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Balancing a 3DOF platform

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by BeijingDirk, Apr 1, 2009.

  1. BeijingDirk

    BeijingDirk New Member

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    I have been thinking about balancing the weight of my motion platform with a pneumatic cilinder.

    The cilinder will be attached to an air buffer that keeps the pressure more stable during heave of the platform. This way the force coming from the cilinder is very stable and not depending the height of the platform.

    I will also make the pressure variable by a pressure regulator. This way the force on the cilinder can be adapted to the weight of the motion platform. So if i add more features and weight to the platform, I only have to give the pressure regulator a turn.

    Main reason is the load on the DC motors can be balanced very accuratly.

    The compressed air will be delivered by a small car compressor. You can find one for about 10-15€.

    The attached drawing can give some explenation.

    Does anyone know if this will work?

    Attached Files:

    BeijingDirk, Apr 1, 2009
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  2. Mambo

    Mambo New Member

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    Sure it will. This is used on big CNC machines. You can try use gass spring it has almost constant force and you dont need compresor. If you need only small force you dont need compresor at all you can use vacum :D that give you 1 atmp pressure
    Mambo, Apr 1, 2009
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  3. BeijingDirk

    BeijingDirk New Member

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    It needs to carry till 200-300kg. So, I don't think it's possible with gasspring. Have been thinking about it.

    Greets,
    BeijingDirk, Apr 1, 2009
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  4. Mambo

    Mambo New Member

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    well 2000N is 60 piston (and 6 bar) i doub that compressor for 15E is enought. What about hydraulic ? but passive (two cilinders one with small diameter and one with big)
    Mambo, Apr 1, 2009
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  5. BeijingDirk

    BeijingDirk New Member

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    I'll have a 80 piston and a 5 liter buffer. Stroke is 250mm.
    If the compressor is not strong enough, I still have a big one in the basement. But I wanted to make the platform self sustained without to much connections. Only 1 USB and 1 220V.

    It will take a few minutes to bring this system under pressure, but the big advantage is that it's easy to adjust the platform load balancing.

    Anyway, do you have a drawing of the hydraulic setup you mentioned?
    BeijingDirk, Apr 2, 2009
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  6. Mambo

    Mambo New Member

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    Mambo, Apr 2, 2009
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  7. BeijingDirk

    BeijingDirk New Member

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    Mambo,

    it doesn't seem to be possible to open the link.
    BeijingDirk, Apr 2, 2009
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  8. Mambo

    Mambo New Member

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    Works to me (on two computers)
    but it is in attachment
    hydraulika.gif
    Mambo, Apr 2, 2009
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  9. BeijingDirk

    BeijingDirk New Member

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    Ok, I understand. It's Pascal's Law. Yes this is a good idea. I'll think about it

    So, Use the small cylinder for balancing, and the big one is used to give the balancing force with a spring or whatever.

    Thanks,

    Dirk
    BeijingDirk, Apr 2, 2009
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  10. Mambo

    Mambo New Member

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    No spring but counterweight so you can adjust it easily.
    Mambo, Apr 2, 2009
    #10