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Thread: Galvos - Mod to wide angle ! ? poor mans wide angles

  1. #1
    Join Date
    Dec 2006
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    Scotland
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    Default Galvos - Mod to wide angle ! ? poor mans wide angles

    Wide angle galvos have been bothering me for a while ......... mmmmmmm

    http://www.photonlexicon.com/forums/...ght=wide+angle
    http://www.photonlexicon.com/forums/...7516#post57516


    I love to see a picture of them in operation in comparison to standard galvos ....to get a better idea of angle widths in real life.

    What bothers me so much about them is PRICE , they always seem to be damn expensive , and i just cant see why ......they dont need to go fast as their forte is beamshows where speed is not a real issue ...... i can see and imagine WHY its taken a while for 30k/50k galvos to drop in price ...but surely WIDE ANGLE is pretty old if not ancient technology , yet i feel wide angles would be worth a lot in terms of audiance capture ......and even reduce the number of units required to cover the whole audiance area ? ?

    POOR MANS wide angles ??

    Galvos have dropped in price by huge chunks the last few years , i have seen 12k on sale for $150 ! and 30k for $400

    So lets talk 12k ......... if you grab the mirror ( gently ) an move it , theres a phyical barrier inside that stop its movement , i presume some kind of pin ..........

    SILLY QUESTION - Anybody ever moved the barrier / pin ? so the mirror can move more - therefore increase its angles ? LOL


    Ok now there WILL be a thousand reasons not to no doubt , but for the sake of science has anybody Just Done It !

    PAUL

    :-)
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  2. #2
    Join Date
    Jan 2007
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    Default

    Paul
    all the chineese galvos as we know are CT clones and like the CTs there is a paddle on the end of the shaft which is used for optical position feedback. This paddle is in a space created with a plastic former that doubles up as a bump stop to limit the angular rotation of the shaft (on CTs there are rubber bumps). You would need to mod this and its likely to foo up the optical feedback - but if you wanna sacrifice one to try and tell us how you got on

    Rob
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  3. #3
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    Default

    Easy,

    Buy a discoscan from Pangolin

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  4. #4
    Join Date
    Oct 2006
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    Wink

    Quote Originally Posted by dave View Post
    Easy,

    Buy a discoscan from Pangolin

    Ouch!.. ......................
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    allthat... aka: aaron@pangolin

  5. #5
    Join Date
    Oct 2006
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    Default

    this is a really good question, a modification of the optical feedback setup and scan rate limitation may be all that is needed, but there may be other mechanical/magnetic things that limit the scan angle as well. The tuning at the wide angles might be different than the normal range due to magnetic coupling falloff. Not an issue if you keep the control slow and the tuning a bit dampened but something to consider.

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