swivel mechanism

Discussion in 'General Electronics Chat' started by PRATIK BAKSHI, Aug 9, 2014.

  1. PRATIK BAKSHI

    Thread Starter New Member

    Jul 30, 2014
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    Hello friends :) ,I got a project in which I have to perform swivel mechanism(rotating swivel of 30 kg)...here I am using motor to swivel gear arrangement (1:4 teeth ratio)so that small motor will be able to rotate it...and sonar system for obstacle detection but the main problem is that I hv to stop it in a particular direction(multiple points and point will be fixed at site point and bot should completely automatic)so suggest me any specific idea for it....not using wheel encoders????
     
  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    Assuming that you are using a microcontroller, use a stepper motor, so you can use the step/direction to know the sonar's position.

    Ken
     
  3. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Unless you have a very powerful motor I think you'll need a gear ratio much greater than 4:1 to rotate a 30kg load in a controlled way.
     
  4. PRATIK BAKSHI

    Thread Starter New Member

    Jul 30, 2014
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    #KMoffett sir really thanks for your suggestion.
    Sir but if we vl use stepper motor then it vl unable to lift the 30 kg load of swivel to whom it is rotating ...
     
  5. PRATIK BAKSHI

    Thread Starter New Member

    Jul 30, 2014
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    #Alec_t sir I appreciate your idea :) but sir gear ratio of motor to swivel as 4:1 is not a practical idea.... Am I right???
     
  6. Alec_t

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    Sep 17, 2013
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    That's what I was suggesting. I'd use a much higher reduction ratio (e.g. 1:400?). How fast does the sonar have to rotate (rpm)?
     
  7. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    I thought you said you wanted to "rotate" a 30Kg object, not "lift" it. With a 1:400 gear system (per Alec-t) a reasonably sized stepper motor can move 30Kg.

    Ken
     
  8. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    My CNC machine with a 12 mm diameter 8 mm lead screw can push 100 kg with ease, with a standard size 23 stepper motor shaft connected directly to the screw.

    If it was a leadscrew with a finer lead, like a 1 mm pitch, it could directly push or lift >500 kg.
     
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