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IndustryArena Forum > Mechanical Engineering > Linear and Rotary Motion > Chinese Ebay 4th axis Harmonic Drive
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  1. #13
    Junior Member
    Join Date
    Jun 2010
    Posts
    3879

    Re: Chinese Ebay 4th axis Harmonic Drive

    Hi Rey8801

    While you are at it, you might like to read this stream:
    Build Thread The Design and Construction of a 'Backlash-Free' Rotary Table

    It is about a rotary unit I built using a larger HD unit. I got into some detail about calibration and measurements.

    Cheers
    Roger

  2. #14

    Join Date
    Sep 2018
    Posts
    31

    Re: Chinese Ebay 4th axis Harmonic Drive

    yeh I am now asking all the shops selling this type if they can check their unit and see if they have the same problem. I hope by getting the reply from different sources will lead to the truth! Thanks guys. I will for sure return my "free play HD" ahahah

  3. #15

    Join Date
    Aug 2019
    Posts
    277

    Re: Chinese Ebay 4th axis Harmonic Drive

    Just show them the vid you shown us, its pretty obvious this shouldn't have shipped out at the first place. Sorry it came to you that way... f n frustrating to watch in fact.

    G'luck man.

  4. #16

    Join Date
    Sep 2018
    Posts
    31

    Re: Chinese Ebay 4th axis Harmonic Drive

    I will report her eback if I get it solved somehow. Thx

  5. #17
    Registered
    Join Date
    Mar 2012
    Posts
    64

    Re: Chinese Ebay 4th axis Harmonic Drive

    I have the same 4th axis long time ago ~4 years. Also have this problem when just bought, but not as serious as yours. The manufacturer uses old harmonic drive in it...

  6. #18

    Join Date
    Sep 2018
    Posts
    31

    Re: Chinese Ebay 4th axis Harmonic Drive

    I think that was the problem. Now I am getting a replacement and by the video the supplier sent me there is not play anymore. Fingers crossed

  7. #19
    Junior Member
    Join Date
    Jun 2010
    Posts
    3879

    Re: Chinese Ebay 4th axis Harmonic Drive

    Interesting. Criticism of 'Asian rubbish' is easy to make, but I have found that a lot of (ebay) vendors are actually quite concerned about keeping their customers happy. There have been a couple of exceptions, but some of the others have been very good with reliable stuff. CarbideChiu on ebay has given me very good service over the years.

    Cheers
    Roger

  8. #20
    Registered
    Join Date
    Jul 2010
    Posts
    139

    Re: Chinese Ebay 4th axis Harmonic Drive

    Quote Originally Posted by RCaffin View Post
    Interesting. Criticism of 'Asian rubbish' is easy to make
    Well, it's not so much being Asian rubbish... but more that we are talking about a toy... and a cheap toy at that. Try buying a small Haas rotary and see how many thousands you will have to pay.

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