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Thread: How to put ballnut back together

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    Default How to put ballnut back together

    I have this ballscrew and nut that I got from linearmotionbearings2008. I need to grind of part of the flang on the ballnut so I took it apart because I don't want to damage the plastic parts. I thought it would be clear how to put it together once I had it apart. WRONG! I have no idea how to get this back together. It does not seem possible. Also I was very careful when taking it apart as I didn't want to lose any of the balls and it didn't seem like any balls went on the floor but now when I count them there is 50. I would have thought that there should be a multiple of 3 like 51 since there are 3 return tracks. This is a 16mm diameter with 5mm pitch. Any help would be appriciated.

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    Put the orange plugs back in and one of the wiper on one end of the nut. use the wiper and screw it and the nut over the screw until you almost cover the first plug. You can now start adding the ball back in. you need to take something small to help the ball back down into the circuit. you have to do 1 circuit at a time. it will take a little time but I have done it with the same style screw many times now.

    Jermie
    http://www.eartaker.net http://thehorticulture.net


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    I spent a couple of hours trying to put that together last night but I couldn't get more than 15 balls in the first circuit. I took another ball nut off the screw to see how many balls were in it. There was 51. I sent an e-mail to Chai and asked him how many balls there should be in an RM1605. He responded almost right away and told me there should be 51. So it looks like I lost one.

    I am going to leave this for a day or two. Lots of other things to do, and I will come back to it with a refreshed mind.



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    I gave directions for putting the balls back in one of these nuts last year for another member, it is in post 112 in this thread
    http://www.cnczone.com/forums/bencht...ew_ebay-3.html
    I was glad I did take them apart as I found a few bits of plastic in there and 2over size balls in one nut. He supplied a small bag of extra balls so there where no problems.

    Dave



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    Quote Originally Posted by Davo J View Post
    I gave directions for putting the balls back in one of these nuts last year for another member, it is in post 112 in this thread
    http://www.cnczone.com/forums/bencht...ew_ebay-3.html
    I was glad I did take them apart as I found a few bits of plastic in there and 2over size balls in one nut. He supplied a small bag of extra balls so there where no problems.

    Dave
    Thanks Dave. That is the post that I following when trying to get the balls in, but for some reason I could not get it to work. I must have read that post 15 times. I think part of the reason I am having more trouble than I should is that the ends of my ball screw are not machined yet. This makes it a little dificult to tell exactly where the thread starts when looking at the end of the screw. I will give it another go after I machine the ends of the screw.

    I also noticed that there was a good deal of dirt inside the ball nut,which I found a bit surprising. So if I gan get the procedure down I will take apart all of the screws just to clean them.



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    Quote Originally Posted by SmoggyTurnip View Post
    Thanks Dave. That is the post that I following when trying to get the balls in, but for some reason I could not get it to work. I must have read that post 15 times. I think part of the reason I am having more trouble than I should is that the ends of my ball screw are not machined yet. This makes it a little dificult to tell exactly where the thread starts when looking at the end of the screw. I will give it another go after I machine the ends of the screw.

    I also noticed that there was a good deal of dirt inside the ball nut,which I found a bit surprising. So if I gan get the procedure down I will take apart all of the screws just to clean them.
    Hi
    Sorry if the 112 post was a bit hard to understand, it is hard trying to put things into words instead of showing someone face to face, maybe I should do a video on you tube.
    You could mark the end of the screw where the thread starts with a permanent marker and it might help.
    Just drop all the balls for the bottom circuit into the nut, and then work them into the circuit. Then once that is filled do the same for the top circuit. Once you get it done a few times it will become easier.
    Once I got them in once, I took it apart again about 3 times just so I knew the procedure. Then when the question got asked in that thread I took it apart again so I could right down the procedure as I had forgotten a few things.

    Dave



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    I would love to see a video of this. I already searched youtube for one. There are several that show how to reload ballnuts that have return tubes on the outside of the nut, but I couldn't find any for the type that have the return circuit on the inside of the nut. I will probably be trying this again on the weekend.



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    SmoggyTurnip,

    I just took mine apart (RM2005) and found that both of the ballnuts I took apart dont have a multiple of 3 for the ball count. I am ordering new balls and will see how many will fit, I think 20 per circuit is probably the correct number.

    Anyway, I might attempt to video the reassembly once I get it down as I have a total of four ballnuts to complete.



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    Quote Originally Posted by small_toys View Post
    SmoggyTurnip,

    I just took mine apart (RM2005) and found that both of the ballnuts I took apart dont have a multiple of 3 for the ball count. I am ordering new balls and will see how many will fit, I think 20 per circuit is probably the correct number.
    the supplier says 51 which is 3 x 17! - more likely to loose one ball rather than 10 as you are suggesting!



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    Quote Originally Posted by kawazuki View Post
    the supplier says 51 which is 3 x 17! - more likely to loose one ball rather than 10 as you are suggesting!
    I ment 60 for the RM2005. Sorry for the confusion.

    51 for the RM1605, I have the RM2005 which is slightly larger. I did not loose any balls upon disassembly, so I now something is wrong, one screw had 53, the other had 58, clearly not a multiple of 3. I have contacted Chia, just waiting on the reply.



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    Quote Originally Posted by small_toys View Post
    I ment 60 for the RM2005. Sorry for the confusion.

    51 for the RM1605, I have the RM2005 which is slightly larger. I did not loose any balls upon disassembly, so I now something is wrong, one screw had 53, the other had 58, clearly not a multiple of 3. I have contacted Chia, just waiting on the reply.
    I am 99.9% sure that I did not lose any balls when I disasembled the screw. Chai is going to send me 100 balls free (except I have to pay $12.00 shipping)



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    I have recieved the McMaster order of 0.125" balls and have installed a total of 63 balls in the nut. Feels real smooth.
    It took about 2 minutes to install the balls, not hard at all. Camera needed to charge so will try for a video today.



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