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  1. #11
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Last Activity: 2 Weeks Ago Has been a member for 9-10 years. Has a total post count of 1,600. Received thanks 110 times, giving thanks to others 69 times.
    Quote Originally Posted by Leadhead View Post
    When can we expect your review?
    Me? Nothing yet, need to finish Thor first.

  2. #12
    Quote Originally Posted by Chaz View Post
    Me? Nothing yet, need to finish Thor first.
    Hi! Did you ended up using hte 4th axis harmonic drive? I just got one and wired up. It looks ok but i notice the chuck has this huge play. Do you also have it? I thought it should be gapless with not backlash. I am confused. :-)

    Here the video showing it.
    https://www.youtube.com/watch?v=uSB-UlZzBjQ

    Thanks for the help!

  3. #13
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Last Activity: 2 Weeks Ago Has been a member for 9-10 years. Has a total post count of 1,600. Received thanks 110 times, giving thanks to others 69 times.
    Quote Originally Posted by Rey8801 View Post
    Hi! Did you ended up using hte 4th axis harmonic drive? I just got one and wired up. It looks ok but i notice the chuck has this huge play. Do you also have it? I thought it should be gapless with not backlash. I am confused. :-)

    Here the video showing it.
    https://www.youtube.com/watch?v=uSB-UlZzBjQ

    Thanks for the help!
    Hi, nope - didnt look at it.

  4. The Following User Says Thank You to Chaz For This Useful Post:


  5. #14
    Ah ok. Well if you will have justa minute maybe try to replicate what I have shown in the video. In my drive the front can move without turning the stepper motor. I thought harmonic should be backlash free or gapless as the seller mentioned in the product title. Thanks! :-)

  6. The Following User Says Thank You to Rey8801 For This Useful Post:


  7. #15
    Harmonic drives have very low backlash, that looks like something loose inside where it is attached to the gear, bad key-way, loose bolts ??

  8. #16
    Quote Originally Posted by johnsattuk View Post
    Harmonic drives have very low backlash, that looks like something loose inside where it is attached to the gear, bad key-way, loose bolts ??
    Not sure how it is connected inside but it is strange to me too. I might try to open it up in front. The runout is not measurable so will be really a pity if that can no be solved.

  9. #17
    Quote Originally Posted by johnsattuk View Post
    Harmonic drives have very low backlash, that looks like something loose inside where it is attached to the gear, bad key-way, loose bolts ??
    Report here as well.
    I made a video yesterday during the disassemble, just a random talk late at night, but it's useful to actually show how it is made. The backlash it's really from what I would call harmonic drive, but I am not an expert. What surprise me is that there are other users from this forum with the same drive and they claim almost ZERO backlash, so can be that I got a faulty one with maybe components out of tollerance. It seems the mesh inside the gearbox has a play before lock in place.

    https://youtu.be/qgmcX7lL5zw

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