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  1. #1
    Join Date
    Jul 2009
    Posts
    17

    Exclamation CO2 laser cutting white acrylic- burns

    Hi all
    I have a problem cutting white acrylic with 60w laser engraver. When cutting the laser leaves black burns on the side of acrylic( picture attached) I tried :
    1. Cut by 2 times with less speed or power
    2. I tried to set corner power 0, 50 and 100, but not much help from that too
    3. The acrylic should be good qualitty too, because I tried few tipes, but same problem

    I almost lost my hope... I bought this laser to cut acrylic mostly, and white, cream acrylic should be one of my favorites...


    Please help me with advices, what could be a problem with white acrylic
    Click image for larger version. 

Name:	picturepvz.jpg 
Views:	417 
Size:	289.5 KB 
ID:	97064

  2. #2
    Join Date
    Feb 2005
    Posts
    469
    Have you tried raising the acrylic above the cutting bed a little by putting maybe 1/4" pieces of wood under it? Maybe you are getting flash burn when the beam reflects off of the metal cutting grid sections.

    Or, does the material come with the protective paper on it? Could you cut it first and remove the paper when done?

    Maybe you could attach one of the drawings you use so that we could look at it also.

    Regarding the corner power, if I'm cutting acrylic at 60 power, I set the corner power to 59. I don't know if that actually helps or not but that is how they cut acrylic in the demo video I received with my laser. They set the corner power one less than the main power setting.

    Try raising it above the cutting grid a little, that might help.

    Skip

  3. #3
    Join Date
    Nov 2009
    Posts
    314

    You machine problem

    Hi,

    Try to set corner power 40.

    And another way go to adjust the air assist a little on laser head,

    I don't know which kind compressor you use, if those doesn't work out, I suggest you to consider a professional compressor.(nuts)

    Regards
    Mike
    [email protected]
    www.xyz-tech.com


    Quote Originally Posted by VBLietuva View Post
    Hi all
    I have a problem cutting white acrylic with 60w laser engraver. When cutting the laser leaves black burns on the side of acrylic( picture attached) I tried :
    1. Cut by 2 times with less speed or power
    2. I tried to set corner power 0, 50 and 100, but not much help from that too
    3. The acrylic should be good qualitty too, because I tried few tipes, but same problem

    I almost lost my hope... I bought this laser to cut acrylic mostly, and white, cream acrylic should be one of my favorites...


    Please help me with advices, what could be a problem with white acrylic
    Click image for larger version. 

Name:	picturepvz.jpg 
Views:	417 
Size:	289.5 KB 
ID:	97064
    http://www.cnczone.com/forums/attach...1&d=1263018580
    Attached Thumbnails Attached Thumbnails EXLAS6090.JPG  

  4. #4
    Join Date
    Jul 2009
    Posts
    17
    [QUOTE=SkipW;715623]Have you tried raising the acrylic above the cutting bed a little by putting maybe 1/4" pieces of wood under it? Maybe you are getting flash burn when the beam reflects off of the metal cutting grid sections.
    I'm cutting acrylic in same way- I put 0,5cm pieces of wood in the corners. The acrylic is cutting in the air- no touch with table

    Or, does the material come with the protective paper on it? Could you cut it first and remove the paper when done?
    I tried cutting with transfer paper, but the problem is not on acrylic surface, but in the cuting border or how it says. Sorry for my english
    Maybe you could attach one of the drawings you use so that we could look at it also.

    Regarding the corner power, if I'm cutting acrylic at 60 power, I set the corner power to 59. I don't know if that actually helps or not but that is how they cut acrylic in the demo video I received with my laser. They set the corner power one less than the main power setting.

    Try raising it above the cutting grid a little, that might help.

  5. #5
    Join Date
    Jul 2009
    Posts
    17
    Quote Originally Posted by EXLASer View Post
    Hi,

    Try to set corner power 40.

    And another way go to adjust the air assist a little on laser head,

    I don't know which kind compressor you use, if those doesn't work out, I suggest you to consider a professional compressor.(nuts)

    Regards
    Mike
    [email protected]
    www.xyz-tech.com




    http://www.cnczone.com/forums/attach...1&d=1263018580
    My laser came with basic air pomp and has no adjusting. Is there any way to adjust it? I tried to stick half of the hole that brigs air to a laser head, but it's not easy to do and I thing the same air amount comes. I tried to turn the air asist off even, but same problem. And you know, how I could know that with profesional air pomp ( You think I need more air pressure? ) that cost money I'll get what I want ? Today I''ll try to do some more testings with power and speed and so on. I'll let you know how was it Thank you all for your time

  6. #6
    Join Date
    Jul 2008
    Posts
    776
    Did you try 3M Citrus cleaner?

  7. #7
    Join Date
    Jun 2008
    Posts
    69
    Hi VBLietuva,

    I have Rabbit laser HX4060-S, with optionally 60W tube. I made some tests
    with cutting white acryl. Attached you will find a few photos of the cuttings.
    In this case my settings was; power 40% - speed 9% - corner power 30%.
    I was testing also with several different settings but in any case couldn't
    get the results as shown in your photo. There was some small spots of dust
    after cutting, but I wiped those off using 3M-citrus cleaner ( purchased from
    Litografa - thanks ! ). Your problem could cause by the driver, so my advise
    is just to try to install the driver again... ( this is my opinion - here on this
    forum is a lot of people who knows these machines 1000 times better than
    me ) But I have had some troubles also with my engravings and after
    reinstalling the driver I notised that many of those was solved...

