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  1. #1
    2x RM2005 C7 Ballscrew 1450mm length and SFU2005 ballnut complete with FK (including the lock nut) and FF mounts. Also includes a flexible motor coupler with 8mm dia bore to fit standard nema 23 shaft.

    You can consider these new as although they were fitted to my machine its never cut anything. Ideal for a 4ft axis.

    Delivery is an option but will be expensive because of the weight and length. Would prefer collection if possible.

    Bargain at 60 each or 110 for the pair. You'd normally pay 200+ for these from China not to mention the chance of VAT and import duty on top of that.

    Here's a sketch showing the exact dimensions

    Click image for larger version. 

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    And a couple of images

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    Last edited by Jonathan; 13-02-2013 at 05:49 PM. Reason: Sold

  2. If they where 2010's I would of ripped your arm off.

    I will have a think about your 2005's, and speak to the boss (wife) about it.
    "If first you don't succeed, redefine success"

  3. #3
    Hi
    I'm interested in the ballscrews and would appreciate some advice. I'm building a small machine approx 800mm x travel and 600 y travel. Gantry mass approx 20kg (+/- 2kg) with spindle. Would 2005's be up to the job?. i haven't got around to the calcs yet but for my machine I can just machine them to the right length.

    Thanks in advance for any help / advice you may be able top offer

    Cheers
    Leigh


    Quote Originally Posted by Shinobiwan View Post
    2x RM2005 C7 Ballscrew 1450mm length and SFU2005 ballnut complete with FK (including the lock nut) and FF mounts. Also includes a flexible motor coupler with 8mm dia bore to fit standard nema 23 shaft.

    You can consider these new as although they were fitted to my machine its never cut anything. Ideal for a 4ft axis.

    Delivery is an option but will be expensive because of the weight and length. Would prefer collection if possible.

    Bargain at 60 each or 110 for the pair. You'd normally pay 200+ for these from China not to mention the chance of VAT and import duty on top of that.

    Here's a sketch showing the exact dimensions

    Click image for larger version. 

Name:	ScrewDims.jpg 
Views:	326 
Size:	42.5 KB 
ID:	7785

    And a couple of images

    Click image for larger version. 

Name:	20121229_014924_hdr.jpg 
Views:	284 
Size:	130.4 KB 
ID:	7782

    Click image for larger version. 

Name:	20121229_015010_hdr.jpg 
Views:	343 
Size:	122.4 KB 
ID:	7783

    Click image for larger version. 

Name:	20121229_015049_hdr.jpg 
Views:	452 
Size:	69.6 KB 
ID:	7784

  4. #4
    Sold to the man with the hobnobs (John).

  5. #5
    Quote Originally Posted by Pheet View Post
    Hi
    I'm interested in the ballscrews and would appreciate some advice. I'm building a small machine approx 800mm x travel and 600 y travel. Gantry mass approx 20kg (+/- 2kg) with spindle. Would 2005's be up to the job?. i haven't got around to the calcs yet but for my machine I can just machine them to the right length.

    Thanks in advance for any help / advice you may be able top offer

    Cheers
    Leigh
    I know this is academic since they're sold - sorry but I'd be tempted to go for 2010.

    I'll be honest and say that I've swapped these out on my machine for 2010 as they're just too slow for cutting wood on the end of a nema 23. These small motors only run up to about 1000rpm with reasonable torque. Spinning at that speed the most you can reliably expect is about 5m/min traverse but little torque left for cutting. This is fine if your doing a lot of metal routing where your usually around 1m/min or less but for MDF like I do its just not fast enough where you need to be cutting 4-5m/min usually.

    Depends what your cutting the most really! Judging by your gantry weight its not a lot so doubt it will be for metal. If your mostly cutting wood go for 2010 or even 2020 if your using the latest digital drives and suitable motors as these have very fine resolution using realtime microstepping adjust and signal input interpolation. If its metals then 2005 or 2010 would be fine.

  6. #6
    Thanks for letting me know . . mate.

    Staff Edit: Comment removed as per the forum rule:

    What you should NOT do:


    1. Discuss or link to objectionable and/or offensive topics. This is not permitted and includes but is not limited to: things of a violent nature, pornography, sexism, racism and/or other discriminatory subjects, this includes things considered to be as a “joke”. Religious and/or political discussions or anything considered to be of the same nature are not appropriate for these forums and will be removed from public viewing.
    Last edited by Lee Roberts; 29-12-2012 at 10:36 PM. Reason: re: considered as a joke

  7. #7
    I considered buying them, for about 20 seconds.
    The only thing this size ballscrew is good for is maybe a big milling machine or lathe. For other machines, like CNC routers, the forces on the ballscrews are so low that you don't need the slight increase in stiffness gained from using a RM2005 screw, hence you're much better off sticking with 16mm ballscrews and the appropriate pitch. The price was good, but to me that's not enough to counter the poor performance you'll get on a router with these, especially since it could increase the cost of the electrical parts. Presumably John S has a big machine to convert...

    Quote Originally Posted by JAZZCNC View Post
    ( That Old bastards not about any more and he's still beating me to it.!! )
    Hmm really?

    Click image for larger version. 

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    Last edited by Jonathan; 29-12-2012 at 03:32 PM.
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  8. #8
    Quote Originally Posted by Jonathan View Post
    The only thing this size ballscrew is good for is maybe a big milling machine or lathe.
    Or for replacing a worn ballscrew on a machine of a very similar size like mine.!!!

  9. #9
    Quote Originally Posted by JAZZCNC View Post
    Or for replacing a worn ballscrew on a machine of a very similar size like mine.!!!
    Perhaps, but we both know you'd me much better off getting 1610 or 2010 for a router this size. 325 USD including postage (but not customs) gets you two RM2010-1500mm, so yes a bit more but well worth the extra money if you are swapping since you can keep the same end-machining, unlike with 1610. Wearing out the ballscrew would take some doing anyway, I gather it's generally the nuts that fail first.
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  10. #10
    Quote Originally Posted by Jonathan View Post
    The only thing this size ballscrew is good for is maybe a big milling machine or lathe. For other machines, like CNC routers, the forces on the ballscrews are so low that you don't need the slight increase in stiffness gained from using a RM2005 screw
    Its not slight when your spinning them at 1000rpm+ At 1.45m I've got a 1610 on the Y axis and it just starts to show whip at 10m/min, at 14m/min its like jelly! You won't run at these speeds of course but for cutting wood you want in the range of 4-7m/min depending on the cutter dia and flutes along with DOC. Unless of course your spinning the nut but I'd still go 2010 at those lengths anyway. The cost difference is minimal for the added peace of mind.

    Presumably John S has a big machine to convert...
    Or he's chopping them up into lots of little screws ;) More likely though is he'll put them in his cnc spares stash and leave them for a rainy day. The man has enough parts to set up a cnc factory.

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