Aluminium tube ?

This topic contains 11 replies, has 4 voices, and was last updated by  HOFMAN Stephane 8 months, 3 weeks ago.

Viewing 12 posts - 1 through 12 (of 12 total)
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  • #28266

    HOFMAN Stephane
    Participant

    Hi everyone,
    i’m a newbie with CNC, but I have some experience with 3D printers.
    I will build a MPCNC with this size (workable dimensions) :
    X : 600mm (total size : 864 mm)
    Y : 400mm (total size : 664 mm)
    Z : 100mm (total size : 290 mm)
    Any problem with theses dimensions ?

    I live in France, and my local reseller don’t have 25mm steel tubes. But he has aluminium tubes at a very low price.
    Is it possible to use them or not for my size ?

    Thanks

    #28267

    HOFMAN Stephane
    Participant

    The FAQ says : “Steel or stainless steel only, aluminum will not work for long (high point loads from the bearings will wear in a flat spot making it a loose fit).”

    What about my size ?
    In other words, what is the max size with aluminium tube ?

    #28270

    P3DCNC
    Participant

    Pretty much any size. But use mid span supports. They can be found on Thingiverse.

    #28271

    HOFMAN Stephane
    Participant

    OK and if I want to avoid using span, is my size Ok with aluminium tube ?

    #28272

    Martin DB
    Participant

    Try to avoid aluminum tubes.

    #28273

    Ben Fillmore
    Participant

    The concern isn’t about the size of your aluminum. The problem with aluminum is that it is a very soft metal. It may seem to work okay at first, but your roller bearings will very quickly start to wear down the tubes. After that happens, no amount of adjustment or fiddling can fix it. You’ll have a wobbly, shaky, noisy, inaccurate machine.

    #28274

    HOFMAN Stephane
    Participant

    Ok I understand… It’s a bad idea, so I will turn to steel tubes.
    Your explanation should be paste ine the FAQ !
    Big thanks for the speedy answers !

    #28277

    P3DCNC
    Participant

    At that size with stainless steel 25.4mm I don’t know that you would need mid span supports. Easily added if you need them.

    #28285

    HOFMAN Stephane
    Participant

    Maybe my Z is too great : I want only drill, mill, cut with laser and knife

    #28287

    P3DCNC
    Participant

    I noticed a FAQ was added … great response time.

    #28288

    P3DCNC
    Participant
    #28296

    HOFMAN Stephane
    Participant

    Indredible !

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