Chinese Laser firing two beams from one tube


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    Default Chinese Laser firing two beams from one tube

    my k40 laser has a two half circle shaped beams coming directly out of the tube. I've been reading up on alignment procedures (got it successfully done) but am concerned because they say that while aligning, you should have one beam at each mirror that hits the exact same spot no matter where the carriage is in the x-y plane. it's aligned, but there's a problem.

    I placed paper in front of the mirrors during alignment, but every mirror, at every location, has two holes in the paper. Is there something wrong with the laser?

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    Default Re: Chinese Laser firing two beams from one tube

    Could be. Or could be a scratch in one of the mirrors. If it is like that from the tube to mirror 1 (ie before it hits any mirror) then it is likely a tube issue. Don't know if that would be under warranty but it might be. I had similar one but the second was a lot less and only gave me grief occasionally.

    In case anyone is wondering, I'm the twin of the other gfacer on cnczone...


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    Default Re: Chinese Laser firing two beams from one tube

    Coupler on the tube is clean and I don't see any scratches or cracks on the tube.

    It seems like the laser is running in "TEM01" mode. This thread seems like someone has run into a similar issue: http://www.cnczone.com/forums/genera...eam-power.html

    but there was no conclusion or solution.



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    Default Re: Chinese Laser firing two beams from one tube

    This is not any TEM mode. This is a failure.
    You just need new laser. Or tube as you call it.

    CNC lasers, constructions, service


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    Default Re: Chinese Laser firing two beams from one tube

    Quote Originally Posted by daveoka View Post
    my k40 laser has a two half circle shaped beams coming directly out of the tube. I've been reading up on alignment procedures (got it successfully done) but am concerned because they say that while aligning, you should have one beam at each mirror that hits the exact same spot no matter where the carriage is in the x-y plane. it's aligned, but there's a problem.

    I placed paper in front of the mirrors during alignment, but every mirror, at every location, has two holes in the paper. Is there something wrong with the laser?


    Hi. I am having the exact same problem.

    Were you able to fix it?

    I am getting the double beam directly on laser tube (before any mirror, so its not mirrors or lens problem)

    Anyone know how to fix this?


    Thanks!

    Attached Thumbnails Attached Thumbnails Chinese Laser firing two beams from one tube-thumbnail_a895b608-b005-4c1f-a777-560d9e702be7-3-jpg  


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    Default Re: Chinese Laser firing two beams from one tube

    It sounds like, in fact, your mirrors are not aligned. How are you checking that the beam is hitting the centre of the mirrors?

    Also, laser alignment is an interactive process using smaller and smaller adjustments as you integrate. Start by lining up the with the beam path to the lens as short as possible, then do the same when the lens is moved to the position of the longest beam path.

    To check the position of the beam, the old school way of checking the beam is to fire a shot at a piece of black photographic paper. But a tile or piece of acrylic should do the trick. Have patience and it should be done in under an hour.



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    Default Re: Chinese Laser firing two beams from one tube

    Thank you for the reply. But like I said, the double beam appears on laser exit. Before first mirror, so its not mirror alignment.



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