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  1. #1
    im currently still at the planning stage for converting my centec 2 to cnc

    one major issue with converting this machine is the sheer lack of space under the table and to even squeeze a flange 1204 ballnut through requires major metal removal to both the table and ballnut
    since im not particularly happy about the amount of butchery necessary does anyone have any ideas on where to find smaller ballnuts for 8mm or 10mm screws that arn't twice the price of a 1605

    failing that, any other ideas?
    Last edited by irving2008; 09-10-2012 at 12:11 PM.

  2. #2
    1605 ballscrew is the most produced ballscrew so are the cheapest. Miniatures are harder to make and made in far less volume so expect to pay a lot more.

  3. #3
    cheers for the reply gary, i was looking at your Gten FSDD ballnuts but the links to the datasheets were only bringing me to the zapp home page


    i recon its just a tough choice of whether to butcher components to fit cheaper ballscrews or to just splash out on the more expensive miniatures

    any who...

    i thought i would post some solidworks screen prints to better describe my predicament (i know you guys love a little bit of imagery )


    the first two is the standard table and the third shows how much material would need to be removed just to fit a chopped up 1204 nut in
    Click image for larger version. 

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    here we have a 1204 nut before and after 'modification'

    Click image for larger version. 

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    just to show you the clearances involved
    Click image for larger version. 

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    100 points to the first person who finds 3 issues with the screenprints!

  4. #4
    Some of the links are not working at the moment, but you can get to all the download we have on the site in this link.
    dirLIST - Index of: home/
    including solid works files of most of the Gten nuts.
    We do have the 1205 RSW or 1204 RSW nut that are flangeless

  5. The Following User Says Thank You to Gary For This Useful Post:


  6. #5
    Quote Originally Posted by jonnydeen View Post
    100 points to the first person who finds 3 issues with the screenprints!
    Have only found 1 issue with the screenprints... Albeit a very serious one...

    Your time format displays as for example 3:43 PM when I thought the whole world had agreed to use the 24 hour format.... it should read 15:43 !

    Lol

  7. #6
    thank you gary, that link is certainly very helpful

    i want to get a bit more feedback on the subject first before i start ordering parts but i do think that zapp is the only reasonable choice for the smaller ballnuts IMO

    so....

    if anyone wants to share their thoughts or opinions, please do so or forever hold your peace

  8. #7
    Quote Originally Posted by WandrinAndy View Post
    Have only found 1 issue with the screenprints... Albeit a very serious one...

    Your time format displays as for example 3:43 PM when I thought the whole world had agreed to use the 24 hour format.... it should read 15:43 !

    Lol
    lol now thats just nit-picking

    the 3 issues are a little more difficult than that

    do you honestly think i would give away 100 imaginary points that easily????

  9. #8
    i2i's Avatar
    Lives in Cardiff, United Kingdom. Last Activity: 23-12-2016 Has been a member for 7-8 years. Has a total post count of 693. Received thanks 30 times, giving thanks to others 0 times.
    how long a ballscrew do you need?

  10. #9
    Quote Originally Posted by i2i View Post
    how long a ballscrew do you need?
    x axis is 375mm and y is 200mm

  11. #10
    The ballnuts from China are made from a fairly hard grade of steel. However I did check a RM1204 ballnut from Chai and I could file it, so you should be able to machine them.

    There are some suppliers on AliExpress with small ballscrews - it might be worth asking if they have what you need although it's a bit of a long shot.

    Could you not mount the ballscrew somewhere else, for instance to the front of the table perhaps using the convenient T-slot? It's clearly not as nice as having it under the table, since the force will be off centre and you'll need to protect it from swarf, but I don't think either of these are a big deal compared to what might happen if you mill that much out of the table. It wouldn't require modification to the machine in addition to being a lot cheaper.
    Old router build log here. New router build log here. Lathe build log here.
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