E3d's leadscrew Motor with POM nut "wobble"

Discussion in 'Feedback' started by boldnuts, Jun 23, 2018.

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  1. boldnuts

    boldnuts Member

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    Hi guys I am after some advice regarding my recent purchasing of 2 Z axis leadscrews/motors form E3d, https://e3d-online.com/leadscrew-motor

    After installing them I found that the amount of wobble on the lead screw was horrendous so sent them back for replacement, but unfortunately the replacements are just as bad, please see video. I am having to use antiwobble mounts on the lead screws nuts it's that bad!


    Is this to be accepted as normal as they have informed me?
     
  2. Old_Tafr

    Old_Tafr Well-Known Member

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    Tried to run video this am "An error occurred. Please try again later. Tried yust now 16:24, same message.

    I guess this is the motor with the built in lead screw? Seems like a nuts idea to me as if the alignment isn't 101% perfect then it can ever be put right. In theory it is better IF it is perfect. The old-fashioned way means lots of adjustment but of course still does not compensate for an out of true lead screw. The advantage of separate parts is that you can just replace the lead screw, plus (as in the BigBox case) you have to take the whole base apart to change the motor (it is NOT a "drop-in" part. And feed it through from underneath? ................ Am I missing something here?

    Checking the separate lead screw is easy, just roll it on a surface plate of a piece of flat glass to see how out of straight it is, and use a feeler gauge to measure how out of true it is. In the built in case this test is still possible with the motor hanging off the side, but if wonky then the whole unit goes back.

    I'm sure someone also got a better make of lead screw for the discrete parts approach.
     
  3. boldnuts

    boldnuts Member

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    That's odd as the video is working for me, I will be sending them back to E3D for a full refund this week anyway.
     
  4. Old_Tafr

    Old_Tafr Well-Known Member

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    I guess you own the location where the video is stored (Google drive?) unless you share this then it will be inaccessible to anyone else.
     
  5. boldnuts

    boldnuts Member

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    Just checked the link, sharing is on
     
  6. elmoret

    elmoret Administrator

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    Looks like a bent lead screw, I'm not sure why shipping damage is something to get mad at E3D for.
     
  7. boldnuts

    boldnuts Member

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    More very disappointed as it's the second lot from them, and I did inform them about the bad packaging first time around
     
    cez likes this.
  8. Old_Tafr

    Old_Tafr Well-Known Member

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    Video still don't work, I guess it will work for you as you own the place it's stored in.
     
  9. cez

    cez Well-Known Member

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    I had the same issue, one was straight one bent. I had an awful time getting my money back. They lost my parcel, found it after a week then returned just the base cost (no VAT) in error. The whole transaction was a let down.
     
  10. jfb

    jfb Well-Known Member

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    Video works for me. Looks like a slightly bent leadscrew.

    If I remember right, the better leadscrew @Old_Tafr mentioned had to be specified with better than normal industry standard tolerances, as the industry standard for manufacture of the screws isn't necessarily all that straight. The details are somewhere on the forum (ephbox maybe?).

    Perhaps one day I'll give this a try instead of leadscrews.... https://drmrehorst.blogspot.com/2017/07/ultra-megamax-dominator-z-axis-design.html
     

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