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V-slot Extrusion Tolerances

Discussion in 'General Talk' started by BDP, Aug 25, 2014.

  1. BDP

    BDP Well-Known
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    I've been slowly building up the Ox like many others, and when I got to the 20X80 extrusions, I noticed they were bowed. When placed alongside one and other with both pieces bowing outwards, I get a gap of around 2mm in the middle.
    I received three 20x40 and three 20x60 extrusions in the same shipment that were all fine (all extrusions are the same 1000mm length)

    Is this deemed within spec?
     
  2. DarkAlchemist

    DarkAlchemist Veteran
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    WOW, a 2mm "bow" would throw your drill all kinda ways out of kilter.

    If that was used for Y and only one side had that your drill would lean to one side and if both had that "bow" in precisely the same spot your drill bit would be 2mm higher than your work and if that was turned around and was a "dip" instead your drill bit would be 2mm deeper into the work.
     
  3. Mark Carew

    Mark Carew OpenBuilds Team
    Staff Member Resident Builder Builder

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    Hello, @BDP
    The Part Store Team would be better to deal with this issue, but I will do my best to help :)
    This should not be the case, but there are rare times ( such as at the end of a pull) when a bow can happen, but is not the norm. OpenBuilds staff go though all V-Slot to ensure that there are no blemishes or other issues with the rail.
    We apologize for the delay this may have caused with your OX build.
    Please send the Part Store Team an email contact@openbuildspartstore.com and they will take care of you.
    You can also contact them though the 'about us' page form as well
    http://openbuildspartstore.com/about-us/
    Hope this helps, thank you for your support and understanding.
    Mark
     
  4. DarkAlchemist

    DarkAlchemist Veteran
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    How true is this stuff? My greatest fears are dips, valleys, and hills in the stuff as that will make it a hell day in Frogtown for doing any router work with it.
     
  5. BDP

    BDP Well-Known
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    Just to update...

    The Openbuilds team sent me through 2 new replacement lengths of 20x80 vslot which runs very true. Thanks for the prompt reply and service guys!
     
  6. Rob Taylor

    Rob Taylor Veteran
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    I may just be lacking comprehension skills or being lazy, but are there datasheets on V-Slot from the manufacturer? In particular, flatness (in um/m, fingers crossed), elasticity moduli (compression/tension/flexural/whatever), bending moment of inertia, etc?

    The difference between vertically-oriented 2020, 2040 and 2080 has to be quite significant, but I don't know if any of us know exactly how much so.
     
    DesignShaper likes this.

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