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  1. #11
    Rob,
    Re-reading I should have worked out that it wasn't the spindle motor but it was the only thing I could imagine moving on a halfway logically assembled machine :-(
    I suppose all the vendors of ball screws should have a recommended shopping list of Ball Screw, Ball Screw Supports, Ball Nut and optionally Motor Mount, Motor Coupling and Motor, with a brief explanation of how and why, the market has clearly moved to a point where there is no research prior to shopping,

    - Nick

  2. #12
    The Chinese vendor sent me a reply to an email that I sent them telling them about the issue.
    Their response was:
    "Dear friend.
    Please can you buy such a coupling to change it. The problem will be solved then. This coupling is cheap only about 3usd. Can you get it in USA local? If yes. We can refund you 10usd. Then you can buy it. If you can not get it local. We can ship you 1pcs. It will cost about 12days. Please check if ok for you.
    Waiting for your confirmation. Thanks a lot.
    Nice day."
    ___________

    I am unsure about what coupling I can buy in a hardware store to fix the issue.
    Does anyone else have any recommendations on where to get similar couplings?

    Thanks...

    Mark
    Last edited by xoneeleven; 19-04-2016 at 12:59 PM.

  3. #13
    You didnt take a look at the fixed end of that ballscrew, which is on the bottom. There are two bearings on either side of the bottom plate, secured with a 17mm locknut on the ballscrew. The top bearing near the stepper motor is the floating end.

  4. Quote Originally Posted by xoneeleven View Post
    The Chinese vendor sent me a reply to an email that I sent them telling them about the issue.
    Their response was:
    "Dear friend.
    Please can you buy such a coupling to change it. The problem will be solved then. This coupling is cheap only about 3usd. Can you get it in USA local? If yes. We can refund you 10usd. Then you can buy it. If you can not get it local. We can ship you 1pcs. It will cost about 12days. Please check if ok for you.
    Waiting for your confirmation. Thanks a lot.
    Nice day."
    ___________

    I am unsure about what coupling I can buy in a hardware store to fix the issue.
    Does anyone else have any recommendations on where to get similar couplings?

    Thanks...

    Mark
    They are talking about this type of coupling https://buildyourcnc.com/images/rigi...01-4%20200.JPG
    As we have said - this uses the stepper motor bearings to fix the position - it is not the proper solution - the Z axis leadscrew needs to be in a fixed bearing at one end and a floating bearing at the other end.

    A better compromise would be to have a collar on the top end of the leadscrew, but we would need better pictures of the leadscrew mounting arrangement to be able to advise you properly.

    Best regards,

    Rob
    Sent from my clunky old Windows 7 Machine

  5. #15
    I assume I have the same machine, and this is where the ballscrew is fixed.

    Atleast on my machine, no motor-coupling would have anything to do with it.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	lowerbearing_1.PNG 
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ID:	18233   Click image for larger version. 

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ID:	18234  
    Last edited by sinnsvak; 19-04-2016 at 06:10 PM.

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


  7. Yes, we really need to see what is going on at the lower end of the Z on the OP's machine
    Sent from my clunky old Windows 7 Machine

  8. #17
    Hello All,
    Here are some photos of the bottom of the screw, the mid point, and another of the upper section per your request.

    Thanks again for these tips and info.

    Click image for larger version. 

Name:	bottom of screw pic 1_cr.jpg 
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ID:	18237 Click image for larger version. 

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ID:	18238 Click image for larger version. 

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ID:	18239

  9. Check the bottom bearing is not loose in the plate. It just looks like a push fit and it could have gone sloppy.
    Sent from my clunky old Windows 7 Machine

  10. #19
    In the photo in post #4 there's a gap between the red buffer and the driven section of the coupling, either the ballscrew moved down or the driven section of the coupling moved down.
    If the driven section of the coupling can move down then it's not tight enough and would also slip in rotation, and because more torque is required to lift Z than lower it the axis would slowly slip down.
    If the coupling driven plate is slipping then stripping, cleaning, then reassembling with a stud & bearing fit compound may provide a temporary fix,

    - Nick

  11. #20
    I cannot see this being the problem more likely the simple options, ER11 thread damaged and not locking collet properly, material insufficiently secured if clamped at edges acrylic will lift in centre with any sort of up cut helix, wrong collett size used, whatever is causing a 3.75mm shift is gong to be measurable so measure collet protrution, relative position of ballscrew, deflection in frame or material plane with dial indicator etc and identify movement.
    Before trying to remedy a problem identify it and save a lot of unecessary speculation.

  12. The Following User Says Thank You to lucan07 For This Useful Post:


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