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Linear Actuator Designs ...

Discussion in 'Motor actuators and drivers' started by speedy, Dec 27, 2013.

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  1. adgun

    adgun Active Member

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    @speedy (Any ideas making the Nut without 3d printing ?)
    You only need a drillpress that can drill on a angle.
    With plastic you can use a speed bore (for wood) to make the bearing places.
    You dont need to work precise ,with 3 bearings its centering when clamping
    Regards Ad
    • Like Like x 1
    adgun, Apr 21, 2015
    #41
  2. DanielDk

    DanielDk Member

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    NO :) That is just an example of what one may accomplish with a ballscrew and off the shelf parts.

    40$ is just the ballscrew and nut..

    For an acruator like that you need:
    a ballscrew and nut
    linear rails
    linear bearings
    motor coupling

    around 170$ when all is said and done...

    Heres pretty much all you need for an actuator like the one in the picture:
    http://www.ebay.com/itm/1-ballscrew...555?pt=LH_DefaultDomain_0&hash=item2a35ac3c7b



    Cheers
    Daniel
    • Like Like x 1
    DanielDk, Apr 21, 2015
    #42
  3. bsft

    bsft

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    that makes more sense.
    bsft, Apr 21, 2015
    #43
  4. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    Very interesting. I wonder how the potentiometer could be placed. This linear concept needs an endless turn poti :)
    BTW 3 actators only $355...
    • Like Like x 1
    Pit, Apr 22, 2015
    #44
  5. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
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    I am using a 10 turn pot and suitably sized gearing. You could also use a rotary encoder, but I decided against this, due to the load it puts onto the ARD.
    SeatTime, Apr 22, 2015
    #45
  6. speedy

    speedy Well-Known Member

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    Guys I'm still bouncing back and forth between these two Ideas and I believe there is a good connection that can save real money ... Just I can't see it .

    Diy linear bearing ...
    https://www.google.com.eg/search?tbm=isch&q=diy linear bearings&revid=313143266&ei=mTk3VcfuLoumsgGiq4DoDw#imgdii=Z7RK5FczKTlSWM:;Z7RK5FczKTlSWM:;uoS8jxodRa1YuM:&imgrc=Z7RK5FczKTlSWM%3A;fdSgmnn38MtVcM;http%3A%2F%2Fwww.subatomicglue.com%2Fcncl0g%2Fthumbs%2FIMG_4000.JPG;http%3A%2F%2Fwww.subatomicglue.com%2Fcncl0g%2F;150;103


    thread-less ball screw ...
    https://www.google.com.eg/search?q=threadless ball screw&biw=1280&bih=638&source=lnms&tbm=isch&sa=X&ei=sBM3VaOyNMaksAHByYHYCg&ved=0CAYQ_AUoAQ#




    and I don' t have a drill press that can operate on angle .

    Help please ...:sos
    Last edited: Apr 22, 2015
    speedy, Apr 22, 2015
    #46
  7. speedy

    speedy Well-Known Member

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    @Pit @SeatTime For the pot there is an easy DIY way for wooden gear covered with a peace of timing belt ... super quit and can have a bearing in it's center feature .:thumbs



    This can be used for the 10 turn pot attached to it on one side ... and using another gear on the other end with a timing pulley running along and attached to the thread-less screw nut going back and forth along the Axis length ... turning the pot so exactly giving the precise position .
    • Useful Useful x 2
    Last edited: Apr 22, 2015
    speedy, Apr 22, 2015
    #47
  8. speedy

    speedy Well-Known Member

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    My Motion Simulator:
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    I've got another idea ... the same wooden timing pulley used above for the 10turn pot ... can be used running on a straight fixed half of the same timing belt along the motion rang ...
    both may be used as DIY "rack and pinion"

    edit: Plus ...a wooden planetary gears are available to use by this option ... for high torque and quite operation :thumbs



    http://woodgears.ca/gear_cutting/template.html
    Last edited: Aug 3, 2015
    speedy, Apr 22, 2015
    #48
  9. SeatTime

    SeatTime Well-Known Member

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    These are great ideas:thumbsunfortunately, I don't have the space in my new actuator to run a gear system beside the ball screw and with 80 turns end to end I need a 8:1 ratio, so the size of these timing belt gears would not fit nicely within my casing.
    SeatTime, Apr 22, 2015
    #49
  10. speedy

    speedy Well-Known Member

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    @SeatTime
    speedy, Apr 22, 2015
    #50
  11. adgun

    adgun Active Member

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    This will work to verry sheap.
    regards Ad

    Attached Files:

    • Useful Useful x 1
    adgun, Apr 22, 2015
    #51
  12. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Just a some suggestions.

    You can download the 3D print file for threadless ball screw here @speedy, if you want to give it a go: http://www.thingiverse.com/thing:112718

    And if you need a 3D printed part but do not own a printer then you could use the world wide directory of those who do and who can print a part for a small fee: https://www.3dhubs.com/

    You can also get a drill press pretty cheap these days if you know what you need and shop around.
    • Informative Informative x 1
    noorbeast, Apr 22, 2015
    #52
  13. speedy

    speedy Well-Known Member

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    @noorbeast ... Really cool :thumbs ... The issue with 3d printing is you wont get solid nut that can withstand the force and torque ... it may split and crack easily ... even if the print orientation changed ... it will just crack from another place .
    Cracked_rider_0915.jpg
    http://forums.reprap.org/read.php?14,328230,328627#msg-328627

    I just believe it can be made with these metal brackets ...
    truck_offset_aug11.jpg 2images.jpg 1images.jpg 3images.jpg
    And I keep turning my thoughts 70-80 degree to convert it from linear to circular and I fail to figure it out every time :grin
    Last edited: Apr 22, 2015
    speedy, Apr 22, 2015
    #53
  14. adgun

    adgun Active Member

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    Hi speedy
    I hope this helps

    Attached Files:

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    adgun, Apr 22, 2015
    #54
  15. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    If splitting is the concern then machining rather than 3D printing would be the better option.
    • Agree Agree x 1
    Last edited: Apr 22, 2015
    noorbeast, Apr 22, 2015
    #55
  16. speedy

    speedy Well-Known Member

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    OMG ... Excellent big man .:thumbs

    I'm sorry my bad ... I didn't mention that it needs to be tilted a little so to engage with the threads like this
    ThreadlessBallScrewjpg.jpg

    and to give it an option to be used with threaded and thread-less rods like this one ...
    550x200.crop.jpg 20130822_threadless_thread_900_preview_card.jpg

    edit: I'm sorry I may be little speedy on questions ... but can we Angle Grind the locations which the steel corners will be bolted to ?
    speedy, Apr 22, 2015
    #56
  17. speedy

    speedy Well-Known Member

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    • Like Like x 1
    • Informative Informative x 1
    Last edited: Apr 22, 2015
    speedy, Apr 22, 2015
    #57
  18. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    just genius...
    • Agree Agree x 1
    Pit, Apr 22, 2015
    #58
  19. speedy

    speedy Well-Known Member

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    speedy, Apr 22, 2015
    #59
  20. speedy

    speedy Well-Known Member

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    Threadless Ball Screw Bench Speed and slip Test ... 5:45
    • Like Like x 1
    Last edited: Apr 22, 2015
    speedy, Apr 22, 2015
    #60
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