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  1. #11
    Er, no they don't and no it certainly is NOT!

    https://en.wikipedia.org/wiki/Harmonic_drive

    https://en.wikipedia.org/wiki/Epicyclic_gearing

    Both have teeth, that's about it for similarity.
    Last edited by magicniner; 17-08-2017 at 05:42 PM.
    You think that's too expensive? You're not a Model Engineer are you? :D

  2. I stand corrected.
    So its a Strain wave gearing.
    Quote Originally Posted by magicniner View Post
    Er, no they don't and no it certainly is NOT!

    https://en.wikipedia.org/wiki/Harmonic_drive

    https://en.wikipedia.org/wiki/Epicyclic_gearing

    Both have teeth, that's about it for similarity.

  3. #13
    Harmonic drives are the perfect solution for high gear ratios, high torque, lightweight, and the most important, they have no backlash. Widely used in multi-axis cnc, articulated robots, etc.

    There are a lot of them on ebay, SH from Korea, the only ones at an affordable price...

    I was surprised that the Chinese claim to have 4th axis with harmonic drive... possibly used ones fitted inside..

  4. #14
    Quote Originally Posted by johngoodrich View Post
    http://www.ebay.co.uk/itm/1523042469...&ul_noapp=true

    i'm looking to machine wood only on it, no metal and maybe some plastics. do you think this will be ok. Tolerance is not too important as it will be all arty type stuff. opinions please
    I have been considering something similar for quite some time now, but can't make up my mind about it. In theory it would be very useful for me, it would save time because it would turn around the work piece automatically, but maybe the work piece would vibrate too much so it would be useless for what I am doing, so I am not sure. Never the less, there are plenty on eBay as well, shipping from Germany most of the ones I found.

    Anyway, I am interested in the subject, as well as the use of it and the experience people have.

  5. #15
    Has anyone bought one of these harmonic drive index chuck thingies? Are they any good? Is the lack of a through shaft putting you off? Who will Magicniner contradict next? So many questions, life is too short for all these questions.

  6. #16
    Quote Originally Posted by Robin Hewitt View Post
    Who will Magicniner contradict next?
    As you clearly prefer your information to be of the non-factual variety I'll leave you to it :D
    You think that's too expensive? You're not a Model Engineer are you? :D

  7. #17
    Quote Originally Posted by Robin Hewitt View Post
    Has anyone bought one of these harmonic drive index chuck thingies? Are they any good?
    I am sure they are pretty good otherwise they would not be sellable.

    Quote Originally Posted by Robin Hewitt View Post
    Is the lack of a through shaft putting you off?
    Yes. That and the fact that it is considerably more expensive.

    Quote Originally Posted by Robin Hewitt View Post
    Who will Magicniner contradict next?
    I found his comments very informative and valuable. I don't know what you see was wrong with his comments or choice of words, but I did not find them contradicting, quite the opposite. I would actually be interested in hearing more about his experience and the modifications he did, as well as how he is using it.

    Quote Originally Posted by Robin Hewitt View Post
    So many questions, life is too short for all these questions.
    ...so why did you ask the last one then? It was pretty rude and unnecessary. His comments were pretty valuable, as opposed to your last question...
    Last edited by A_Camera; 18-08-2017 at 11:59 AM.

  8. #18
    Quote Originally Posted by A_Camera View Post
    I...so why did you ask the last one then? It was pretty rude and unnecessary.
    Don't worry, he's a Yorkshireman, he's already retaliated.

  9. #19
    magicniner, do you have any photos of the mods you have done to your 4th axis. I would like to see it. from your experience with these, do you thinkit would be ok for 4th axis wood milling as is, or a bit of modding

  10. #20
    John,
    I have an early pic of the "proof of concept" I knocked up with what I had lying around,

    Click image for larger version. 

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    I've subsequently re-worked the spacer support with alternate bearings to reinstate the through capacity of the spindle, it does what I need in brass, bronze, aluminium and steel.
    I don't think it would have been up to much without the tensioner to remove backlash, without the support the stepper shaft bends if you tension the belt,
    Regards,
    Nick
    You think that's too expensive? You're not a Model Engineer are you? :D

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