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IndustryArena Forum > MetalWorking Machines > Benchtop Machines > Anyone tried these cheap eBay 5-axis trunnions with harmonic drives?
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  1. #1
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    Anyone tried these cheap eBay 5-axis trunnions with harmonic drives?

    https://www.ebay.ca/itm/223958526107...53.m1438.l2649

    I'm tempted to take a chance on one. I'm making some very small parts which need to be cut on 4 sides plus an angled slot so indexed 5-axis cutting would save a ton of re-clamping on my 3-axis bench top mill.

    If anyone has tried this one or anything similar I would love to hear about your experience.
    Thanks,
    Leo

    Attached Thumbnails Attached Thumbnails s-l1600.jpg  

  2. #2

    Re: Anyone tried these cheap eBay 5-axis trunnions with harmonic drives?

    Curious about the accuracy and quality, please kindly share experience after you got one.
    http://cncmakers.com/cnc/controllers/CNC_Controller_System/CNC_Retrofit_Package.html

  3. #3
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    Re: Anyone tried these cheap eBay 5-axis trunnions with harmonic drives?

    Greetings,

    I wrote to the seller asking for a PDF of the Owner's Manual.

    Reply was...

    "
    Hi
    Thanks for your message .
    Sorry , the item do not come with user manual .
    We do appreciate your understanding and time.
    If you have any questions,feel free to contact us,we are always here to serve you.
    Best regards"


    While it seems a useful tool, I would look further and find a seller/vendor that will offer help should it be needed.

    Cheers,

    Dave

  4. #4

    Re: Anyone tried these cheap eBay 5-axis trunnions with harmonic drives?

    It's listed for engraving, which to me would seem to imply thats it's probably not well suited to actual 5 axis machining. Even with 100:1 reduction, the steppers don't look particularly large.

  5. #5
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    Re: Anyone tried these cheap eBay 5-axis trunnions with harmonic drives?

    If it on eBay then it is probably on Aliexpress. You might find other sellers there willing to give more information.

    The thickness of the side wall where the connector is located tells me the maximum proportion of the bearing in that wall.
    Also the construction material is aluminum, including the chuck.

    So overall if I was machining steel, I wouldn't use a cutter bigger than about .048" diameter.
    Also take careful note of the height of the unit, add your material holding to that height. That leaves little Z movement left to work with.
    And the Z height of the head will be far up to column, increasing vibration.

    Careful what you wish for.

  6. #6
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    Re: Anyone tried these cheap eBay 5-axis trunnions with harmonic drives?

    Well I've taken a chance and ordered one.

    I'm only planning to make very small parts out of brass so if it's a genuine harmonic drive mechanism on each axis I think it will meet my needs.

    I'll post again once I've got it set up.

  7. #7

    Re: Anyone tried these cheap eBay 5-axis trunnions with harmonic drives?

    I look forward to the results.

  8. #8
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    Re: Anyone tried these cheap eBay 5-axis trunnions with harmonic drives?

    In the picture it does not look as though the table rotates.
    Halfnutz

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  9. #9
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    Re: Anyone tried these cheap eBay 5-axis trunnions with harmonic drives?

    Quote Originally Posted by Halfnutz View Post
    In the picture it does not look as though the table rotates.
    Have to look at all the pictures . . . . . https://i.ebayimg.com/images/g/BnEAA...xe/s-l1600.jpg

  10. #10
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    Re: Anyone tried these cheap eBay 5-axis trunnions with harmonic drives?

    How will you do the post processing?

    You will have to take great, very extreme care in setting it up. The alignment of ALL the axis of the trunnion to the rest of the machine will have to be accurate, otherwise errors in machining will be a multiple in the error in alignment of the trunnion.

  11. #11
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    Re: Anyone tried these cheap eBay 5-axis trunnions with harmonic drives?

    It is hard to tell from the pictures how rigid it is. If you bought one off of ebay from a well established seller with a 30 day no questions asked return policy, you could check it out anyway.. Like cncuser said, the post processing and set up would be critical. It could be a lot of fun using. Let us know how it turns out
    Halfnutz

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

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