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Thread: Need help with laser alignment

  1. #1

    Need help with laser alignment

    Hi all,

    i am having trouble with aligning laser beam on a 130x90cm 120W chinese laser. It seems like when laser head is close to me in front it is centered, but more it goes to back of the machine it is pulled diagonally up and right. I made 9 different measurements in different parts of machine.

    LR= Left Rear
    LC= Left Center
    LF= Left Front

    CR= Center Rear
    CC= Center Center
    CF= Center Front

    RR= Right Rear
    RC= Right Center
    RF= Right Front

    I am attaching image of targets and where the beam is hitting. I dont know which part of the machine needs to be adjusted at this moment, 1st, 2nd mirror or perhaps tube angle?

    And thing is laser is centered on 2nd mirror at all distances...


    IMG_20180204_163355.jpg

  2. #2
    looks to me like you need to move the first mirror CCW a smidge, to counteract the beam moving right, and down a smidge to counteract the beam moving up.

    --a 'smidge' is roughly equal to half a 'hair' -a little goes a long way...



  3. #3
    Join Date
    Mar 2011
    Location
    Olalla, WA
    Posts
    1,424
    Tube angle is irrelevant. As long as the beam hits the center of the first mirror, the first mirror can steer the beam where it needs to go.

    It looks like your first mirror needs to be adjusted. You need to get the first mirror dialed in before moving on to the second and third mirror.

    If the first mirror is adjusted correctly and you still have the spot moving up and down when the gantry is moved back and forth, then your Y rails are not lying on the same plane.

    If the first mirror is adjusted correctly and you still have the spot moving left and right when the gantry is moved back and forth, then your X axis may be askew. Could be a stretched belt, uneven belt tension or something slipping.
    Shenhui 1440x850, 130 Watt Reci Z6

  4. #4
    I found that exact issue- the Y rails were not in the same plane.
    It was an easy fix- the floor was not quite level. I put a packer under the foot of the laser on the ground at the lowest corner, bringing them back to being planar. No mirror adjustment needed in our case.
    Best wishes,
    Ian



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