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  • How design a multi pulley & belt system that ensures positional accuracy at end?

    Discussion in 'The main mechanical design forum' started by Alyan, Feb 25, 2019.

    1. Alyan

      Alyan New Member

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      How design a multi pulley & belt system that ensures positional accuracy at end?

      I'm designing a SCARA robot. All the servo motors will be placed at base and driving force is transferred thorough pulley mechanism. Each joints are connected by harmonic drive.

      But I'm worried about positional accuracy at end because of the accumulated backlash of timing belt. Could you give me a tip for this problem?
       
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    3. Dana

      Dana Well-Known Member

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      If the harmonic drives are at the joints, increasing the reduction ratio (so the belt moves less for a given amount of joint movement), errors due to belt backlash will be proportionally reduced.
       
    4. Mark_Armstrong

      Mark_Armstrong Active Member

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    5. SenthilJPrakash

      SenthilJPrakash Member

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      If you need super accuracy, then you could put the feed back system such as encoders and resolvers at the other end of the belt.
       
    6. Keith Martineau

      Keith Martineau New Member

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      You might also consider a toothed belt. I like the encoder idea also.
       
    7. oclassapp

      oclassapp New Member

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      Here is an interesting discussion of the belt tensioning system in a SCARA robot that reduces the reaction by pulling the belt. o class
       
    8. Oilytrunk

      Oilytrunk Well-Known Member

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      Almost everything has its pros and cons one of the main disadvantages of robots is that they are replacing the human workforce in many areas.
       
    9. s.weinberg

      s.weinberg Well-Known Member EngineeringClicks Expert

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      I believe that various studies have shown that that is actually largely an unfounded fear.
      As automation increases, typically employment increases as well.

      Robots let you do more stuff, but there isn't generally a hard limit on stuff you can do, so the more stuff you are doing ends up requiring more humans in the loop than without robots involved.
       
    10. steven_hg

      steven_hg New Member

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      I would try linear track drives, which have less backlash.
       
    11. steven_hg

      steven_hg New Member

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      I completely agree. Whatever one may say, robots cannot replace humans completely. We will always control, manage and guide robots. And they, in turn, will make it easier for us to do many things that used to be more costly.
       

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