    Good luck,
    - Hannu
    Attached Thumbnails Attached Thumbnails DSCN0655.jpg   DSCN0656.jpg   DSCN0663.jpg  

  8. #8
    Join Date
    Feb 2009
    Posts
    123

    White Acrylic

    Hi All

    i have noticed that the white acrylic seemsto be more sensitive to heat than the other colours. i have managed to set it on fire on one occasion when doing detailed cutting!

    I use a product called "Brasso" which is household metal polish to remove staining with a soft cloth. its good stuff to have if you are working with acrylic. it will dull the surface of clear acrylic though!


    regards

    KpBadger

  9. #9
    Join Date
    Feb 2010
    Posts
    0

    White acrylic cutting

    My white acrylic always gets black burn along cuts - even worse when air assist is used. I mask the surface area before cutting. Best tape is TRANSFER RITE ULTRA medium tac. Be sure not to have air bubbles or the adhesive will scorch a light brown spot on acry. This mask can remain on the acry for up to 1 year & still have clean removal. I set it for 1 pass cut thru.
    GOOD LUCK
    Quote Originally Posted by VBLietuva View Post
    Hi all
    I have a problem cutting white acrylic with 60w laser engraver. When cutting the laser leaves black burns on the side of acrylic( picture attached) I tried :
    1. Cut by 2 times with less speed or power
    2. I tried to set corner power 0, 50 and 100, but not much help from that too
    3. The acrylic should be good qualitty too, because I tried few tipes, but same problem

    I almost lost my hope... I bought this laser to cut acrylic mostly, and white, cream acrylic should be one of my favorites...


    Please help me with advices, what could be a problem with white acrylic
    Click image for larger version. 

Name:	picturepvz.jpg 
Views:	417 
Size:	289.5 KB 
ID:	97064

  10. #10
    Join Date
    Feb 2009
    Posts
    123

    Exclamation White Acrylic.

    Hi all.

    Just a thought- might there be inconsistency in acrylic from various manufacturers? Or different variations on the polymer known generally as 'acrylic' but that might be chemically different from Perspex TM ?


    i have found the white to be a bit sensitive to smoke staining on the surface but it should definitely not get black burn marks. certainly the cut should be clean.


    Does your material have a manufacturers name on the protective film?
    Maybe try sheet from a different supplier to see if that makes any difference.


    The last white material i had was by "Repsol" and it cuts just fine.
    (though it caught fire once! )


    Cheers
    KPB

  11. #11
    Join Date
    Jul 2008
    Posts
    776
    KPBadger - the current problem on market here in Baltic countries is that due crisis you can't find good choice of quality materials at acceptable price. Closed circle - crisis - less money - less spending for signs/advertising - smaller orders from manufacturers - bigger transport expenses - end user price became higher. So in crisis time price became even higher for quality materials. In this situation more peoples look on cheaper Chinese materials.
    Speak about quality of Chinese acryl is very problematic. Just example. One of my customer have got big order for promo items from beer company. As usual negotiations were long and hard, so customer start looking for materials to fit price. Suddenly find perfect acrylic sheets in China at perfect price, buy them, deliver and start production. Material LOOKS LIKE REAL ACRYLIC, but when he start cut it with laser, he immediatelly understood that this material CONTAIN PVC as after first day all metal parts on laser were coverd with rust

  12. #12
    Join Date
    Jan 2012
    Posts
    0
    Quote Originally Posted by VBLietuva View Post
    Hi all
    I have a problem cutting white acrylic with 60w laser engraver. When cutting the laser leaves black burns on the side of acrylic( picture attached) I tried :
    1. Cut by 2 times with less speed or power
    2. I tried to set corner power 0, 50 and 100, but not much help from that too
    3. The acrylic should be good qualitty too, because I tried few tipes, but same problem

    I almost lost my hope... I bought this laser to cut acrylic mostly, and white, cream acrylic should be one of my favorites...


    Please help me with advices, what could be a problem with white acrylic
    Click image for larger version. 

Name:	picturepvz.jpg 
Views:	417 
Size:	289.5 KB 
ID:	97064
    Hi,
    please contact info....

  13. #13
    Join Date
    Sep 2011
    Posts
    296
    Hi VBLietuva,

    Maybe it's the problem of your material which has a low ignition point.

    You can try to add air in to avoid burning. First make sure the air assist is in the right direction to the material. You can try to add a large power air pump or even a air compressor.

    You can also try spraying some water on the surface of the acrylic when cutting.

  14. #14
    Join Date
    Apr 2011
    Posts
    112
    Its polycarbonate or it has laser master peach in it used for marking

  15. #15
    Endurancerobots Guest

    Re: CO2 laser cutting white acrylic- burns


  16. #16
    Endurancerobots Guest
    Endurance L-Cheapo laser test

    Cuts wood, plywood acrylic upto 2 inch.
    Wait for new tests with compressed air and vacuum cleaner
    https://youtu.be/FQtI5c7s6nA
    https://youtu.be/4KOZXNG05TI
    https://youtu.be/Hwy9GsZvarI
    http://www.youtube.com/watch?v=lHwT63qztg8

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