X,Y,Z robot

Discussion in 'General Electronics Chat' started by Dritech, Sep 14, 2013.

  1. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
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    Hi all,

    I am building an X,Y,Z robot for my end of year school project. With reference to the diagram attached, can I use the ball screw as a rail and as a linear mover? (normally two rails are used and the ball screw is placed in the middle, but to reduce space I was planning to do it this way). Also, when buying a stepper, what are the specification that I have to keep into consideration?

    Thanks in advance.
     
  2. strantor

    AAC Fanatic!

    Oct 3, 2010
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    If your tray is sufficiently wide, it could work. Otherwise it is going to bind up.
     
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
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    I would tend to use a T shape at the upper end with a linear bearing at each end of the T top.
    This would help prevent skew or 'Walking' and binding.
    Max.
     
  4. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
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    Thanks for the replies. If the distance between the ball screw and the rail is of 1 meter, will this cause extra stress on the ball screw or stepper motor?
     
  5. MaxHeadRoom

    Expert

    Jul 18, 2013
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  6. strantor

    AAC Fanatic!

    Oct 3, 2010
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    Yeah IMO you should reevaluate your design.
     
  7. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Also is is usual to make one side non-compliant, the upper side for example, otherwise the two sides have to be Exactly parallel if both are compliant.
    Max.
     
  8. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    See the reprap Mendel at this link.
    http://reprap.org/wiki/Mendel_Build_Manual

    This design uses two slides and a toothed belt and toothed pulleys (looping one stepper motor and each end of the belt attached to the moving platform.

    This design (this device) has become a standard for 3D printing.
     
  9. Metalmann

    Active Member

    Dec 8, 2012
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    Like Strantor said.
     
  10. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Another option that is growing in popularity is the core xy (like an old-school drafting table). Actually an etch-a-sketch uses the same mechanism.

    Here for videohttp://vimeo.com/40914530

    One stepper controls x-axis and one for y-axis but the use one common belt.
     
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