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Rack and pinion actuator

Discussion in 'Motor actuators and drivers' started by emont69, Jun 21, 2008.

  1. emont69

    emont69 New Member

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    Has anyone looked into something like this actuator to run a 3DOF system with heave?

    http://www.e-motionllc.com/Single_Rack_ ... /p-358.htm

    This actuator can lift 100lb at 4 or 8 inches per sec and it has a duty cycle of 100%. It is a little price at 200$ but I still think this is pretty good value for the price. One issue maybe is the positioning. It can only be positioned to within 1/8 of an inch.
    emont69, Jun 21, 2008
    #1
  2. egoexpress

    egoexpress Active Member

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    Good find!

    They are fast and strong indeed. 100% duty cycle is good as well.

    But keep in mind that those acutators arent self-locking most likely. I cannot tell you how they will behave with constant load in position holding situation (this will depend on the load and the speed of controller/position-tracking).
    As well you have to keep in mind, that you have to put the dynamic factor into your calculations -> masses in movement.
    For example a full reverse of a downways movement will cause the need of more power than to simply move a wheigt in one direction.

    Imho I think they could be well suitable for pivoted simulators with little payload like the SimforceGT.

    But I have doubts that they will have enough power to rock a 3DOFer, even if it will be just a seat on a frame. Though I am not sure.
    They seem to have a wiper-motor connected to the transmission box.

    Regards
    Christian
    egoexpress, Jun 21, 2008
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  3. emont69

    emont69 New Member

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    I am thinking they could be used in conjuntion with the following gas spring which would lift much of the load and carry static weight very well.
    http://www.suspa-inc.com/products/gassprings.htm
    The 267 Newton 5% oil version requires a load of 60 lb to start deflecting then compresses linearly over a stroke length of 15 inches (the stroke length can varied) to a force of 333 Newtons or 75 lb. That is a spring constant of about 1 lb/in!!

    Three rack and pinion actuators and 3 gas springs should do the trick. With those springs you might even be able to use the Firgelliauto actuator boosted to 24V.

    What do you think?

    My problem now is how I connect it all togehter :D so as to avoid lateral motion.
    emont69, Jun 21, 2008
    #3