Why would a NOS linear rail be described as "Z-axis"?

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Thread: Why would a NOS linear rail be described as "Z-axis"?

  1. #1
    CluelessCNC's Avatar
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    Default Why would a NOS linear rail be described as "Z-axis"?

    Forgive my ignorance, I'm new to linear motion rails. Try as I might, after reading a ton of literature I cannot figure out why a rail would be described by the seller as "Z-axis". Specifically, a THK KR33 series rail. Couldn't a rail like this be used in any orientation, or is there some difference in a rail from the standard models that makes it more suitable for use as the Z-axis?


    For instance, here's a completed auction for new THK KR33 rails described as Z-axis.


    https://www.ebay.com/itm/THK-KR3310A...w/301839079698



  2. #2
    Community Moderator ger21's Avatar
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    Default Re: Why would a NOS linear rail be described as "Z-axis"?

    They're just saying that it could be used as is for a Z axis.
    It's not just a linear rail, it's a complete assembly with 2 rails, bearing blocks, and probably a ballscrew.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

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


  3. #3
    Member Jim Dawson's Avatar
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    Default Re: Why would a NOS linear rail be described as "Z-axis"?

    A rail is a rail. Maybe that is what the seller decided it was for. It does look short, so might be best used for a Z axis. It could be used in any orientation.

    Jim Dawson
    Sandy, Oregon, USA


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Why would a NOS linear rail be described as "Z-axis"?

Why would a NOS linear rail be described as "Z-axis"?

Why would a NOS linear rail be described as "Z-axis"?