My Brushless Gimbal Conversion + Flying Footage!

Discussion in 'Camera Mount Misc' started by Josh Lambeth, Jun 17, 2013.

  1. Bill Collydas

    Bill Collydas Active Member

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    Jose, I haven't done any flying test yet. But on the bench trying to move the tilt or the roll by external forces like (my finger)I can feel the resistance. With direct drive the resistance is nil.
    The new gimbal that I built I have belt on roll and tilt. I want to see how the pan will handle the wind, cause the cinestar legs act as sails and she might she might lose position hold.
    I used the C300 and the 6D I don't have an Epic.
    Bill
     

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  2. Jose Luis Ocejo

    Jose Luis Ocejo Active Member

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    Thanks Bill my surprise in reading the brushless gimbal posts is the realization that the current of the shelf gimbal motors have very little torque, very little resistance so how does this relates to the stated camera weight capacity that iflight or others motor manufactures claim?
    or I guess the claim specs are correct up to a about a 5D weight
     
  3. Bill Collydas

    Bill Collydas Active Member

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    I guess so IF the camera is balanced properly.I mean so far no one flew with a camera bigger than a 5D or c300 in headwind to prove otherwise. And I don't mean holding the gimbal from a moving car.
    I hope the MoVi can do that
     
  4. Jose Luis Ocejo

    Jose Luis Ocejo Active Member

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    Yes I hope that too there so much expectation specially
    When the first videos from regular customers come out
     
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  5. Devin Card

    Devin Card Member

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    Very interesting thread. Id be interested in a brushless conversion kit josh!
     
  6. Devin Card

    Devin Card Member

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    Andrew! Keep us updated! I am also wondering if its worth the investment in these!
     
  7. Jesse Wilkinson

    Jesse Wilkinson New Member

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    Bill could you explain to a layman what IS a gimbal motor, or rather, what makes an outrunner suitable for gimbals?
    For example why cant those Tiger U8 100Kv be used?
    Many thanks in advance
    Jesse
     
  8. Bill Collydas

    Bill Collydas Active Member

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    Jesse,
    A gimbal motor is a motor that has been modified.
    You can use the T-U8 but you have to take it apart, remove the wiring and then rewind again with a thinner wire, a certain amount of turns to get the proper resistance,
    So, a gimbal motor is a of the self motor that has been modified for that application.
    Bill
     
  9. Chakradhar Raju

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    Now the thread is getting interesting did any one tried how many turns,thickness and resistance?
     
  10. Jesse Wilkinson

    Jesse Wilkinson New Member

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    I thought as much. Thanks for the reply.
     
  11. Jason Toth

    Jason Toth Active Member

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    They are if you rewind them :)
     
  12. Jose Luis Ocejo

    Jose Luis Ocejo Active Member

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  13. Bill Collydas

    Bill Collydas Active Member

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    Well Jose,
    It don't matter how many turns it has. A brushless gimbal motor is low on torque no matter what.
    The only way that a bgm will have a lot of torque is to go with reduction.
    So, for tilt (pitch) go direct and for roll and yaw go reduction.
    Remember on a handheld system the movements are controlled by the operator, in the air on the other hand you have to deal with wind vibration from the copter and sudden movements. My handheld is all direct drive my CS for the copter is like I said tilt=direct, roll=reduction and yaw=reduction.

    I hope this helps. don't spend your money, wait a bit, some one will come out with the proper motor.
    Now, if you can get yourself a Maxon motor with Hall sensors and a powerful controller to drive those motors then you have your self a decent system.

    Bill
     
  14. Jose Luis Ocejo

    Jose Luis Ocejo Active Member

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    Thanks Bill my understanding is that, that type of motors are brushless motors with encoders different than the ones we are experimenting here with the Alexmos or Martinez boards, then I will assume that DJi and FF gimbals are using some type of encoded motors, if so I guess its just a matter of time before we start to see someone other than DJI or FF offering gimbals or parts using this type of technology
     
  15. Bill Collydas

    Bill Collydas Active Member

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    it wont take long after FF releases the MoVI someone will copy those motors and controller with in a week.
     
  16. Mario de Roos

    Mario de Roos Member

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    Hi Bill,

    Where are that gear and motor hub from that you use for the reduction?

    Greetings,

    Mario

     
  17. Bill Collydas

    Bill Collydas Active Member

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    Hi Mario, The pinion is from SDP/SI 32T the large gear is from Cinestar the plates I made from 3mm CF.
    I use the original belt 180T. I tried different variations and I found out that I don't need the belt on the tilt.
    Bill
     

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  18. Gary Haynes

    Gary Haynes Administrator
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    Doesn't introducing a belt system bring back one of the issues with servos? The inherent chance of slop in the belt drive itself?
     
  19. Bill Collydas

    Bill Collydas Active Member

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    The belt drive system has no slop. The slop is from the gears inside the servo.
     
  20. Mario de Roos

    Mario de Roos Member

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    Thanks Bill, but what do you use for mounting the pinion on the motor?

    Mario
     

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