I think I messed this up - ball nut?


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Thread: I think I messed this up - ball nut?

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    Default I think I messed this up - ball nut?

    My Y- axis was stopping, so I started taking stuff apart. I replaced all the basic bearing earlier this year. It was grinding a lot, so I took this thing of and some ball bearings fell out.

    Is it right that I need to replace the long shaft with a new bearing?

    This is a 3925. I can almost get three guitar bodies side by side. But not quite. I'm thinking I should consider rebuilding out to 45 or so. It looks like I'd need two longer tracks. I'm scoping it for other stuff.

    Is there a good place for parts like this?

    Chris

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    Community Moderator ger21's Avatar
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    Default Re: I think I messed this up - ball nut?

    That's ballscrew and ballscrew nut..

    Gerry

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


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    Default Re: I think I messed this up - ball nut?

    Thanks.

    So both get replaced or can I just buy a ballscrew nut?

    Quote Originally Posted by ger21 View Post
    That's ballscrew and ballscrew nut..




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    Gold Member Jim Dawson's Avatar
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    Default Re: I think I messed this up - ball nut?

    If the screw is not damaged, repacking the ball nut is not difficult, but it does take some patience. New bearing balls are available from any bearing supply. But you have to make sure you get them in the correct size.

    You can also buy a new ball nut, an example: SFU1605-3 ballscrew nut 16 mm ball screw single nut

    Jim Dawson
    Sandy, Oregon, USA


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    Default Re: I think I messed this up - ball nut?

    Perfect Thanks.

    Quote Originally Posted by Jim Dawson View Post
    If the screw is not damaged, repacking the ball nut is not difficult, but it does take some patience. New bearing balls are available from any bearing supply. But you have to make sure you get them in the correct size.

    You can also buy a new ball nut, an example: SFU1605-3 ballscrew nut 16 mm ball screw single nut




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    Default Re: I think I messed this up - ball nut?

    @ OP rebuilding it is a lot more cheaper than replacing the whole thing, that thing cost a lot of $$$ on my opinion.

    Step 1: Take out all the ball bearings and wash the hole thing with kerosene or gasoline or whatever solvent you got in your area, use a toothbrush to scrape all the gunk inside the screw nut, blow compressed air to flush everything out leaving a clean, shiny, uncontaminated and oil free ball screw nut.

    Step 2: Divide the ball bearings into 4 groups, also clean it thoroughly just like the ball screw nut, after that apply multipurpose grease inside the ball screw nut, then slowly put back the ball bearing inside the ball screw piece by piece using a magnetic screw driver, stick it on the grease you applied until all of them installed back, screw back the screw shaft and it`s done, wash it with kerosene again to take out the thick grease you put in, and use a cooking oil (thin oil) to lubricate it, thick oil tends to attract more dust particles and get your ball screw contaminated in a short period of time, at least the cooking oil is not that sticky, you can blow clean it using a compressed air (120 PSI)



    This is how you test the ball screw make sure it`s not sticking, the nut should fall free flow down the shaft backlash-free



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    Default Re: I think I messed this up - ball nut?

    The rebuild seems like it is more skill than I have. It is more patience too. Plus I have no idea where to buy the new bearings, or how to figure out the size.

    So I ordered the new one recommended. I'm pretty sure it is too small. Here are the two. The one on the right is the old one.

    I see the gray ones one amazon, but they all have the whole thing.

    Does anyone know that part number I need?

    I think I messed this up - ball nut?-img_0129-jpg



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    Gold Member Jim Dawson's Avatar
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    Default Re: I think I messed this up - ball nut?

    Without knowing what the specs (lead, pitch, diameter) are on your ball screw, it would be impossible to supply a part number. The EXAMPLE that I linked to above was not intended to be the correct nut, but rather to give you an idea of what you could buy and a possible vendor. On the other hand the two nuts in your image look pretty close from the outside. Are there any numbers on your old nut?

    Jim Dawson
    Sandy, Oregon, USA


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    Default Re: I think I messed this up - ball nut?

    In the gray spot one says 16 and one says 5. So I'd guess 16mm. The new one said T6, so I tried t5, but didn't see much.

    Do these numbers tell enough If not, how do I measure what I need too. This is a K2 machine.

    Quote Originally Posted by Jim Dawson View Post
    Without knowing what the specs (lead, pitch, diameter) are on your ball screw, it would be impossible to supply a part number. The EXAMPLE that I linked to above was not intended to be the correct nut, but rather to give you an idea of what you could buy and a possible vendor. On the other hand the two nuts in your image look pretty close from the outside. Are there any numbers on your old nut?




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    Gold Member jalessi's Avatar
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    Default Re: I think I messed this up - ball nut?

    Tool Supply on eBay has a very good selection of balls, take your time and measure one of the old ones you still have.


    Great deals from ToolSupply | eBay Stores

    See attached video's for tutorials:





    Jeff...

    Patience and perseverance have a magical effect before which difficulties disappear and obstacles vanish.


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    Gold Member Jim Dawson's Avatar
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    Default Re: I think I messed this up - ball nut?

    That could be 16mm x 5mm per turn. If that is the case, a SFU1605-3 nut might work fine. The ball screw in your first picture looks like a single start screw, so you should be good there.

    Jim Dawson
    Sandy, Oregon, USA


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    Default Re: I think I messed this up - ball nut?

    That is the one I ordered from the link that didn't fit.

    Quote Originally Posted by Jim Dawson View Post
    That could be 16mm x 5mm per turn. If that is the case, a SFU1605-3 nut might work fine. The ball screw in your first picture looks like a single start screw, so you should be good there.




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I think I messed this up - ball nut?

I think I messed this up - ball nut?