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  1. #1

    A bit of a desperate plea for help I'm afraid... Does anyone know of any hobby laser support / setup people in Kent UK? I'm located in Dover Kent.

    The issue I have is mirror alignment. After spending hours over a number of weeks I just can not seem to complete this simple task. Each of my many attempts has just ended up with me sobbing in the corner. I'm at the point where I need help and happy to pay for someone's time.

    It's a Shenhui SH-350 (50W Chinese laser).

    When I originally receved the machine it worked out of the box but after an hour or so of firing it stopped working. The vender sent me a new power supply and tube which I fitted (it turned out to be a faulty PSU) and the machine is firing fine again but I cannot nail the alignment.

    I've watched a myriad of videos and read loads of articles around the subject and been though a number of rolls of masking tape but I just can get it right.

    Many thanks,


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  2. #2
    Hi Paul,

    bit out of the way for me to come have a look but I have the same machine as you, I think. Did my alignments recently again too to make sure it was good. What seem to be the issues that you are actually having? Is the spot on each mirror not central? do you have differing intensity/focus with travel?

    I find that if I am not getting good results it is usually warped wood being cut or dirty lenses. May not be your case but do give the optics a clean.

    so let us know what happens and I will try and help you.
    Machine tools and 3D printing supplies. Expanding constantly.

  3. #3
    Thanks for the reply.

    To be honest I’m pretty sure it’s user error!
    It’s difficult to get the laser tube central on the first mirror (to high) then I just can’t seem to get the beam parallel on the second mirror with at least 5mm or so movement at each extremity of Y axis travel.
    Any advice would be appreciated.

  4. #4
    Ivery aligned a few lasers in my time ;-)

  5. #5
    Very impressive! I assume you don’t live near Dover ;) Unfortunately your picture serves to make me look even more inept!

  6. #6
    Im in essex so three if not more hours away, sorry

  7. #7
    Quote Originally Posted by andy_con View Post
    Im in essex so three if not more hours away, sorry
    No problem, sorry to ask!

  8. #8
    post some detailed close up photos, a picture speaks 1000 words

  9. #9
    Sorry for the delay, I've been having some work done to the house which took over my garage (aka workshop).

    I spent another 4 hours or so trying to nail the alignment but to no avail. I have make some mdf laser tube mounts to get the laser tube better centred on the first mirror but still have a lot of movement as the laser travels. I have uploaded a video to youtube and attached pictures.

    I must be doing something fundamentally wrong. I've not been able to use the laser for weeks now. :(

    Link to video

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    Last edited by Wolfster; 28-03-2016 at 12:03 AM.

  10. #10
    Tilt the first mirror up.

    I had to print some new mounts for my laser tube, the originals were crap. I can probably find the .stl files but the only dry 3D printing plastic I have right now is marigold. Probably won't go with your Royal blue.

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