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Thread: Drop down shelf

  1. #1
    Variable Bitrate super-fly's Avatar
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    Drop down shelf

    I want to do this:



    I want to create a shelf that will drop down and go back up with the push of a button. It needs to hold about 3 pounds or so too. I originally was going to try and use an actuator, bit they are way too expensive. I then thought a servo, my only two concerns with this are. One will it hold the weight, and two how do I get it to stop at a certain point.

    What I mean is i will install a rocker button for forward and reverse, but how do I make the servo stop where I want it to stop. I only want it to open about two inches and stop and I also don't want it to close too far. I mean I guess I could just hold the button until it gets to where I want it but that would get annoying after awhile.

    Here is where I was thinking of putting the servo:

  2. #2
    MySQL Error scott_fx's Avatar
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    put a contact switch that will get pressed (and cut power)at full extension of your shelf. and then do the same thing for the lead that controls the reverse direction.

    am i making sense?
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  3. #3
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    Wiredwrx's Avatar
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    I don't think a servo will be strong enough. I think you will need to spring for a linear actuator.

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  4. #4
    Banned xdjxklusivex's Avatar
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    watcha gonna put on the shelf?

  5. #5
    tja
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    3 pounds of stuff... which will slide off 'cos the shelf is on a slope?
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  6. #6
    Variable Bitrate super-fly's Avatar
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    No i'm going to attach it to the shelf...so a servo won't hold it? Any other ideas as to what I could use, those darn actuators are expensive.

  7. #7
    Variable Bitrate super-fly's Avatar
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    Also...I don't have a ton of room to put a long actuator in. I was thinking pneumatic, but then I'd have to hook a pump up and everything.

    I found some stuff on ebay for an air set up, what do you guys think...what else would I need to get?

    http://cgi.ebay.com/Pneumatic-Mini-D...QQcmdZViewItem

    http://cgi.ebay.com/Mosier-Tiny-Tim-...QQcmdZViewItem

    http://cgi.ebay.com/2-in-Stroke-Doub...QQcmdZViewItem

  8. #8
    Confusion Master
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    get yourself down to the scrappy (US Translation : Junk Yard) and half inch (US Translation : Obtain) some window winder motors and actuators from some car doors.

  9. #9
    Variable Bitrate super-fly's Avatar
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    Like this:
    http://cgi.ebay.com/ebaymotors/Brand...35113856QQrdZ1

    Will it be strong enough?

    What about a high torque servo like this:

    http://cgi.ebay.com/NEW-Traxxas-REVO...QQcmdZViewItem

  10. #10
    MySQL Error Scouse Monkey's Avatar
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    or hack apart a G glamp with a coarse thread and hook up the threaded rod to a motor with buttons to stop the motor when open or closed. Make sure you pivot the motor and threaded part on the shelf.

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