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Thread: Selecting the right ball screw Size and system

  1. #25
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    Default Re: Selecting the right ball screw Size and system

    Quote Originally Posted by NIC 77 View Post
    That is quite the pinion! Obviously those are flange mount planetary reducers?

    Is this system spring loaded or just carefully aligned?

    I've never seen something like that before with the lubrication. Thanks for sharing.
    I thought it would be interesting to show what a high quality pinion setup is like, No spring loading, you can not spring load a Helical Rack, It was all aligned with an indicator, the Racks where fitted on a machined surface, straight and parallel within .001 over 12' along with the Linear rails

    Mactec54


  2. #26
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    Default Re: Selecting the right ball screw Size and system

    Hi there

    I am thankful of all you experts regarding your most helpful replies.
    It took me a while to read them all,
    I think I can conclude that the best system for over a meter long travel is the R&P systems.
    But that backlash is the most challenging issue.

    What do you think a bout Split Pinion design?
    Double pinion, well I am not so sure since apparently it is not that common, and we just do not know much about them,
    also NIC77 I agree with you on 1:5 ratio it is much better choice.
    How about the Belt driven System? would you recommend it for my 2m*4m table?

    Finally Mactec54 : Apparently your machine is single pinion with ac Servo Motor, Do you have a gear box of some sort with your servo?
    Could you briefly explain it? and if you are not spring loading it, then how do you mounted on your Rack? have you just lay it on the rack?
    Or do you some how tension mounting it on the rack?

    Regards
    johnansaro



  3. #27
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    Default Re: Selecting the right ball screw Size and system

    Quote Originally Posted by johnansaro View Post
    Hi there

    I am thankful of all you experts regarding your most helpful replies.
    It took me a while to read them all,
    I think I can conclude that the best system for over a meter long travel is the R&P systems.
    But that backlash is the most challenging issue.

    What do you think a bout Split Pinion design?
    Double pinion, well I am not so sure since apparently it is not that common, and we just do not know much about them,
    also NIC77 I agree with you on 1:5 ratio it is much better choice.
    How about the Belt driven System? would you recommend it for my 2m*4m table?

    Finally Mactec54 : Apparently your machine is single pinion with ac Servo Motor, Do you have a gear box of some sort with your servo?
    Could you briefly explain it? and if you are not spring loading it, then how do you mounted on your Rack? have you just lay it on the rack?
    Or do you some how tension mounting it on the rack?

    Regards
    johnansaro
    This machine is not mine, I just helped with the build

    Yes there are Gearboxes 10:1 on this machine, the AC Servo run up to 6,000 RPM

    The Racks are Helical Heat treated and precision Ground, every part is precisely mounted on the machine so there is no problem with backlash

    There is no spring loading, just precise alignment, you can not use any kind of spring loading device, when using a Helical Rack and Pinion

    The Racks are mounted on a machined surface, Matching the Linear Rails, that has a machined Edge for the Rack to be clamped against to get precise alignment the full 12' , the alignment of the Racks were within .001" over the 12' length

    No Belt Drive, would not be suitable for a machine this big

    Most use straight cut Racks, these you can spring load the Pinion, or use more than one Pinion to help with the backlash

    Rack and Pinion is the only worth while way at this time, even the Precision Helical Rack is cheaper than a BallScrew for this size machine, I'm working on a system for any type of router build, that will fill the void if it is successful, it is some time away before it will be for sale

    Mactec54


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Selecting the right ball screw Size and system
Selecting the right ball screw Size and system