners?
good information
Thanks
Hi..thanks for your video. It really awesome. I have CO2 Laser machine with RD Work V8. I am trying to do the scan offset, however when my laser start scanning at 0.5 mm interval, I did not get the perfect straight line as in your video, the scan line is wavy. I have tightened all the belts but I did not check the laser's alignment yet. Is have to do with the alignment? Really appreciate if you can give me some tips about it. Thanks
wavy lines when cutting are usually caused by loose mirrors or lens.
Been wondering what was happening with my machine. Hopefully this will fix small issue I was having. Thanks
PS Subtitles gone wrong 1 second in
Thanks.
No Meth made here :) CC's are auto created.
@@MWLaser wow, what a difference this makes! Maybe it’s been changed in a recent version but lightburn now calculates the in between speeds meaning that 601mm/sec will still be adjusted for but it just won’t be precisely calibrated.
I have installed a new CR70 laser tube and power supply and have corrected the reverse scanning offset, but I have a short burst of energy that happens after each line is scanned when the laser should be off. Is there a way I can send you a picture which shows the problem?
Greetings matt If you can make a detailed video on how to make rubber seals and get a stamp with a Chinese machine with excellent accuracy, thank you
Thnkyouuuuu so much ❤️🙏
You're welcome
Hi, thanks for your video. I have a ruida controller and in scan mode if for exemple I engrave a circle with 2cm my x axis travel 15cm more in each side in each pass, like accelerate before engrave and desacelerate after engrave, it make the circle, but is not normal, do you know the reason for do that?
Acceleration settings. The faster you engrave the longer the "over swing" will be.
I saw this video before, liked it - but thought "NAAAH, I'm good".
Just ran a faster job and OMGOSH!!! It was horrible.
Came back to this video and BOOM - perfect!
Thank you for this helpful video.👍
Glad it helped, cheers
hello do you have any suggestions for cutting a perfect circle? my laser wont cut a perfect circle i tried few different suggestions from forums but i cant get it right. Thanks
Try calibration of your x and y axis. I have a video on that for the ruida controller if that's what your using. Cheers
Hi there. Thank you for really helpful tips😁👍 I would also like to know...do you have any advice on how to get the perfect results when engraving photos. I am really struggling...I have Inkscape, CorelDraw, Gimp and I use Lightburn. So any tips and tricks in one of these editing software programs would be really helpful and offcourse appreciated. Thanks so much in advance. Regards
Roselle
Photo engraving is not something I do much of at all, I recommend checking out Facebook or forum groups for laser photo engraving for more advice on that subject. Cheers Matt
@@MWLaser Ok thanks a lot for your reply. Much appreciated 😁👍
What is the speed for a 40K omtech ?
hi my laser when igo to make scan to some thing it scan 2 thing beside
Hi. Silly question but is that just for acrylic ? Thanks. Great video
No. It's the engraving setting adjustment, and not material specific
I have a problem with the quality of the engraving in the Lightburn program, the quality is poor .. and when I use RD Work it becomes fine .. knowing that it worked well in the past on both programs
I did the same test as you. When engraving I saw that the second line when the laser head moves from the right side to the left side the engraved line is not straight, it's wobbly. I tried everything I can think of to get rid of that but it won't go away. Any idea what could cause that?
Try to reduce vibration in the machine by using a rubber legs under the machine not the wheels, and also check your belts and make them tight, if everything above is ok try to reduce the speed of engraving it'll help
this is your accelaration speeds, try reducing them slightly and test again until you reduce these wobbles
Hey Matt, when Im doing this test, i noticed that my lines are shaky and wobbles. What does that mean?
Three things you could check
1. loose lens or mirrors
2. worn bearings
3. other mechanical vibrations
Same, but only the line when the laser head engraves from the right side to the left side. I have checked everything but that line is always wobbly. Don't know how to fix it or what the cause of it is.
@@MWLaser i checked everything but the lines from right to left are still wobbly. Really don't know why, that gives me headaches because I want to find out why that is and I just can't find an answer. I posted the question on about 5 laser groups on Facebook so far but no one has a clue. 😭
Just curious, how come you don’t engrave as fast as possible all the time? You mentioned you commonly use from 100-300mm/sec
Higher speed engraving requires more power and often reduced clarity, unless calibrated correctly. Also some materials will only produce the required results when engraving at slower speeds.
Hiiiii
Please help me!
My laser machine has positive backlash 1.5 mm
As I see you're taking about negative backlash
I mean if I change the backlash to 1.5 mm I will get 3 mm backlash
Can you help me how can I get -1.5 mm backlash???
Please please 🙏🙏🙏
try halving the reverse offset to 0.75mm or -0.75 see if that makes a difference.
If you still have trouble email Matt@mwlaser.com.au
@@MWLaser thank you so much🙏🙏
I tried that it's working very well😍😍😍
Big big thank you buddy. 👍
should update as you mention false info. by using a full range of speeds, will use diode laser in mm/min as example, if you ran a range of speeds from 500mm/min to 6000mm/min in 500 increments, inputting results for this range will create additional data within the software for any speeds in between all of these so 750, 900, 1200 etc.
you state you have to do one for every scan speed you use, this isnt the case