Thread: 8 x 4 build

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  1. #11
    D.C.'s Avatar
    Lives in Birmingham, United Kingdom. Last Activity: 05-01-2016 Has been a member for 4-5 years. Has a total post count of 326. Received thanks 30 times, giving thanks to others 24 times.
    Have you a read through this build log? Lots of renderings at the start and photos of the frame later on that might help.

    http://www.mycncuk.com/threads/6619-...2060#post52060

  2. #12
    Quote Originally Posted by reefy86 View Post
    do you mean ball screws? if so then yes both sides :) using nema 34 motors and servo drivers.

    cheers

    ash
    Ok then have factored in the whip of the screws at that length etc.
    ..Clive
    The more you know, The better you know, How little you know

  3. #13
    hi clive, what do you mean have factored in the whip?

    cheers

  4. #14
    Quote Originally Posted by reefy86 View Post
    hi clive, what do you mean have factored in the whip?

    cheers
    Ball screws have a critical speed that you can reach before they start to whip I am not an expert on this but I would have thought that if you are using screws that long you might need rotating ball nuts. Do a search on here there has been plenty of talk about it.
    ..Clive
    The more you know, The better you know, How little you know

  5. #15
    i used rotating nuts, on my 8x4 build because of the whip effect Clive mentions.


    skip to about 1:15


    http://www.mycncuk.com/threads/8242-...t=wall+mounted
    Last edited by kingcreaky; 19-08-2015 at 07:55 AM.

  6. #16
    thanks guys i will take a look :)

  7. #17
    i want to hide my z axis stepper motor rather then having it stuck in the air so it requires a belt and pulley, is there a requirement to which i should aim for? more teeth the better or the opposite?

    cheers

    ash
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    Last edited by reefy86; 22-08-2015 at 02:03 AM.

  8. #18
    i recommend to brace the legs with the diagonals , not the way it is now, there is no force pushing on the braces on that orientation

    :)

  9. #19
    think this maybe my final design on the frame, what do you think?

    cheers

    ash

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  10. #20
    I would suggest you don't need the flat bar as it's not likely to add anything, where you've got the angled sections on the "feet/legs" of the frame, move those up into the rectangular spaces or add some there, they will serve you much better.

    .Me
    .Me

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